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/*
*
* * Copyright 2015 Skymind,Inc.
* *
* * Licensed under the Apache License, Version 2.0 (the "License");
* * you may not use this file except in compliance with the License.
* * You may obtain a copy of the License at
* *
* * http://www.apache.org/licenses/LICENSE-2.0
* *
* * Unless required by applicable law or agreed to in writing, software
* * distributed under the License is distributed on an "AS IS" BASIS,
* * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* * See the License for the specific language governing permissions and
* * limitations under the License.
*
*
*/
package org.nd4j.linalg.api.ndarray;
import com.google.common.primitives.Ints;
import org.nd4j.linalg.api.blas.BlasBufferUtil;
import org.nd4j.linalg.api.buffer.DataBuffer;
import org.nd4j.linalg.api.complex.IComplexNDArray;
import org.nd4j.linalg.api.complex.IComplexNumber;
import org.nd4j.linalg.api.instrumentation.Instrumentation;
import org.nd4j.linalg.api.iter.FirstAxisIterator;
import org.nd4j.linalg.api.ops.impl.accum.Max;
import org.nd4j.linalg.api.ops.impl.accum.*;
import org.nd4j.linalg.api.ops.impl.accum.Min;
import org.nd4j.linalg.api.ops.impl.scalar.*;
import org.nd4j.linalg.api.ops.impl.scalar.comparison.ScalarEquals;
import org.nd4j.linalg.api.ops.impl.scalar.comparison.ScalarGreaterThan;
import org.nd4j.linalg.api.ops.impl.scalar.comparison.ScalarLessThan;
import org.nd4j.linalg.api.ops.impl.scalar.comparison.ScalarNotEquals;
import org.nd4j.linalg.api.ops.impl.transforms.*;
import org.nd4j.linalg.api.ops.impl.transforms.arithmetic.AddOp;
import org.nd4j.linalg.api.ops.impl.transforms.arithmetic.DivOp;
import org.nd4j.linalg.api.ops.impl.transforms.arithmetic.MulOp;
import org.nd4j.linalg.api.ops.impl.transforms.arithmetic.SubOp;
import org.nd4j.linalg.api.ops.impl.transforms.comparison.*;
import org.nd4j.linalg.api.ops.impl.broadcast.*;
import org.nd4j.linalg.factory.Nd4j;
import org.nd4j.linalg.indexing.*;
import org.nd4j.linalg.indexing.conditions.Condition;
import org.nd4j.linalg.string.NDArrayStrings;
import org.nd4j.linalg.util.ArrayUtil;
import org.nd4j.linalg.util.LinAlgExceptions;
import org.nd4j.linalg.util.NDArrayMath;
import org.nd4j.linalg.api.shape.Shape;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.*;
import java.lang.Iterable;
import java.nio.IntBuffer;
import java.util.*;
import java.util.Set;
import static org.nd4j.linalg.factory.Nd4j.createUninitialized;
/**
* NDArray: (think numpy)
*
* A few things of note.
*
* An NDArray can have any number of dimensions.
*
* An NDArray is accessed via strides.
*
* Strides are how to index over
* a contiguous block of data.
*
* This block of data has 2 orders(as of right now):
* fortran and c
*
* @author Adam Gibson
*/
public abstract class BaseNDArray implements INDArray, Iterable {
protected static final Logger log = LoggerFactory.getLogger(BaseNDArray.class);
/**
*
*/
private static final long serialVersionUID = 3285982317165542614L;
protected transient volatile DataBuffer shapeInformation;
protected transient volatile DataBuffer data;
protected int rows, columns;
protected long length = -1;
protected int rank;
protected boolean cleanedUp = false;
protected int numLeadingOnes = -1;
protected int numTrailingOnes = -1;
protected Boolean isVector = null;
protected Boolean isMatrix = null;
protected Boolean isScalar = null;
protected boolean isWrapAround = false;
protected int linearStride = -1;
protected boolean attemptedToFindElementWiseStride = false;
protected transient DataBuffer shape;
protected transient DataBuffer stride;
protected transient boolean compressed = false;
//Precalculate these arrays (like [3,2,1,0], [2,1,0], [1,0], [0] etc) for use in TAD, to avoid creating same int[]s over and over
private static final int[][] tadFinalPermuteDimensions;
static{
tadFinalPermuteDimensions = new int[32][0];
tadFinalPermuteDimensions[1] = new int[]{1,0}; //Edge case for 1d tensors: selectively apply to column vectors
for( int i = 2; i < 32; i++) {
tadFinalPermuteDimensions[i] = new int[i];
for( int k= i - 1, j = 0; k >= 0; k--, j++) tadFinalPermuteDimensions[i][j] = k;
}
}
public BaseNDArray() {
}
/**
* Returns true if this array is compressed, and false otherwise
* @return
*/
@Override
public boolean isCompressed() {
return compressed;
}
/**
* This method marks INDArray instance as compressed
* PLEASE NOTE: Do not use this method unless you 100% have to
*
* @param reallyCompressed
*/
@Override
public void markAsCompressed(boolean reallyCompressed) {
this.compressed = reallyCompressed;
}
/**
*
* @param buffer
*/
public BaseNDArray(DataBuffer buffer) {
this.data = buffer;
if(buffer.length() >= Integer.MAX_VALUE)
throw new IllegalArgumentException("Length of buffer can not be >= Integer.MAX_VALUE");
int[] shape = {1,(int)buffer.length()};
int[] stride = Nd4j.getStrides(shape);
this.shapeInformation = Nd4j.getShapeInfoProvider().createShapeInformation(shape,stride,0,1,Nd4j.order());
init(shape,stride);
}
/**
*
* @param buffer
* @param shape
* @param stride
* @param offset
* @param ordering
*/
public BaseNDArray(DataBuffer buffer, int[] shape, int[] stride, int offset, char ordering) {
this.data = offset > 0 ? Nd4j.createBuffer(buffer,offset,ArrayUtil.prodLong(shape)) : buffer;
this.shapeInformation = Nd4j.getShapeInfoProvider().createShapeInformation(shape,stride,offset, Shape.elementWiseStride(shape, stride, ordering == 'f'), ordering);
init(shape,stride);
// Shape.setElementWiseStride(this.shapeInfo(),Shape.elementWiseStride(shape, stride, ordering == 'f'));
}
/**
* Initialize the ndarray as a matrix
* with the given data (indices preserved)
* @param data
*/
public BaseNDArray(double[][] data) {
this(data, Nd4j.order());
}
/**
*
* @param data
* @param ordering
*/
public BaseNDArray(double[][] data, char ordering) {
this(Nd4j.createBuffer(ordering == 'c' ? ArrayUtil.flatten(data) : ArrayUtil.flattenF(data)), new int[]{data.length, data[0].length},Nd4j.getStrides(new int[]{data.length, data[0].length},ordering),0,ordering);
for (int r = 0; r < rows; r++) {
assert (data[r].length == columns);
}
/*
this.data = Nd4j.createBuffer(length);
for (int r = 0; r < rows; r++) {
for (int c = 0; c < columns; c++) {
putScalar(r, c, data[r][c]);
}
}*/
}
/**
* Create with the specified shape and buffer
*
* @param shape the shape
* @param buffer the buffer
*/
public BaseNDArray(int[] shape, DataBuffer buffer) {
this.data = buffer;
init(shape,Nd4j.getStrides(shape));
}
/**
* Create this ndarray with the given data and shape and 0 offset
*
* @param data the data to use
* @param shape the shape of the ndarray
*/
public BaseNDArray(float[] data, int[] shape, char ordering) {
this(data, shape, 0, ordering);
}
/**
* @param data the data to use
* @param shape the shape of the ndarray
* @param offset the desired offset
* @param ordering the ordering of the ndarray
*/
public BaseNDArray(float[] data, int[] shape, int offset, char ordering) {
this(data, shape, Nd4j.getStrides(shape,ordering), offset);
}
/**
* Construct an ndarray of the specified shape
* with an empty data array
*
* @param shape the shape of the ndarray
* @param stride the stride of the ndarray
* @param offset the desired offset
* @param ordering the ordering of the ndarray
*/
public BaseNDArray(int[] shape, int[] stride, int offset, char ordering) {
this(Nd4j.createBuffer(ArrayUtil.prodLong(shape)), shape, stride, offset, ordering);
}
/**
* Construct an ndarray of the specified shape.
*
* @param shape the shape of the ndarray
* @param stride the stride of the ndarray
* @param offset the desired offset
* @param ordering the ordering of the ndarray
* @param initialize Whether to initialize the INDArray. If true: initialize. If false: don't.
*/
public BaseNDArray(int[] shape, int[] stride, int offset, char ordering, boolean initialize) {
this(Nd4j.createBuffer(ArrayUtil.prodLong(shape), initialize), shape, stride, offset, ordering);
}
/**
* Create the ndarray with
* the specified shape and stride and an offset of 0
*
* @param shape the shape of the ndarray
* @param stride the stride of the ndarray
* @param ordering the ordering of the ndarray
*/
public BaseNDArray(int[] shape, int[] stride, char ordering) {
this(shape, stride, 0, ordering);
}
/**
*
* @param shape
* @param offset
* @param ordering
*/
public BaseNDArray(int[] shape, int offset, char ordering) {
this(shape, Nd4j.getStrides(shape, ordering), offset, ordering);
}
/**
* Create an ndarray
* with the given shape
* @param shape
*/
public BaseNDArray(int[] shape) {
this(shape, 0, Nd4j.order());
}
/**
* Creates a new n times mDoubleMatrix.
*
* @param newRows the number of rows (n) of the new matrix.
* @param newColumns the number of columns (m) of the new matrix.
*/
public BaseNDArray(int newRows, int newColumns, char ordering) {
this.data = Nd4j.createBuffer((long)newRows * newColumns);
int[] shape = new int[]{newRows, newColumns};
int[] stride = Nd4j.getStrides(shape,ordering);
this.shapeInformation = Nd4j.getShapeInfoProvider().createShapeInformation(shape, stride, 0, Shape.elementWiseStride(shape, stride, ordering == 'f'), ordering);
init(shape,stride);
// Shape.setElementWiseStride(this.shapeInfo(),Shape.elementWiseStride(shape, stride, ordering == 'f'));
}
/**
* Create an ndarray from the specified slices.
* This will go through and merge all of the
* data from each slice in to one ndarray
* which will then take the specified shape
*
* @param slices the slices to merge
* @param shape the shape of the ndarray
*/
public BaseNDArray(List slices, int[] shape, char ordering) {
this(slices, shape, Nd4j.getStrides(shape, ordering), ordering);
}
/**
* Create an ndarray from the specified slices.
* This will go through and merge all of the
* data from each slice in to one ndarray
* which will then take the specified shape
*
* @param slices the slices to merge
* @param shape the shape of the ndarray
*/
public BaseNDArray(List slices, int[] shape, int[] stride, char ordering) {
DataBuffer ret = slices.get(0).data().dataType() == (DataBuffer.Type.FLOAT) ?
Nd4j.createBuffer(new float[ArrayUtil.prod(shape)]) :
Nd4j.createBuffer(new double[ArrayUtil.prod(shape)]);
this.data = ret;
this.shapeInformation = Nd4j.getShapeInfoProvider().createShapeInformation(shape, stride, 0, Shape.elementWiseStride(shape, stride, ordering == 'f'), ordering);
init(shape,stride);
// Shape.setElementWiseStride(this.shapeInfo(),Shape.elementWiseStride(shape, stride, ordering == 'f'));
if(slices.get(0).isScalar()) {
for (int i = 0; i < length(); i++) {
putScalar(i, slices.get(i).getDouble(0));
}
}
else {
for (int i = 0; i < slices(); i++) {
putSlice(i, slices.get(i));
}
}
}
/**
*
* @param data
* @param shape
* @param stride
* @param ordering
*/
public BaseNDArray(float[] data, int[] shape, int[] stride, char ordering) {
this(data, shape, stride, 0, ordering);
}
/**
*
* @param data
* @param shape
* @param stride
* @param offset
* @param ordering
*/
public BaseNDArray(float[] data, int[] shape, int[] stride, int offset, char ordering) {
this.shapeInformation = Nd4j.getShapeInfoProvider().createShapeInformation(shape, stride, offset, Shape.elementWiseStride(shape, stride, ordering == 'f'), ordering);
if (data != null && data.length > 0) {
this.data = Nd4j.createBuffer(data,offset);
if (offset >= data.length)
throw new IllegalArgumentException("invalid offset: must be < data.length");
}
init(shape,stride);
// Shape.setElementWiseStride(this.shapeInfo(),Shape.elementWiseStride(shape,stride,ordering == 'f'));
}
/**
*
* @param data
* @param shape
* @param stride
* @param offset
*/
public BaseNDArray(DataBuffer data, int[] shape, int[] stride, int offset) {
this.data = Nd4j.createBuffer(data,offset,ArrayUtil.prodLong(shape));
this.shapeInformation = Nd4j.getShapeInfoProvider().createShapeInformation(shape, stride, offset, Shape.elementWiseStride(shape, stride, Nd4j.order() == 'f'), Nd4j.order());
init(shape,stride);
// Shape.setElementWiseStride(this.shapeInfo(),Shape.elementWiseStride(shape, stride, Nd4j.order() == 'f'));
}
/**
*
* @param data
* @param shape
* @param strides
*/
public BaseNDArray(int[] data, int[] shape, int[] strides) {
this(Nd4j.createBuffer(data), shape, strides);
}
/**
*
* @param data
* @param shape
*/
public BaseNDArray(DataBuffer data, int[] shape) {
this(data, shape, Nd4j.getStrides(shape, Nd4j.order()), 0, Nd4j.order());
}
/**
*
* @param buffer
* @param shape
* @param offset
*/
public BaseNDArray(DataBuffer buffer, int[] shape, int offset) {
this(Nd4j.createBuffer(buffer, offset,ArrayUtil.prodLong(shape)), shape, Nd4j.getStrides(shape), offset, Nd4j.order());
}
/**
*
* @param buffer
* @param shape
* @param ordering
*/
public BaseNDArray(DataBuffer buffer, int[] shape, char ordering) {
this(buffer, shape, Nd4j.getStrides(shape, ordering), 0, ordering);
}
/**
*
* @param data
* @param shape
* @param ordering
*/
public BaseNDArray(double[] data, int[] shape, char ordering) {
this(Nd4j.createBuffer(data), shape, ordering);
}
/**
*
* @param data
* @param shape
* @param stride
* @param offset
* @param ordering
*/
public BaseNDArray(double[] data, int[] shape, int[] stride, int offset, char ordering) {
this(Nd4j.createBuffer(data,offset), shape, stride, offset, ordering);
}
/**
*
* @param data
* @param order
*/
public BaseNDArray(float[] data, char order) {
this(Nd4j.createBuffer(data), order);
}
/**
*
* @param floatBuffer
* @param order
*/
public BaseNDArray(DataBuffer floatBuffer, char order) {
this(floatBuffer, new int[]{(int)floatBuffer.length()}, Nd4j.getStrides(new int[]{(int)floatBuffer.length()}, order), 0, order);
if(floatBuffer.length() >= Integer.MAX_VALUE)
throw new IllegalArgumentException("Length of buffer can not be >= Integer.MAX_VALUE");
}
/**
*
* @param buffer
* @param shape
* @param strides
*/
public BaseNDArray(DataBuffer buffer, int[] shape, int[] strides) {
this(buffer, shape, strides, 0, Nd4j.order());
}
/**
* Create this ndarray with the given data and shape and 0 offset
*
* @param data the data to use
* @param shape the shape of the ndarray
*/
public BaseNDArray(float[] data, int[] shape) {
this(data, shape, 0);
}
/**
*
* @param data
* @param shape
* @param offset
*/
public BaseNDArray(float[] data, int[] shape, int offset) {
this(data, shape, offset, Nd4j.order());
}
/**
* Construct an ndarray of the specified shape
* with an empty data array
*
* @param shape the shape of the ndarray
* @param stride the stride of the ndarray
* @param offset the desired offset
*/
public BaseNDArray(int[] shape, int[] stride, int offset) {
this(new float[ArrayUtil.prod(shape)], shape, stride, offset, Nd4j.order());
}
/**
* Create the ndarray with
* the specified shape and stride and an offset of 0
*
* @param shape the shape of the ndarray
* @param stride the stride of the ndarray
*/
public BaseNDArray(int[] shape, int[] stride) {
this(shape, stride, 0);
}
/**
*
* @param shape
* @param offset
*/
public BaseNDArray(int[] shape, int offset) {
this(shape, Nd4j.getStrides(shape), offset);
}
/**
*
* @param shape
* @param ordering
*/
public BaseNDArray(int[] shape, char ordering) {
this(shape, 0, ordering);
}
/**
* Creates a new n times mDoubleMatrix.
*
* @param newRows the number of rows (n) of the new matrix.
* @param newColumns the number of columns (m) of the new matrix.
*/
public BaseNDArray(int newRows, int newColumns) {
this(newRows, newColumns, Nd4j.order());
}
/**
* Create an ndarray from the specified slices.
* This will go through and merge all of the
* data from each slice in to one ndarray
* which will then take the specified shape
*
* @param slices the slices to merge
* @param shape the shape of the ndarray
*/
public BaseNDArray(List slices, int[] shape) {
this(slices, shape, Nd4j.order());
}
/**
* Create an ndarray from the specified slices.
* This will go through and merge all of the
* data from each slice in to one ndarray
* which will then take the specified shape
*
* @param slices the slices to merge
* @param shape the shape of the ndarray
*/
public BaseNDArray(List slices, int[] shape, int[] stride) {
this(slices, shape, stride, Nd4j.order());
}
/**
*
* @param data
* @param shape
* @param stride
*/
public BaseNDArray(float[] data, int[] shape, int[] stride) {
this(data, shape, stride, Nd4j.order());
}
/**
*
* @param data
* @param shape
* @param stride
* @param offset
*/
public BaseNDArray(float[] data, int[] shape, int[] stride, int offset) {
this(data, shape, stride, offset, Nd4j.order());
}
/**
*
* @param data
*/
public BaseNDArray(float[] data) {
this(Nd4j.createBuffer(data));
}
/**
* Initialize the ndarray
* with the given data
* @param data
*/
public BaseNDArray(float[][] data) {
this(data,Nd4j.order());
}
/**
*
* @param data
* @param ordering
*/
public BaseNDArray(float[][] data,char ordering) {
this(Nd4j.createBuffer(ordering == 'c' ? ArrayUtil.flatten(data) : ArrayUtil.flattenF(data)), new int[]{data.length, data[0].length},Nd4j.getStrides(new int[]{data.length, data[0].length},ordering),0,ordering);
for (int r = 0; r < rows; r++) {
assert (data[r].length == columns);
}
/*
this.data = Nd4j.createBuffer(length);
for (int r = 0; r < rows; r++) {
for (int c = 0; c < columns; c++) {
putScalar(r, c, data[r][c]);
}
}
*/
}
/**
* Constructor for stride and offset
*
* @param buffer
* @param shape
* @param offset
* @param ordering
*/
public BaseNDArray(DataBuffer buffer, int[] shape, int offset, char ordering) {
this(buffer, shape, Nd4j.getStrides(shape, ordering), offset, ordering);
}
public BaseNDArray(double[] data, int[] shape, int[] stride, int offset) {
this(Nd4j.createBuffer(data),shape,stride,offset);
}
@Override
public void setWrapAround(boolean wrapAround) {
this.isWrapAround = wrapAround;
}
@Override
public boolean isWrapAround() {
return isWrapAround;
}
/**
* Returns whether the ndarray is valid or not
* @return true if the ndarray is valid
* false otherwise
*/
public boolean isValid() {
try {
linearIndex(length() - 1);
} catch (Exception e) {
return false;
}
return true;
}
@Override
public INDArray linearViewColumnOrder() {
return this;
}
protected INDArray create(DataBuffer data,int[] shape,int offset) {
if (this instanceof IComplexNDArray)
return Nd4j.createComplex(data, shape, offset);
else
return Nd4j.create(data, shape, offset);
}
/**
* Returns a linear view reference of shape
* 1,length(ndarray)
*
* @return the linear view of this ndarray
*/
@Override
public INDArray linearView() {
return this;
}
@Override
public void resetLinearView() {
}
@Override
public int elementWiseStride() {
/*
if(Shape.elementWiseStride(shapeInfo()) < 0 && !attemptedToFindElementWiseStride) {
INDArray reshapeAttempt = Shape.newShapeNoCopy(this,new int[]{1,length()}, ordering() == 'f');
if(reshapeAttempt != null && reshapeAttempt.elementWiseStride() > 0) {
Shape.setElementWiseStride(shapeInfo(), reshapeAttempt.stride(-1));
this.shapeInformation = Nd4j.getShapeInfoProvider().createShapeInformation(shape(), stride(), offset(),reshapeAttempt.stride(-1), ordering());
}
attemptedToFindElementWiseStride = true;
}
*/
return Shape.elementWiseStride(shapeInfoDataBuffer());
}
@Override
public int elementStride() {
return 1;
}
@Override
public int majorStride() {
setLinearStride();
return stride(-1);
}
@Override
@Deprecated
public int secondaryStride() {
return majorStride();
}
@Override
public int tensorssAlongDimension(int... dimension) {
if(dimension == null || dimension.length == 0)
throw new IllegalArgumentException("Invalid input: dimensions not specified (null or length 0)");
if(dimension.length >= rank())
return 1;
for(int i = 0; i < dimension.length; i++)
if(dimension[i] < 0)
dimension[i] += rank();
int[] tensorShape = ArrayUtil.keep(shape(), dimension);
long len = ArrayUtil.prodLong(tensorShape);
if(len == 0)
throw new IllegalStateException("Illegal length found after removing index");
if(length / len >= Integer.MAX_VALUE)
throw new IllegalArgumentException("Tensors along dimension can not be >= Integer.MAX_VALUE");
return (int)(length / len);
}
@Override
public INDArray tensorAlongDimension(int index, int... dimension) {
if(dimension == null || dimension.length == 0)
throw new IllegalArgumentException("Invalid input: dimensions not specified (null or length 0)");
if(dimension.length >= rank())
return this;
for(int i = 0; i < dimension.length; i++)
if(dimension[i] < 0)
dimension[i] += rank();
Arrays.sort(dimension);
int tads = tensorssAlongDimension(dimension);
if(index >= tads)
throw new IllegalArgumentException("Illegal index " + index + " out of tads " + tads);
if(dimension.length == 1){
if(dimension[0] == 0 && isColumnVector()){
return this.transpose();
} else if(dimension[0] == 1 && isRowVector()){
return this;
}
}
int[] tensorShape = ArrayUtil.keep(shape(),dimension);
int[] reverseDimensions = ArrayUtil.reverseCopy(dimension);
int[] remove = ArrayUtil.removeIndex(ArrayUtil.range(0, rank()), dimension);
int[] newPermuteDims = Ints.concat(remove, reverseDimensions);
int[] finalPermuteDims = tadFinalPermuteDimensions[dimension.length];
INDArray permuted = permute(newPermuteDims);
int sliceIdx = NDArrayMath.sliceOffsetForTensor(index, permuted, tensorShape);
INDArray ret2 = permuted.slice(sliceIdx);
if(dimension.length == tensorShape.length && ArrayUtil.prod(tensorShape) == ret2.length()){
if(dimension.length == 1 && ret2.isRowVector()) return ret2;
return ret2.permutei(finalPermuteDims);
}
int length = ArrayUtil.prod(tensorShape);
int tensorLength = ArrayUtil.prod(tensorShape);
int offset = index * tensorLength / NDArrayMath.lengthPerSlice(ret2);
if(sliceIdx == 0 && length == NDArrayMath.lengthPerSlice(ret2)) {
ret2 = ret2.slice(offset);
if(dimension.length == 1 && ret2.isRowVector()) return ret2;
return ret2.permutei(finalPermuteDims);
}
else if(length == NDArrayMath.lengthPerSlice(ret2)) {
offset -= ret2.slices() * (offset / ret2.slices());
ret2 = ret2.slice(offset);
if(dimension.length == 1 && ret2.isRowVector()) return ret2;
return ret2.permutei(finalPermuteDims);
}
while(ret2.length() > length) {
sliceIdx = NDArrayMath.sliceOffsetForTensor(index, ret2, tensorShape);
sliceIdx -= ret2.slices() * (sliceIdx / ret2.slices());
ret2 = ret2.slice(sliceIdx);
}
if(dimension.length == 1 && ret2.isRowVector()) return ret2;
return ret2.permutei(finalPermuteDims);
}
/**
* Returns the number of possible vectors for a given dimension
*
* @param dimension the dimension to calculate the number of vectors for
* @return the number of possible vectors along a dimension
*/
@Override
public int vectorsAlongDimension(int dimension) {
if(dimension == 0 && isVector() || isRowVector())
return 1;
if(size(dimension) == 1 && !isVector()) {
for(int i = dimension; i < rank(); i++) {
if(size(i) != 1)
return vectorsAlongDimension(i);
}
return length();
}
else if(size(0) == 1 && !isVector()) {
int realDimension = rank() - getLeadingOnes();
if(length / size(realDimension) >= Integer.MAX_VALUE)
throw new IllegalArgumentException("Vectors along dimension can not be >= Integer.MAX_VALUE");
return (int)(length / size(realDimension));
}
if (dimension >= Shape.rank(shapeInformation)) {
if(length / size(Shape.rank(shapeInformation) - 1) >= Integer.MAX_VALUE)
throw new IllegalArgumentException("Vectors along dimension can not be >= Integer.MAX_VALUE");
return (int)(length / size(Shape.rank(shapeInformation) - 1));
}
if(length / size(dimension) >= Integer.MAX_VALUE)
throw new IllegalArgumentException("Vectors along dimension can not be >= Integer.MAX_VALUE");
return (int)(length / size(dimension));
}
/**
* Get the vector along a particular dimension
*
* @param index the index of the vector to get
* @param dimension the dimension to get the vector from
* @return the vector along a particular dimension
*/
@Override
public INDArray vectorAlongDimension(int index, int dimension) {
if(dimension < 0)
dimension = Shape.rank(shapeInformation) + dimension;
//return the whole thing
if(dimension == Shape.rank(shapeInformation) - 1 && size(dimension) == 1 && rank() > 2 || rank() > 2 && dimension == 0 && size(dimension) == 1) {
return this;
}
INDArray ret = tensorAlongDimension(index, dimension);
if(isMatrix() && ret.isVector() && dimension == 1 && !ret.isRowVector())
return ret.reshape(ArrayUtil.reverseCopy(ret.shape()));
else if(isMatrix() && ret.isVector() && dimension == 0 && !ret.isColumnVector())
return ret.reshape(ArrayUtil.reverseCopy(ret.shape()));
return ret;
}
@Override
public void setOrder(char order) {
//Shape.setOrder(shapeInfo(),order);
this.shapeInformation = Nd4j.getShapeInfoProvider().createShapeInformation(shape(), stride(),0, elementWiseStride(), order);
}
@Override
public void setShape(int... shape) {
/*
if (1 > 0)
throw new RuntimeException("setShape() called");
DataBuffer shapeView = Shape.shapeOf(shapeInformation);
for(int i = 0; i < shape.length; i++) {
shapeView.put(i,shape[i]);
}
*/
this.shapeInformation = Nd4j.getShapeInfoProvider().createShapeInformation(shape, stride(),0, elementWiseStride(), ordering());
}
@Override
public void setStride(int[] stride) {
/* if (1 > 0)
throw new RuntimeException("setStride() called");
DataBuffer strideView = Shape.stride(shapeInformation);
for(int i = 0; i < stride.length; i++)
strideView.put(i,stride[i]);
*/
this.shapeInformation = Nd4j.getShapeInfoProvider().createShapeInformation(shape(), stride,0, elementWiseStride(), ordering());
}
/**
* Cumulative sum along a dimension
*
* @param dimension the dimension to perform cumulative sum along
* @return the cumulative sum along the specified dimension
*/
@Override
public INDArray cumsumi(int dimension) {
if (isVector()) {
double s = 0.0;
for (int i = 0; i < length; i++) {
s += getDouble(i);
putScalar(i, s);
}
}
else if (dimension == Integer.MAX_VALUE) {
INDArray flattened = ravel();
double prevVal = flattened.getDouble(0);
for (int i = 1; i < flattened.length(); i++) {
double d = prevVal + flattened.getDouble(i);
flattened.putScalar(i, d);
prevVal = d;
}
return flattened;
} else {
for (int i = 0; i < vectorsAlongDimension(dimension); i++) {
INDArray vec = vectorAlongDimension(i, dimension);
vec.cumsumi(0);
}
}
return this;
}
@Override
public Number normmaxNumber() {
return normmax(Integer.MAX_VALUE).getDouble(0);
}
@Override
public IComplexNumber normmaxComplex() {
throw new UnsupportedOperationException();
}
@Override
public Number norm2Number() {
return norm2(Integer.MAX_VALUE).getDouble(0);
}
@Override
public IComplexNumber norm2Complex() {
throw new UnsupportedOperationException();
}
@Override
public Number norm1Number() {
return norm1(Integer.MAX_VALUE).getDouble(0);
}
@Override
public IComplexNumber norm1Complex() {
throw new UnsupportedOperationException();
}
@Override
public Number stdNumber() {
return std(Integer.MAX_VALUE).getDouble(0);
}
@Override
public IComplexNumber stdComplex() {
throw new UnsupportedOperationException();
}
@Override
public Number prodNumber() {
return prod(Integer.MAX_VALUE).getDouble(0);
}
@Override
public IComplexNumber prodComplex() {
throw new UnsupportedOperationException();
}
@Override
public Number meanNumber() {
return mean(Integer.MAX_VALUE).getDouble(0);
}
@Override
public IComplexNumber meanComplex() {
throw new UnsupportedOperationException();
}
@Override
public Number varNumber() {
return var(Integer.MAX_VALUE).getDouble(0);
}
@Override
public IComplexNumber varComplex() {
throw new UnsupportedOperationException();
}
@Override
public Number maxNumber() {
return max(Integer.MAX_VALUE).getDouble(0);
}
@Override
public IComplexNumber maxComplex() {
throw new UnsupportedOperationException();
}
@Override
public Number minNumber() {
return min(Integer.MAX_VALUE).getDouble(0);
}
@Override
public IComplexNumber minComplex() {
throw new UnsupportedOperationException();
}
@Override
public Number sumNumber() {
return sum(Integer.MAX_VALUE).getDouble(0);
}
@Override
public IComplexNumber sumComplex() {
throw new UnsupportedOperationException();
}
/**
* Cumulative sum along a dimension (in place)
*
* @param dimension the dimension to perform cumulative sum along
* @return the cumulative sum along the specified dimension
*/
@Override
public INDArray cumsum(int dimension) {
return dup().cumsumi(dimension);
}
/**
* Assign all of the elements in the given
* ndarray to this ndarray
*
* @param arr the elements to assign
* @return this
*/
@Override
public INDArray assign(final INDArray arr) {
Nd4j.getExecutioner().exec(new org.nd4j.linalg.api.ops.impl.transforms.Set(this,arr,this,length()));
return this;
}
@Override
public INDArray putScalar(int i, double value) {
if(i < 0)
i += rank();
if(isScalar()) {
data.put(i,value);
return this;
}
if(isRowVector()) {
return putScalar(0, i, value);
}
else if(isColumnVector()) {
return putScalar(i, 0, value);
}
int[] indexes = ordering() == 'c' ? Shape.ind2subC(this,i) : Shape.ind2sub(this, i);
return putScalar(indexes, value);
}
@Override
public INDArray putScalar(int i, float value) {
return putScalar(i, (double) value);
}
@Override
public INDArray putScalar(int i, int value) {
return putScalar(i, (double) value);
}
@Override
public INDArray putScalar(int[] indexes, double value) {
for(int i = 0; i < indexes.length; i++) {
if(indexes[i] < 0)
indexes[i] += rank();
}
if(indexes.length == 1){
return putScalar(indexes[0], value);
}else if(indexes.length == 2){
return putScalar(indexes[0], indexes[1], value);
}else if(indexes.length == 3){
return putScalar(indexes[0], indexes[1], indexes[2], value);
}else if(indexes.length == 4){
return putScalar(indexes[0], indexes[1], indexes[2], indexes[3], value);
}else {
long offset = Shape.getOffset(shapeInformation, indexes);
data.put(offset, value);
}
return this;
}
@Override
public INDArray putScalar(int row, int col, double value){
if(rank != 2) throw new IllegalStateException("Cannot use putScalar(int,int,double) on a rank " + rank + " INDArray");
long offset = Shape.getOffsetUnsafe(shapeInformation, row, col);
data.put(offset, value);
return this;
}
@Override
public INDArray putScalar(int dim0, int dim1, int dim2, double value){
if(rank != 3) throw new IllegalStateException("Cannot use putScalar(int,int,int,double) on a rank " + rank + " INDArray");
long offset = Shape.getOffsetUnsafe(shapeInformation, dim0, dim1, dim2);
data.put(offset, value);
return this;
}
@Override
public INDArray putScalar(int dim0, int dim1, int dim2, int dim3, double value){
if(rank != 4) throw new IllegalStateException("Cannot use putScalar(int,int,int,int,double) on a rank " + rank + " INDArray");
long offset = Shape.getOffsetUnsafe(shapeInformation, dim0, dim1, dim2, dim3);
data.put(offset, value);
return this;
}
@Override
public INDArray putScalar(int[] indexes, float value) {
return putScalar(indexes, (double) value);
}
@Override
public INDArray putScalar(int[] indexes, int value) {
return putScalar(indexes, (double) value);
}
/**
* Returns an ndarray with 1 if the element is epsilon equals
*
* @param other the number to compare
* @return a copied ndarray with the given
* binary conditions
*/
@Override
public INDArray eps(Number other) {
return dup().epsi(other);
}
/**
* Returns an ndarray with 1 if the element is epsilon equals
*
* @param other the number to compare
* @return a copied ndarray with the given
* binary conditions
*/
@Override
public INDArray epsi(Number other) {
INDArray otherArr = Nd4j.valueArrayOf(shape(),other.doubleValue());
return eps(otherArr);
}
/**
* epsilon equals than comparison:
* If the given number is less than the
* comparison number the item is 0 otherwise 1
*
* @param other the number to compare
* @return
*/
@Override
public INDArray eps(INDArray other) {
return dup().epsi(other);
}
/**
* In place epsilon equals than comparison:
* If the given number is less than the
* comparison number the item is 0 otherwise 1
*
* @param other the number to compare
* @return
*/
@Override
public INDArray epsi(INDArray other) {
Nd4j.getExecutioner().exec(new Eps(this, other, this, length()));
return this;
}
@Override
public INDArray lt(Number other) {
return dup().lti(other);
}
@Override
public INDArray lti(Number other) {
Nd4j.getExecutioner().exec(new ScalarLessThan(this, other));
return this;
}
@Override
public INDArray eq(Number other) {
return dup().eqi(other);
}
@Override
public INDArray eqi(Number other) {
Nd4j.getExecutioner().exec(new ScalarEquals(this, other));
return this;
}
@Override
public INDArray gt(Number other) {
return dup().gti(other);
}
@Override
public INDArray gti(Number other) {
Nd4j.getExecutioner().exec(new ScalarGreaterThan(this, other));
return this;
}
@Override
public INDArray lt(INDArray other) {
return dup().lti(other);
}
@Override
public INDArray lti(INDArray other) {
Nd4j.getExecutioner().exec(new LessThan(this, other, this, length()));
return this;
}
@Override
public INDArray neq(Number other) {
return dup().neqi(other);
}
@Override
public INDArray neqi(Number other) {
Nd4j.getExecutioner().exec(new ScalarNotEquals(this, other));
return this;
}
@Override
public INDArray neq(INDArray other) {
return dup().neqi(other);
}
@Override
public INDArray neqi(INDArray other) {
Nd4j.getExecutioner().exec(new NotEqualTo(this, other, this, length()));
return this;
}
@Override
public INDArray eq(INDArray other) {
return dup().eqi(other);
}
@Override
public INDArray eqi(INDArray other) {
Nd4j.getExecutioner().exec(new EqualTo(this, other, this, length()));
return this;
}
@Override
public INDArray gt(INDArray other) {
return dup().gti(other);
}
@Override
public INDArray gti(INDArray other) {
Nd4j.getExecutioner().exec(new GreaterThan(this, other, this, length()));
return this;
}
/**
* Negate each element.
*/
@Override
public INDArray neg() {
return dup().negi();
}
/**
* Negate each element (in-place).
*/
@Override
public INDArray negi() {
Nd4j.getExecutioner().exec(new Negative(this));
return this;
}
@Override
public INDArray rdiv(Number n, INDArray result) {
return dup().rdivi(n, result);
}
@Override
public INDArray rdivi(Number n, INDArray result) {
if (Double.isNaN(n.doubleValue()))
n = Nd4j.EPS_THRESHOLD;
Nd4j.getExecutioner().exec(new ScalarReverseDivision(this, null, result, result.length(), n));
if (Nd4j.ENFORCE_NUMERICAL_STABILITY)
Nd4j.clearNans(result);
return result;
}
@Override
public INDArray rsub(Number n, INDArray result) {
return dup().rsubi(n, result);
}
@Override
public INDArray rsubi(Number n, INDArray result) {
if (Double.isNaN(n.doubleValue()))
n = Nd4j.EPS_THRESHOLD;
Nd4j.getExecutioner().exec(new ScalarReverseSubtraction(this, null, result, result.length(), n));
if (Nd4j.ENFORCE_NUMERICAL_STABILITY)
Nd4j.clearNans(result);
return result;
}
@Override
public INDArray div(Number n, INDArray result) {
return dup().divi(n, result);
}
@Override
public INDArray divi(Number n, INDArray result) {
if (Double.isNaN(n.doubleValue()))
n = Nd4j.EPS_THRESHOLD;
Nd4j.getExecutioner().exec(new ScalarDivision(this, null, result, result.length(), n));
if (Nd4j.ENFORCE_NUMERICAL_STABILITY)
Nd4j.clearNans(result);
return result;
}
@Override
public INDArray mul(Number n, INDArray result) {
return dup().muli(n, result);
}
@Override
public INDArray muli(Number n, INDArray result) {
if (Double.isNaN(n.doubleValue()))
n = Nd4j.EPS_THRESHOLD;
Nd4j.getExecutioner().exec(new ScalarMultiplication(this, null, result, result.length(), n));
if (Nd4j.ENFORCE_NUMERICAL_STABILITY)
Nd4j.clearNans(result);
return result;
}
@Override
public INDArray sub(Number n, INDArray result) {
return dup().subi(n, result);
}
@Override
public INDArray subi(Number n, INDArray result) {
if (Double.isNaN(n.doubleValue()))
n = Nd4j.EPS_THRESHOLD;
Nd4j.getExecutioner().exec(new ScalarSubtraction(this, null, result, result.length(), n));
if (Nd4j.ENFORCE_NUMERICAL_STABILITY)
Nd4j.clearNans(result);
return result;
}
@Override
public INDArray add(Number n, INDArray result) {
return dup().addi(n, result);
}
@Override
public INDArray addi(Number n, INDArray result) {
if (Double.isNaN(n.doubleValue()))
n = Nd4j.EPS_THRESHOLD;
Nd4j.getExecutioner().exec(new ScalarAdd(this, null, result, result.length(), n));
return this;
}
/**
* Returns the element at the specified row/column
* This will throw an exception if the
*
* @param row the row of the element to return
* @param column the row of the element to return
* @return a scalar indarray of the element at this index
*/
@Override
public INDArray getScalar(int row, int column) {
return getScalar(new int[]{row, column});
}
@Override
public INDArray dup() {
if (this.isCompressed() && this.ordering() == Nd4j.order().charValue()) {
INDArray ret = Nd4j.createArrayFromShapeBuffer(data().dup(), this.shapeInfoDataBuffer());
ret.markAsCompressed(true);
return ret;
}
Nd4j.getCompressor().autoDecompress(this);
INDArray ret = Shape.toOffsetZeroCopy(this);
return ret;
}
@Override
public INDArray dup(char order){
if (this.isCompressed() && this.ordering() == order) {
INDArray ret = Nd4j.createArrayFromShapeBuffer(data().dup(), this.shapeInfoDataBuffer());
ret.markAsCompressed(true);
return ret;
}
Nd4j.getCompressor().autoDecompress(this);
return Shape.toOffsetZeroCopy(this, order);
}
/**
* Returns the elements at the the specified indices
*
* @param indices the indices to getScalar
* @return the array with the specified elements
*/
@Override
public int getInt(int... indices) {
return (int) getDouble(indices);
}
/**
* Returns the elements at the the specified indices
*
* @param indices the indices to get
* @return the array with the specified elements
*/
@Override
public double getDouble(int... indices) {
Nd4j.getCompressor().autoDecompress(this);
for(int i = 0; i < indices.length; i++) {
if(indices[i] < 0)
indices[i] += rank();
}
if(indices.length == 1) {
if(isRowVector())
return Shape.getDouble(this,0,indices[0]);
else if(isColumnVector())
return Shape.getDouble(this,indices[0],0);
else if(isScalar() && indices[0] == 0)
return data().getDouble(0);
else
throw new IllegalStateException("Indexes length must be > 1 for non vectors and scalars");
}
return Shape.getDouble(this, indices);
}
/**
* Returns the elements at the the specified indices
*
* @param indices the indices to get
* @return the array with the specified elements
*/
@Override
public float getFloat(int... indices) {
return (float) getDouble(indices);
}
/**
* Test whether a matrix is scalar.
*/
@Override
public boolean isScalar() {
if(isScalar != null)
return isScalar;
if (Shape.rank(shapeInformation) > 2) {
isScalar = false;
}
else if (Shape.rank(shapeInformation) == 1) {
isScalar = shapeOf().getInt(0) == 1;
}
else if (Shape.rank(shapeInformation) == 2) {
isScalar = shapeOf().getInt(0) == 1
&& shapeOf().getInt(1) == 1;
}
else
isScalar = false;
return isScalar;
}
/**
* Inserts the element at the specified index
*
* @param indices the indices to insert into
* @param element a scalar ndarray
* @return a scalar ndarray of the element at this index
*/
@Override
public INDArray put(int[] indices, INDArray element) {
if (!element.isScalar())
throw new IllegalArgumentException("Unable to insert anything but a scalar");
if(isRowVector() && indices[0] == 0 && indices.length == 2) {
int ix = Shape.offset(shapeInformation);
for (int i = 1; i < indices.length; i++)
ix += indices[i] * stride(i);
if (ix >= data.length())
throw new IllegalArgumentException("Illegal indices " + Arrays.toString(indices));
data.put(ix, element.getDouble(0));
}
else {
int ix = Shape.offset(shapeInformation);
for (int i = 0; i < indices.length; i++)
if(size(i) != 1)
ix += indices[i] * stride(i);
if (ix >= data.length())
throw new IllegalArgumentException("Illegal indices " + Arrays.toString(indices));
data.put(ix, element.getDouble(0));
}
return this;
}
/**
* Inserts the element at the specified index
*
* @param i the row insert into
* @param j the column to insert into
* @param element a scalar ndarray
* @return a scalar ndarray of the element at this index
*/
@Override
public INDArray put(int i, int j, INDArray element) {
return put(new int[]{i, j}, element);
}
/**
* Inserts the element at the specified index
*
* @param i the row insert into
* @param j the column to insert into
* @param element a scalar ndarray
* @return a scalar ndarray of the element at this index
*/
@Override
public INDArray put(int i, int j, Number element) {
return putScalar(new int[]{i, j}, element.doubleValue());
}
/**
* Assigns the given matrix (put) to the specified slice
*
* @param slice the slice to assign
* @param put the slice to put
* @return this for chainability
*/
@Override
public INDArray putSlice(int slice, INDArray put) {
if (isScalar()) {
assert put.isScalar() : "Invalid dimension. Can only insert a scalar in to another scalar";
put(0, put.getScalar(0));
return this;
} else if (isVector()) {
assert put.isScalar() || put.isVector() &&
put.length() == length() : "Invalid dimension on insertion. Can only insert scalars input vectors";
if (put.isScalar())
putScalar(slice, put.getDouble(0));
else
for (int i = 0; i < length(); i++)
putScalar(i, put.getDouble(i));
return this;
}
assertSlice(put, slice);
INDArray view = slice(slice);
if (put.length() == 1)
putScalar(slice, put.getDouble(0));
else if (put.isVector())
for (int i = 0; i < put.length(); i++)
view.putScalar(i, put.getDouble(i));
else {
assert Shape.shapeEquals(view.shape(),put.shape());
INDArray linear = view;
INDArray putLinearView = put;
for(int i = 0; i < linear.length(); i++) {
linear.putScalar(i,putLinearView.getDouble(i));
}
}
return this;
}
protected void assertSlice(INDArray put, int slice) {
assert slice <= slices() : "Invalid slice specified " + slice;
int[] sliceShape = put.shape();
if(Shape.isRowVectorShape(sliceShape)) {
return;
}
else {
int[] requiredShape = ArrayUtil.removeIndex(shape(), 0);
//no need to compare for scalar; primarily due to shapes either being [1] or length 0
if (put.isScalar())
return;
if(isVector() && put.isVector() && put.length() < length())
return;
//edge case for column vectors
if (Shape.isColumnVectorShape(sliceShape))
return;
if(!Shape.shapeEquals(sliceShape, requiredShape) && !Shape.isRowVectorShape(requiredShape) && !Shape.isRowVectorShape(sliceShape))
throw new IllegalStateException(String.format("Invalid shape size of %s . Should have been %s "
, Arrays.toString(sliceShape), Arrays.toString(requiredShape)));
}
}
/**
* Returns true if this ndarray is 2d
* or 3d with a singleton element
*
* @return true if the element is a matrix, false otherwise
*/
public boolean isMatrix() {
if(isMatrix != null)
return isMatrix;
isMatrix = (rank == 2 && (size(0) != 1 && size(1) != 1));
return isMatrix;
}
@Override
public int index(int row, int column) {
if (!isMatrix()) {
if (isColumnVector()) {
int idx = linearIndex(row);
return idx;
} else if (isRowVector()) {
int idx = linearIndex(column);
return idx;
}
else
throw new IllegalStateException("Unable to get row/column from a non matrix");
}
return Shape.offset(shapeInformation) + (row * stride(0) + column * stride(1));
}
protected INDArray newShape(int[] newShape, char ordering) {
return create(data(), newShape, stride(), Shape.offset(shapeInformation));
}
protected INDArray create(DataBuffer data, int[] newShape, int[] newStrides, int offset, char ordering) {
if (this instanceof IComplexNDArray)
return Nd4j.createComplex(data, newShape, newStrides, offset, ordering);
else
return Nd4j.create(data, newShape, newStrides, offset, ordering);
}
protected INDArray create(DataBuffer data, int[] newShape, int[] newStrides, int offset) {
if (this instanceof IComplexNDArray)
return Nd4j.createComplex(data, newShape, newStrides, offset);
else
return Nd4j.create(data, newShape, newStrides, offset);
}
protected INDArray create(int[] shape) {
if (this instanceof IComplexNDArray)
return Nd4j.createComplex(shape, getStrides(shape, Nd4j.order()), 0);
else
return Nd4j.create(shape, getStrides(shape, Nd4j.order()), 0);
}
protected INDArray create(int[] shape,int[] strides,int offset) {
if (this instanceof IComplexNDArray)
return Nd4j.createComplex(shape, strides, offset);
else
return Nd4j.create(shape, strides, offset);
}
protected int[] getStrides(int[] shape,char ordering) {
return Nd4j.getStrides(shape, ordering);
}
/**
* Returns the squared (Euclidean) distance.
*/
@Override
public double squaredDistance(INDArray other) {
double sd = 0.0;
for (int i = 0; i < length; i++) {
double d = getDouble(i) - other.getDouble(i);
sd += d * d;
}
return sd;
}
/**
* Returns the (euclidean) distance.
*/
@Override
public double distance2(INDArray other) {
return Math.sqrt(squaredDistance(other));
}
/**
* Returns the (1-norm) distance.
*/
@Override
public double distance1(INDArray other) {
return other.sub(this).sum(Integer.MAX_VALUE).getDouble(0);
}
@Override
public INDArray put(INDArrayIndex[] indices, INDArray element) {
if (indices[0] instanceof SpecifiedIndex && element.isVector()) {
indices[0].reset();
int cnt = 0;
while(indices[0].hasNext()) {
int idx = indices[0].next();
putScalar(idx, element.getDouble(cnt));
cnt++;
}
return this;
} else {
return get(indices).assign(element);
}
}
@Override
public INDArray put(INDArrayIndex[] indices, Number element) {
INDArray get = get(indices);
for(int i = 0; i < get.length(); i++)
get.putScalar(i,element.doubleValue());
return this;
}
/**
* Mainly here for people coming from numpy.
* This is equivalent to a call to permute
*
* @param dimension the dimension to swap
* @param with the one to swap it with
* @return the swapped axes view
*/
@Override
public INDArray swapAxes(int dimension, int with) {
int[] shape = ArrayUtil.range(0, shape().length);
shape[dimension] = with;
shape[with] = dimension;
return permute(shape);
}
@Override
public boolean isView() {
return Shape.offset(shapeInformation) > 0 || length() < data().length() || data().originalDataBuffer() != null;
}
@Override
public DataBuffer data() {
return data;
}
@Override
public void setData(DataBuffer data) {
this.data = data;
}
/**
* Number of slices: aka shape[0]
*
* @return the number of slices
* for this nd array
*/
@Override
public int slices() {
if(isRowVector())
return length();
return size(0);
}
@Override
public INDArray subArray(ShapeOffsetResolution resolution) {
int[] offsets = resolution.getOffsets();
int[] shape = resolution.getShapes();
int[] stride = resolution.getStrides();
if(offset() + resolution.getOffset() >= Integer.MAX_VALUE)
throw new IllegalArgumentException("Offset of array can not be >= Integer.MAX_VALUE");
int offset = (int)(offset() + resolution.getOffset());
int n = shape.length;
if (shape.length < 1)
return create(Nd4j.createBuffer(shape));
if (offsets.length != n)
throw new IllegalArgumentException("Invalid offset " + Arrays.toString(offsets));
if (stride.length != n)
throw new IllegalArgumentException("Invalid stride " + Arrays.toString(stride));
if (shape.length == rank() && Shape.contentEquals(shape, shapeOf())) {
if (ArrayUtil.isZero(offsets)) {
return this;
} else {
throw new IllegalArgumentException("Invalid subArray offsets");
}
}
return create(
data
, Arrays.copyOf(shape, shape.length)
, stride
, offset, ordering()
);
}
@Override
public INDArray subArray(int[] offsets, int[] shape, int[] stride) {
int n = shape.length;
if (shape.length < 1)
return create(Nd4j.createBuffer(shape));
if (offsets.length != n)
throw new IllegalArgumentException("Invalid offset " + Arrays.toString(offsets));
if (stride.length != n)
throw new IllegalArgumentException("Invalid stride " + Arrays.toString(stride));
if (Shape.contentEquals(shape,shapeOf())) {
if (ArrayUtil.isZero(offsets)) {
return this;
} else {
throw new IllegalArgumentException("Invalid subArray offsets");
}
}
int[] dotProductOffsets = offsets;
int[] dotProductStride = stride;
int offset = Shape.offset(shapeInfo()) + NDArrayIndex.offset(dotProductStride, dotProductOffsets);
if (offset >= data().length())
offset = ArrayUtil.sum(offsets);
return create(
data
, Arrays.copyOf(shape, shape.length)
, stride
, offset, ordering()
);
}
protected INDArray create(DataBuffer buffer) {
return Nd4j.create(buffer);
}
@Override
public INDArray cond(Condition condition) {
return dup().condi(condition);
}
@Override
public INDArray condi(Condition condition) {
INDArray linear = this;
for (int i = 0; i < length(); i++) {
boolean met = condition.apply(linear.getDouble(i));
linear.putScalar(i, met ? 1 : 0);
}
return this;
}
protected void init(int[] shape,int[] stride) {
if (shape.length == 1) {
rows = 1;
columns = shape[0];
}
else if (this.shape().length == 2) {
rows = shape[0];
columns = shape[1];
}
//default row vector
if (shape.length == 1) {
init(new int[]{1,shape[0]},new int[]{1,stride[0]});
}
//null character
if (ordering() == '\u0000') {
Shape.setOrder(shapeInfo(), Nd4j.order());
throw new IllegalStateException("setOrder() shouldn't ever happen here");
}
this.length = ArrayUtil.prodLong(shape);
rank = shape.length;
// TODO: this, probably, may be reconsidered and removed
if (this.elementWiseStride() == -1 && !attemptedToFindElementWiseStride) {
//log.info("Calling to computeEWS");
INDArray reshapeAttempt = Shape.newShapeNoCopy(this,new int[]{1,this.length()}, Nd4j.order() == 'f');
if (reshapeAttempt != null) {
//log.info("Got new EWS: " + reshapeAttempt.elementWiseStride());
this.shapeInformation = Nd4j.getShapeInfoProvider().createShapeInformation(this.shape(), this.stride(), this.offset(), reshapeAttempt.elementWiseStride(), ordering());
}
attemptedToFindElementWiseStride = true;
}
}
@Override
public INDArray getScalar(int i) {
return Nd4j.scalar(getDouble(i));
}
/**
* Do a row wise op (a,s,m,d)
* a : add
* s : subtract
* m : multiply
* d : divide
* h : reverse subtraction
* t : reverse division
*
* @param columnVector the column vector
* @param operation the operation
* @return
*/
protected INDArray doColumnWise(INDArray columnVector, char operation) {
//Input validation: require (a) columnVector to actually be a column vector, and (b) this.size(0) to match columnVector.size(0)
if(!columnVector.isColumnVector() || this.size(0) != columnVector.size(0)){
throw new IllegalStateException("Mismatched shapes (shape = " + Arrays.toString(shape()) + ", row vector shape =" + Arrays.toString(columnVector.shape()) + ")");
}
if(columnVector.data().sameUnderlyingData(data()))
return doColumnWise(columnVector.dup(),operation);
if(isVector()) {
switch (operation) {
case 'a':
addi(columnVector);
break;
case 's':
subi(columnVector);
break;
case 'm':
muli(columnVector);
break;
case 'd':
divi(columnVector);
break;
case 'h':
rsubi(columnVector);
break;
case 't':
rdivi(columnVector);
break;
}
return this;
}
if (rows() == 1 && columnVector.isScalar()) {
applyScalarOp(columnVector, operation);
}
else {
applyBroadcastOp(columnVector, operation);
}
return this;
}
@Override
public boolean isCleanedUp() {
return cleanedUp;
}
@Override
public void cleanup() {
if (Nd4j.shouldInstrument)
Nd4j.getInstrumentation().log(this, Instrumentation.DESTROYED);
cleanedUp = true;
}
/**
* Do a row wise op (a,s,m,d)
* a : add
* s : subtract
* m : multiply
* d : divide
* h : reverse subtraction
* t : reverse division
*
* @param rowVector the row vector
* @param operation the operation
* @return
*/
protected INDArray doRowWise(final INDArray rowVector, final char operation) {
//Input validation: require (a) rowVector to actually be a row vector, and (b) this.size(1) to match rowVector.size(1)
if(!rowVector.isRowVector() || this.size(1) != rowVector.size(1)){
throw new IllegalStateException("Mismatched shapes (shape = " + Arrays.toString(shape()) + ", row vector shape =" + Arrays.toString(rowVector.shape()) + ")");
}
if(rowVector.data().sameUnderlyingData(data()))
return doRowWise(rowVector.dup(),operation);
if(isVector()) {
switch (operation) {
case 'a':
addi(rowVector);
break;
case 's':
subi(rowVector);
break;
case 'm':
muli(rowVector);
break;
case 'd':
divi(rowVector);
break;
case 'h':
rsubi(rowVector);
break;
case 't':
rdivi(rowVector);
break;
}
return this;
}
if (rank() == 2 && columns() == 1 && rowVector.isScalar()) {
if (this instanceof IComplexNDArray) {
applyScalarOp(rowVector, operation);
}
}
else {
applyBroadcastOp(rowVector, operation);
}
return this;
}
private void applyBroadcastOp(INDArray vector, final char operation) {
int alongDimension = Shape.isRowVectorShape(vector.shape()) ? 1 : 0;
// FIXME: probably this is wrong, because strict equality is always false in current DataBuffer mechanics
if(this.data() == vector.data())
vector = vector.dup();
switch(operation) {
case 'a':
Nd4j.getExecutioner().exec(new BroadcastAddOp(this, vector, this, alongDimension),alongDimension);
return;
case 's':
Nd4j.getExecutioner().exec(new BroadcastSubOp(this, vector, this,alongDimension),alongDimension);
return;
case 'm':
Nd4j.getExecutioner().exec(new BroadcastMulOp(this, vector, this, alongDimension),alongDimension);
return;
case 'd':
Nd4j.getExecutioner().exec(new BroadcastDivOp(this, vector, this, alongDimension),alongDimension);
return;
case 'h':
Nd4j.getExecutioner().exec(new BroadcastRSubOp(this, vector, this, alongDimension),alongDimension);
return;
case 't':
Nd4j.getExecutioner().exec(new BroadcastRDivOp(this, vector, this, alongDimension),alongDimension);
return;
case 'p':
Nd4j.getExecutioner().exec(new BroadcastCopyOp(this, vector, this, alongDimension),alongDimension);
return;
default:
throw new UnsupportedOperationException("Unknown operation: " + operation);
}
}
private void applyScalarOp(INDArray vector,char operation) {
if(this instanceof IComplexNDArray) {
IComplexNDArray row = (IComplexNDArray) vector;
switch (operation) {
case 'a':
addi(row.getComplex(0));
break;
case 's':
subi(row.getComplex(0));
break;
case 'm':
muli(row.getComplex(0));
break;
case 'd':
divi(row.getComplex(0));
break;
case 'h':
rsubi(row.getComplex(0));
break;
case 't':
rdivi(row.getComplex(0));
break;
}
}
else {
switch (operation) {
case 'a':
addi(vector.getDouble(0));
break;
case 's':
subi(vector.getDouble(0));
break;
case 'm':
muli(vector.getDouble(0));
break;
case 'd':
divi(vector.getDouble(0));
break;
case 'h':
rsubi(vector.getDouble(0));
break;
case 't':
rdivi(vector.getDouble(0));
break;
}
}
}
protected DataBuffer shapeOf() {
if(shape == null)
shape = Shape.shapeOf(shapeInfoDataBuffer());
return shape;
}
protected DataBuffer strideOf() {
if(stride == null)
stride = Shape.stride(shapeInfoDataBuffer());
return stride;
}
@Override
public int stride(int dimension) {
int rank = Shape.rank(shapeInformation);
if(dimension < 0)
return strideOf().getInt(dimension + rank);
return strideOf().getInt(dimension);
}
@Override
public INDArray rdiviColumnVector(INDArray columnVector) {
return doColumnWise(columnVector, 't');
}
@Override
public INDArray rdivColumnVector(INDArray columnVector) {
return dup().rdiviColumnVector(columnVector);
}
@Override
public INDArray rdiviRowVector(INDArray rowVector) {
return doRowWise(rowVector, 't');
}
@Override
public INDArray rdivRowVector(INDArray rowVector) {
return dup().rdiviRowVector(rowVector);
}
@Override
public INDArray rsubiColumnVector(INDArray columnVector) {
return doColumnWise(columnVector, 'h');
}
@Override
public INDArray rsubColumnVector(INDArray columnVector) {
return dup().rsubiColumnVector(columnVector);
}
@Override
public INDArray rsubiRowVector(INDArray rowVector) {
return doRowWise(rowVector, 'h');
}
@Override
public INDArray rsubRowVector(INDArray rowVector) {
return dup().rsubiRowVector(rowVector);
}
/**
* Inserts the element at the specified index
*
* @param i the index insert into
* @param element a scalar ndarray
* @return a scalar ndarray of the element at this index
*/
@Override
public INDArray put(int i, INDArray element) {
if(!element.isScalar())
throw new IllegalArgumentException("Element must be a scalar");
return putScalar(i,element.getDouble(0));
}
/**
* In place addition of a column vector
*
* @param columnVector the column vector to add
* @return the result of the addition
*/
@Override
public INDArray diviColumnVector(INDArray columnVector) {
return doColumnWise(columnVector, 'd');
}
/**
* In place addition of a column vector
*
* @param columnVector the column vector to add
* @return the result of the addition
*/
@Override
public INDArray divColumnVector(INDArray columnVector) {
return dup().diviColumnVector(columnVector);
}
/**
* In place addition of a column vector
*
* @param rowVector the row vector to add
* @return the result of the addition
*/
@Override
public INDArray diviRowVector(INDArray rowVector) {
return doRowWise(rowVector, 'd');
}
/**
* In place addition of a column vector
*
* @param rowVector the row vector to add
* @return the result of the addition
*/
@Override
public INDArray divRowVector(INDArray rowVector) {
return dup().diviRowVector(rowVector);
}
/**
* In place addition of a column vector
*
* @param columnVector the column vector to add
* @return the result of the addition
*/
@Override
public INDArray muliColumnVector(INDArray columnVector) {
return doColumnWise(columnVector, 'm');
}
/**
* In place addition of a column vector
*
* @param columnVector the column vector to add
* @return the result of the addition
*/
@Override
public INDArray mulColumnVector(INDArray columnVector) {
return dup().muliColumnVector(columnVector);
}
/**
* In place addition of a column vector
*
* @param rowVector the row vector to add
* @return the result of the addition
*/
@Override
public INDArray muliRowVector(INDArray rowVector) {
return doRowWise(rowVector, 'm');
}
/**
* In place addition of a column vector
*
* @param rowVector the row vector to add
* @return the result of the addition
*/
@Override
public INDArray mulRowVector(INDArray rowVector) {
return dup().muliRowVector(rowVector);
}
/**
* In place addition of a column vector
*
* @param columnVector the column vector to add
* @return the result of the addition
*/
@Override
public INDArray subiColumnVector(INDArray columnVector) {
return doColumnWise(columnVector, 's');
}
/**
* In place addition of a column vector
*
* @param columnVector the column vector to add
* @return the result of the addition
*/
@Override
public INDArray subColumnVector(INDArray columnVector) {
return dup().subiColumnVector(columnVector);
}
/**
* In place addition of a column vector
*
* @param rowVector the row vector to add
* @return the result of the addition
*/
@Override
public INDArray subiRowVector(INDArray rowVector) {
return doRowWise(rowVector, 's');
}
/**
* In place addition of a column vector
*
* @param rowVector the row vector to add
* @return the result of the addition
*/
@Override
public INDArray subRowVector(INDArray rowVector) {
return dup().subiRowVector(rowVector);
}
/**
* In place addition of a column vector
*
* @param columnVector the column vector to add
* @return the result of the addition
*/
@Override
public INDArray addiColumnVector(INDArray columnVector) {
return doColumnWise(columnVector, 'a');
}
/**
* In place addition of a column vector
*
* @param columnVector the column vector to add
* @return the result of the addition
*/
@Override
public INDArray addColumnVector(INDArray columnVector) {
return dup().addiColumnVector(columnVector);
}
/**
* In place addition of a column vector
*
* @param rowVector the row vector to add
* @return the result of the addition
*/
@Override
public INDArray addiRowVector(INDArray rowVector) {
return doRowWise(rowVector, 'a');
}
/**
* In place addition of a column vector
*
* @param rowVector the row vector to add
* @return the result of the addition
*/
@Override
public INDArray addRowVector(INDArray rowVector) {
return dup().addiRowVector(rowVector);
}
/**
* Perform a copy matrix multiplication
*
* @param other the other matrix to perform matrix multiply with
* @return the result of the matrix multiplication
*/
@Override
public INDArray mmul(INDArray other) {
int[] shape = {rows(), other.columns()};
INDArray result = createUninitialized(shape,'f');
if(result.isScalar())
return Nd4j.scalar(Nd4j.getBlasWrapper().dot(this,other));
return mmuli(other, result);
}
protected INDArray create(int[] shape, char ordering) {
if (this instanceof IComplexNDArray)
return Nd4j.createComplex(shape, ordering);
else
return Nd4j.create(shape, ordering);
}
/**
* Perform an copy matrix multiplication
*
* @param other the other matrix to perform matrix multiply with
* @param result the result ndarray
* @return the result of the matrix multiplication
*/
@Override
public INDArray mmul(INDArray other, INDArray result) {
return dup().mmuli(other, result);
}
/**
* in place (element wise) division of two matrices
*
* @param other the second ndarray to divide
* @return the result of the divide
*/
@Override
public INDArray div(INDArray other) {
return dup().divi(other);
}
/**
* copy (element wise) division of two matrices
*
* @param other the second ndarray to divide
* @param result the result ndarray
* @return the result of the divide
*/
@Override
public INDArray div(INDArray other, INDArray result) {
return dup().divi(other, result);
}
/**
* copy (element wise) multiplication of two matrices
*
* @param other the second ndarray to multiply
* @return the result of the addition
*/
@Override
public INDArray mul(INDArray other) {
return dup().muli(other);
}
/**
* copy (element wise) multiplication of two matrices
*
* @param other the second ndarray to multiply
* @param result the result ndarray
* @return the result of the multiplication
*/
@Override
public INDArray mul(INDArray other, INDArray result) {
return dup().muli(other, result);
}
/**
* copy subtraction of two matrices
*
* @param other the second ndarray to subtract
* @return the result of the addition
*/
@Override
public INDArray sub(INDArray other) {
return dup().subi(other);
}
/**
* copy subtraction of two matrices
*
* @param other the second ndarray to subtract
* @param result the result ndarray
* @return the result of the subtraction
*/
@Override
public INDArray sub(INDArray other, INDArray result) {
return dup().subi(other, result);
}
/**
* copy addition of two matrices
*
* @param other the second ndarray to add
* @return the result of the addition
*/
@Override
public INDArray add(INDArray other) {
return dup().addi(other);
}
/**
* copy addition of two matrices
*
* @param other the second ndarray to add
* @param result the result ndarray
* @return the result of the addition
*/
@Override
public INDArray add(INDArray other, INDArray result) {
return dup().addi(other, result);
}
/**
* Perform an copy matrix multiplication
*
* @param other the other matrix to perform matrix multiply with
* @return the result of the matrix multiplication
*/
@Override
public INDArray mmuli(INDArray other) {
return dup().mmuli(other, this);
}
/**
* Perform an copy matrix multiplication
*
* @param other the other matrix to perform matrix multiply with
* @param result the result ndarray
* @return the result of the matrix multiplication
*/
@Override
public INDArray mmuli(INDArray other, INDArray result) {
LinAlgExceptions.assertMultiplies(this, other);
if (other.isScalar()) {
return muli(other.getDouble(0), result);
}
if (isScalar()) {
return other.muli(getDouble(0), result);
}
/* check sizes and resize if necessary */
if (result == this || result == other) {
/* actually, blas cannot do multiplications in-place. Therefore, we will fake by
* allocating a temporary object on the side and copy the result later.
*/
INDArray temp = create(result.shape(), Nd4j.getStrides(result.shape(),'f'));
temp.setOrder('f');
if (other.columns() == 1) {
Nd4j.getBlasWrapper().level2().gemv(
BlasBufferUtil.getCharForTranspose(result)
,BlasBufferUtil.getCharForTranspose(this)
,1.0
,this
,other
,0.0
,temp);
}
else {
Nd4j.getBlasWrapper().level3().gemm(
BlasBufferUtil.getCharForTranspose(result)
,BlasBufferUtil.getCharForTranspose(this)
,BlasBufferUtil.getCharForTranspose(temp)
,1.0
,this
,other
,0.0
,temp);
}
result.assign(temp);
} else {
//We require that the result array is 'f' (fortran) order
// However, user might have called mmuli with a c order array for the result
// In which case, we need to allocate a temporary f order array, and later do an assign to the real result array
boolean requiresTemp = result.ordering() == 'c';
INDArray gemmResultArr;
if(requiresTemp){
//Can use createUninitialized due to beta==0.0 parameter in gemm
gemmResultArr = Nd4j.createUninitialized(result.shape(),'f');
} else {
gemmResultArr = result;
}
if(other.columns() == 1) {
Nd4j.getBlasWrapper().level2().gemv(
ordering(),
BlasBufferUtil.getCharForTranspose(other),
1.0,
this,
other,
0.0,
gemmResultArr);
}
else {
Nd4j.getBlasWrapper().level3().gemm(
ordering(),
BlasBufferUtil.getCharForTranspose(other),
BlasBufferUtil.getCharForTranspose(gemmResultArr),
1.0,
this,
other,
0.0,
gemmResultArr);
}
if(requiresTemp){
result.assign(gemmResultArr);
}
}
if (Nd4j.ENFORCE_NUMERICAL_STABILITY)
Nd4j.clearNans(result);
return result;
}
private INDArray create(int[] shape, int[] stride) {
if (this instanceof IComplexNDArray)
return Nd4j.createComplex(shape, stride);
else
return Nd4j.create(shape, stride);
}
/**
* in place (element wise) division of two matrices
*
* @param other the second ndarray to divide
* @return the result of the divide
*/
@Override
public INDArray divi(INDArray other) {
return divi(other, this);
}
/**
* in place (element wise) division of two matrices
*
* @param other the second ndarray to divide
* @param result the result ndarray
* @return the result of the divide
*/
@Override
public INDArray divi(INDArray other, INDArray result) {
if (other.isScalar()) {
return divi(other.getDouble(0), result);
}
if (isScalar()) {
return other.divi(getDouble(0), result);
}
Nd4j.getExecutioner().exec(new DivOp(this, other, result, length()));
if (Nd4j.ENFORCE_NUMERICAL_STABILITY)
Nd4j.clearNans(result);
return result;
}
/**
* in place (element wise) multiplication of two matrices
*
* @param other the second ndarray to multiply
* @return the result of the addition
*/
@Override
public INDArray muli(INDArray other) {
return muli(other, this);
}
/**
* in place (element wise) multiplication of two matrices
*
* @param other the second ndarray to multiply
* @param result the result ndarray
* @return the result of the multiplication
*/
@Override
public INDArray muli(INDArray other, INDArray result) {
if (other.isScalar()) {
return muli(other.getDouble(0), result);
}
if (isScalar()) {
return other.muli(getDouble(0), result);
}
LinAlgExceptions.assertSameLength(other,result);
Nd4j.getExecutioner().exec(new MulOp(this, other, result, length()));
if (Nd4j.ENFORCE_NUMERICAL_STABILITY)
Nd4j.clearNans(result);
return result;
}
/**
* in place subtraction of two matrices
*
* @param other the second ndarray to subtract
* @return the result of the addition
*/
@Override
public INDArray subi(INDArray other) {
return subi(other, this);
}
/**
* in place subtraction of two matrices
*
* @param other the second ndarray to subtract
* @param result the result ndarray
* @return the result of the subtraction
*/
@Override
public INDArray subi(INDArray other, INDArray result) {
if (other.isScalar()) {
return subi(other.getDouble(0), result);
}
if (isScalar()) {
return other.subi(getDouble(0), result);
}
LinAlgExceptions.assertSameLength(other,result);
Nd4j.getExecutioner().exec(new SubOp(this, other, result, length()));
if (Nd4j.ENFORCE_NUMERICAL_STABILITY)
Nd4j.clearNans(result);
return result;
}
/**
* in place addition of two matrices
*
* @param other the second ndarray to add
* @return the result of the addition
*/
@Override
public INDArray addi(INDArray other) {
return addi(other, this);
}
/**
* in place addition of two matrices
*
* @param other the second ndarray to add
* @param result the result ndarray
* @return the result of the addition
*/
@Override
public INDArray addi(INDArray other, INDArray result) {
if (other.isScalar()) {
return result.addi(other.getDouble(0), result);
}
if (isScalar()) {
return other.addi(getDouble(0), result);
}
LinAlgExceptions.assertSameLength(other,result);
Nd4j.getExecutioner().exec(new AddOp(this, other, result));
if (Nd4j.ENFORCE_NUMERICAL_STABILITY)
Nd4j.clearNans(result);
return result;
}
/**
* Returns the normmax along the specified dimension
*
* @param dimension the dimension to getScalar the norm1 along
* @return the norm1 along the specified dimension
*/
@Override
public INDArray normmax(int...dimension) {
return Nd4j.getExecutioner().exec(new NormMax(this), dimension);
}
/**
* Reverse division
*
* @param other the matrix to divide from
* @return
*/
@Override
public INDArray rdiv(INDArray other) {
return dup().rdivi(other);
}
/**
* Reverse divsion (in place)
*
* @param other
* @return
*/
@Override
public INDArray rdivi(INDArray other) {
return rdivi(other, this);
}
/**
* Reverse division
*
* @param other the matrix to subtract from
* @param result the result ndarray
* @return
*/
@Override
public INDArray rdiv(INDArray other, INDArray result) {
return dup().rdivi(other, result);
}
/**
* Reverse division (in-place)
*
* @param other the other ndarray to subtract
* @param result the result ndarray
* @return the ndarray with the operation applied
*/
@Override
public INDArray rdivi(INDArray other, INDArray result) {
return other.divi(this, result);
}
/**
* Reverse subtraction
*
* @param other the matrix to subtract from
* @param result the result ndarray
* @return
*/
@Override
public INDArray rsub(INDArray other, INDArray result) {
return dup().rsubi(other, result);
}
/**
* @param other
* @return
*/
@Override
public INDArray rsub(INDArray other) {
return dup().rsubi(other);
}
/**
* @param other
* @return
*/
@Override
public INDArray rsubi(INDArray other) {
return rsubi(other, this);
}
/**
* Reverse subtraction (in-place)
*
* @param other the other ndarray to subtract
* @param result the result ndarray
* @return the ndarray with the operation applied
*/
@Override
public INDArray rsubi(INDArray other, INDArray result) {
return other.subi(this, result);
}
/**
* Set the value of the ndarray to the specified value
*
* @param value the value to assign
* @return the ndarray with the values
*/
@Override
public INDArray assign(Number value) {
Nd4j.getExecutioner().exec(new ScalarSet(this,value));
return this;
}
/**
* Assign all elements from given ndarray that are matching given condition,
* ndarray to this ndarray
*
* @param arr the elements to assign
* @param condition
* @return this
*/
@Override
public INDArray assignIf(INDArray arr, Condition condition) {
BooleanIndexing.assignIf(this, arr, condition);
return this;
}
/**
* Replaces all elements in this ndarray that are matching give condition, with corresponding elements from given array
*
* @param arr
* @param condition
* @return
*/
@Override
public INDArray replaceWhere(INDArray arr, Condition condition) {
BooleanIndexing.replaceWhere(this, arr, condition);
return this;
}
@Override
public int linearIndex(int i) {
setLinearStride();
int idx = i;
for(int j = 0; j < Shape.rank(shapeInformation) - 1; j++) {
if(size(i) == 1)
continue;
idx += i * stride(j);
}
return Shape.offset(shapeInformation) + (idx);
}
private void setLinearStride() {
if(linearStride >= 0)
return;
linearStride = ArrayUtil.prod(reshape(1,length()).stride());
}
/**
* Returns the specified slice of this matrix.
* In matlab, this would be equivalent to (given a 2 x 2 x 2):
* A(:,:,x) where x is the slice you want to return.
*
* The slice is always relative to the final dimension of the matrix.
*
* @param slice the slice to return
* @return the specified slice of this matrix
*/
@Override
public INDArray slice(int slice) {
int slices = slices();
if(slice >= slices)
throw new IllegalArgumentException("Illegal slice " + slice);
if (Shape.rank(shapeInformation) == 0) {
if(slice == 0)
return createScalarForIndex(slice,true);
else
throw new IllegalArgumentException("Can't slice a 0-d NDArray");
}
if(slice < 0)
slice += rank();
INDArrayIndex[] indexes = new INDArrayIndex[rank()];
indexes[0] = NDArrayIndex.point(slice);
for(int i = 1; i < rank(); i++) {
indexes[i] = NDArrayIndex.all();
}
return get(indexes);
}
protected INDArray createScalarForIndex(int i,boolean applyOffset) {
return create(data(), new int[]{1, 1}, new int[]{1, 1}, applyOffset ? Shape.offset(shapeInformation) + i : i);
}
protected INDArray createScalar(double d) {
return Nd4j.scalar(d);
}
@Override
public int getTrailingOnes() {
if(this.numTrailingOnes >= 0)
return this.numTrailingOnes;
int numLeadingOnes = 0;
for(int i = rank() - 1; i > 0; i--) {
if(size(i) == 1)
numLeadingOnes++;
}
this.numTrailingOnes = numLeadingOnes;
return numLeadingOnes;
}
@Override
public int getLeadingOnes() {
if(this.numLeadingOnes >= 0)
return this.numLeadingOnes;
int numLeadingOnes = 0;
for(int i = 0; i < rank(); i++) {
if(size(i) == 1)
numLeadingOnes++;
}
this.numLeadingOnes = numLeadingOnes;
return numLeadingOnes;
}
/**
* Returns the slice of this from the specified dimension
*
* @param slice the dimension to return from
* @param dimension the dimension of the slice to return
* @return the slice of this matrix from the specified dimension
* and dimension
*/
@Override
public INDArray slice(int slice, int dimension) {
int slices = size(dimension);
if(slice >= slices)
throw new IllegalArgumentException("Illegal slice " + slice);
if (Shape.rank(shapeInformation) == 0) {
if(slice == 0)
return createScalarForIndex(slice,true);
else
throw new IllegalArgumentException("Can't slice a 0-d NDArray");
}
if(slice < 0)
slice += rank();
INDArrayIndex[] indexes = new INDArrayIndex[rank()];
indexes[dimension] = NDArrayIndex.point(slice);
for(int i = 0; i < rank(); i++) {
if(i != dimension)
indexes[i] = NDArrayIndex.all();
}
return get(indexes);
}
/**
* Fetch a particular number on a multi dimensional scale.
*
* @param indexes the indexes to get a number from
* @return the number at the specified indices
*/
@Override
public INDArray getScalar(int... indexes) {
return Nd4j.scalar(getDouble(indexes));
}
@Override
public INDArray rdiv(Number n) {
return dup().rdivi(n);
}
@Override
public INDArray rdivi(Number n) {
return rdivi(n, this);
}
@Override
public INDArray rsub(Number n) {
return dup().rsubi(n);
}
@Override
public INDArray rsubi(Number n) {
return rsubi(n, this);
}
@Override
public INDArray div(Number n) {
return dup().divi(n);
}
@Override
public INDArray divi(Number n) {
return divi(n, this);
}
@Override
public INDArray mul(Number n) {
return dup().muli(n);
}
@Override
public INDArray muli(Number n) {
return muli(n, this);
}
@Override
public INDArray sub(Number n) {
return dup().subi(n);
}
@Override
public INDArray subi(Number n) {
return subi(n, this);
}
@Override
public INDArray add(Number n) {
return dup().addi(n);
}
@Override
public INDArray addi(Number n) {
return addi(n, this);
}
/**
* Replicate and tile array to fill out to the given shape
*
* @param shape the new shape of this ndarray
* @return the shape to fill out to
*/
@Override
public INDArray repmat(int[] shape) {
INDArray ret = create(shape);
INDArray linear = ret;
INDArray thisLinear = this;
int bufferIdx = 0;
for (int i = 0; i < ret.length(); i++) {
linear.putScalar(i, thisLinear.getDouble(bufferIdx));
bufferIdx++;
if (bufferIdx >= length())
bufferIdx = 0;
}
return ret;
}
@Override
public INDArray repeat(int dimension, int... repeats) {
if (dimension < 0)
dimension += rank();
if (repeats.length < rank()) {
if (dimension > 0)
repeats = Ints.concat(ArrayUtil.nTimes(rank() - repeats.length, 1), repeats);
//append rather than prepend for dimension == 0
else
repeats = Ints.concat(repeats, ArrayUtil.nTimes(rank() - repeats.length, 1));
}
int[] newShape = new int[rank()];
for (int i = 0; i < newShape.length; i++)
newShape[i] = size(i) * repeats[i];
INDArray ret = create(newShape);
//number of times to repeat each value
int repeatDelta = ArrayUtil.prod(newShape) / length();
for(int i = 0; i < tensorssAlongDimension(dimension); i++) {
INDArray thisTensor = tensorAlongDimension(i,dimension);
INDArray retTensor = ret.tensorAlongDimension(i,dimension);
int retIdx = 0;
for(int k = 0; k < thisTensor.length(); k++) {
for(int j = 0; j < repeatDelta; j++) {
retTensor.putScalar(retIdx++,thisTensor.getDouble(k));
}
}
}
return ret;
}
@Override
public INDArray repeat(int... repeats) {
if(repeats.length == 1) {
INDArray ret = create(1,length() * repeats[0]);
int idx = 0;
for(int i = 0; i < length(); i++) {
for(int j = 0; j < repeats[0]; j++) {
ret.putScalar(idx++,getDouble(i));
}
}
return ret;
}
throw new IllegalStateException("Illegal length");
}
/**
* Insert a row in to this array
* Will throw an exception if this
* ndarray is not a matrix
*
* @param row the row insert into
* @param toPut the row to insert
* @return this
*/
@Override
public INDArray putRow(int row, INDArray toPut) {
if(isRowVector() && toPut.isVector()) {
return assign(toPut);
}
return put(new INDArrayIndex[]{NDArrayIndex.point(row),NDArrayIndex.all()},toPut);
}
/**
* Insert a column in to this array
* Will throw an exception if this
* ndarray is not a matrix
*
* @param column the column to insert
* @param toPut the array to put
* @return this
*/
@Override
public INDArray putColumn(int column, INDArray toPut) {
if(isColumnVector() && toPut.isVector()) {
return assign(toPut);
}
return put(new INDArrayIndex[]{NDArrayIndex.all(), NDArrayIndex.point(column)}, toPut);
}
@Override
public double getDouble(int i) {
if(i >= length()) {
throw new IllegalArgumentException("Unable to get linear index >= " + length());
}
Nd4j.getCompressor().autoDecompress(this);
if(i == 0)
return data().getDouble(i);
int[] dimensions = ordering() == 'c'? Shape.ind2subC(this,i) : Shape.ind2sub(this, i);
Shape.assertShapeLessThan(dimensions,shape());
return getDouble(dimensions);
}
@Override
public double getDouble(int i, int j) {
return getDouble(new int[]{i, j});
}
@Override
public float getFloat(int i) {
return (float) getDouble(i);
}
@Override
public float getFloat(int i, int j) {
return (float) getDouble(i,j);
}
/**
* Return transposed copy of this matrix.
*/
@Override
public INDArray transpose() {
return transposei();
}
/**
*
* Return transposed version of this matrix.
*
* PLEASE NOTE: This method is NOT in place, it will return transposed copy instead.
*/
@Override
public INDArray transposei() {
return permute(ArrayUtil.reverseCopy(ArrayUtil.range(0,rank())));
}
protected INDArray create(DataBuffer data, int[] shape, int[] strides) {
if (this instanceof IComplexNDArray)
return Nd4j.createComplex(data, shape, strides, 0, ordering());
else
return Nd4j.create(data,shape,strides,0,ordering());
}
@Override
public INDArray reshape(char order, int... newShape) {
int numberNegativesOnes = 0;
int[] shape = ArrayUtil.copy(newShape);
for(int i = 0; i < shape.length; i++) {
if(shape[i] < 0) {
if(numberNegativesOnes >= 1)
throw new IllegalArgumentException("Only one dimension can be negative ones");
numberNegativesOnes++;
int shapeLength = 1;
for(int j = 0; j < shape.length; j++)
if(shape[j] >= 1)
shapeLength *= shape[j];
int realShape = Math.abs(length() / shapeLength);
int[] thisNewShape = new int[shape.length];
for(int j = 0; j < shape.length; j++) {
if(i != j) {
thisNewShape[j] = shape[j];
}
else
thisNewShape[j] = realShape;
}
shape = thisNewShape;
break;
}
}
INDArray reshapeAttempt = Shape.newShapeNoCopy(this, shape, order == 'f');
if(reshapeAttempt != null) {
// kinda strange get/set usage
// reshapeAttempt.setOrder(Shape.getOrder(reshapeAttempt));
return reshapeAttempt;
}
INDArray ret = Nd4j.createUninitialized(shape,order);
if(order != ordering()) {
ret.setData(dup(order).data());
}
else
ret.assign(this);
return ret;
}
@Override
public double getDoubleUnsafe(int offset) {
return data().getDouble(offset);
}
@Override
public INDArray putScalarUnsafe(int offset, double value) {
data().put(offset,value);
return this;
}
@Override
public int innerMostStride() {
if(ordering() == 'c')
return stride(-1);
return stride(0);
}
@Override
public INDArray reshape(char order, int rows, int columns) {
return reshape(order, new int[]{rows, columns});
}
/**
* Reshape the ndarray in to the specified dimensions,
* possible errors being thrown for invalid shapes
*
* Note here that one dimension can be -1.
* The dimension that is -1 will be inferred from the shape and
* the length of the ndarray
*
* @param shape the shape of the ndarray.
* @return the new reshaped nd array
*/
@Override
public INDArray reshape(int...shape) {
return reshape(Nd4j.order(), shape);
}
@Override
public void checkDimensions(INDArray other) {
assert Shape.contentEquals(other.shape(), Shape.shapeOf(shapeInformation)) : " Other array should have been shape: " + Shape.toString(Shape.shapeOf(shapeInformation)) + " but was " + Arrays.toString(other.shape());
assert Shape.contentEquals(other.stride(), Shape.stride(shapeInformation)) : " Other array should have been stride: " + Shape.toString(Shape.stride(shapeInformation)) + " but was " + Arrays.toString(other.stride());
assert Shape.offset(shapeInformation) == other.offset() : "Offset of this array is " + Shape.offset(shapeInformation) + " but other was " + other.offset();
}
/**
* Returns the product along a given dimension
*
* @param dimension the dimension to getScalar the product along
* @return the product along the specified dimension
*/
@Override
public INDArray prod(int...dimension) {
return Nd4j.getExecutioner().exec(new Prod(this), dimension);
}
/**
* Returns the overall mean of this ndarray
*
* @param dimension the dimension to getScalar the mean along
* @return the mean along the specified dimension of this ndarray
*/
@Override
public INDArray mean(int...dimension) {
return Nd4j.getExecutioner().exec(new Mean(this), dimension);
}
/**
* Returns the overall variance of this ndarray
*
* @param dimension the dimension to getScalar the mean along
* @return the mean along the specified dimension of this ndarray
*/
@Override
public INDArray var(int...dimension) {
return Nd4j.getExecutioner().exec(new Variance(this),dimension);
}
/**
* Returns the overall variance of this ndarray
*
* @param biasCorrected boolean on whether to apply corrected bias
* @param dimension the dimension to getScalar the mean along
* @return the mean along the specified dimension of this ndarray
*/
@Override
public INDArray var(boolean biasCorrected, int...dimension) {
return Nd4j.getExecutioner().exec(new Variance(this, biasCorrected),dimension);
}
/**
* Returns the overall max of this ndarray
*
* @param dimension the dimension to getScalar the mean along
* @return the mean along the specified dimension of this ndarray
*/
@Override
public INDArray max(int...dimension) {
return Nd4j.getExecutioner().exec(new Max(this),dimension);
}
/**
* Returns the overall min of this ndarray
*
* @param dimension the dimension to getScalar the mean along
* @return the mean along the specified dimension of this ndarray
*/
@Override
public INDArray min(int...dimension) {
return Nd4j.getExecutioner().exec(new Min(this),dimension);
}
/**
* Returns the sum along the last dimension of this ndarray
*
* @param dimension the dimension to getScalar the sum along
* @return the sum along the specified dimension of this ndarray
*/
@Override
public INDArray sum(int...dimension) {
return Nd4j.getExecutioner().exec(new Sum(this),dimension);
}
/**
* Returns the norm1 along the specified dimension
*
* @param dimension the dimension to getScalar the norm1 along
* @return the norm1 along the specified dimension
*/
@Override
public INDArray norm1(int...dimension) {
return Nd4j.getExecutioner().exec(new Norm1(this),dimension);
}
/**
* Standard deviation of an ndarray along a dimension
*
* @param dimension the dimension to getScalar the std along
* @return the standard deviation along a particular dimension
*/
@Override
public INDArray std(int...dimension) {
return Nd4j.getExecutioner().exec(new StandardDeviation(this),dimension);
}
@Override
public INDArray std(boolean biasCorrected, int... dimension) {
return Nd4j.getExecutioner().exec(new StandardDeviation(this,biasCorrected),dimension);
}
@Override
public Number stdNumber(boolean biasCorrected) {
return Nd4j.getExecutioner().exec(new StandardDeviation(this,biasCorrected),new int[]{Integer.MAX_VALUE}).getDouble(0);
}
/**
* Returns the norm2 along the specified dimension
*
* @param dimension the dimension to getScalar the norm2 along
* @return the norm2 along the specified dimension
*/
@Override
public INDArray norm2(int...dimension) {
return Nd4j.getExecutioner().exec(new Norm2(this),dimension);
}
/**
* Number of columns (shape[1]), throws an exception when
* called when not 2d
*
* @return the number of columns in the array (only 2d)
*/
@Override
public int columns() {
if (isMatrix()) return size(1);
else if (isVector()) {
if (isColumnVector())
return 1;
else if(isRowVector() && rank > 1)
return size(1);
else
return size(0);
}
throw new IllegalStateException("Unable to get number of of columns for a non 2d matrix");
}
/**
* Returns the number of rows
* in the array (only 2d) throws an exception when
* called when not 2d
*
* @return the number of rows in the matrix
*/
@Override
public int rows() {
if (isMatrix()) return size(0);
else if (isVector()) {
if (isRowVector())
return 1;
else
return size(0);
}
throw new IllegalStateException("Unable to get number of of rows for a non 2d matrix");
}
/**
* Flattens the array for linear indexing
*
* @return the flattened version of this array
*/
@Override
public INDArray ravel(char ordering) {
if(length >= Integer.MAX_VALUE)
throw new IllegalArgumentException("Length can not be >= Integer.MAX_VALUE");
INDArray ret = create(new int[]{1,(int)length}, ordering);
NDArrayIndex index = new NDArrayIndex(this.shape());
for(int i = 0; i < length(); i++) {
double val = getDouble(index.next());
ret.putScalar(new int[]{0,i},val);
}
return ret;
}
/**
* Flattens the array for linear indexing
*
* @return the flattened version of this array
*/
@Override
public INDArray ravel() {
return reshape(1,length());
}
/**
* Flattens the array for linear indexing
*
* @return the flattened version of this array
*/
@Override
public void sliceVectors(List list) {
if (isVector())
list.add(this);
else {
for (int i = 0; i < slices(); i++) {
slice(i).sliceVectors(list);
}
}
}
/**
* Reshape the matrix. Number of elements must not change.
*
* @param newRows
* @param newColumns
*/
@Override
public INDArray reshape(int newRows, int newColumns) {
return reshape(new int[]{newRows, newColumns});
}
/**
* Get the specified column
*
* @param c
*/
@Override
public INDArray getColumn(int c) {
if(isColumnVector() && c == 0)
return this;
else if(isColumnVector() && c > 0)
throw new IllegalArgumentException("Illegal index for row");
return get(NDArrayIndex.all(),NDArrayIndex.point(c));
}
/**
* Get whole rows from the passed indices.
*
* @param rindices
*/
@Override
public INDArray getRows(int[] rindices) {
return get(new SpecifiedIndex(rindices));
}
/**
* Returns a subset of this array based on the specified
* indexes
*
* @param indexes the indexes in to the array
* @return a view of the array with the specified indices
*/
@Override
public INDArray get(INDArrayIndex... indexes) {
if(indexes.length == 1 && indexes[0] instanceof NDArrayIndexAll)
return this;
ShapeOffsetResolution resolution = new ShapeOffsetResolution(this);
resolution.exec(indexes);
if(indexes.length < 1)
throw new IllegalStateException("Invalid index found of zero length");
int[] shape = resolution.getShapes();
if(indexes[0] instanceof SpecifiedIndex) {
INDArray ret = create(shape);
int count = 0;
if(isVector()) {
indexes[0].reset();
while(indexes[0].hasNext()) {
ret.putScalar(count++,getDouble(indexes[0].next()));
}
}
else {
while(indexes[0].hasNext()) {
int nextIdx = indexes[0].next();
INDArray next = slice(nextIdx);
if(indexes.length > 1) {
INDArray slice = next.get(Arrays.copyOfRange(indexes, 1, indexes.length));
ret.putSlice(count++, slice);
}
else if(next.isScalar()) {
ret.putScalar(count++,next.getDouble(0));
}
else if(next.isVector()) {
ret.putSlice(count++,next);
}
else
ret.putSlice(count++, next.get(indexes));
}
}
return ret;
}
INDArray ret = subArray(resolution);
return ret;
}
/**
* Get whole columns
* from the passed indices.
*
* @param cindices
*/
@Override
public INDArray getColumns(int...cindices) {
return get(NDArrayIndex.all(),new SpecifiedIndex(cindices));
}
protected INDArray create(int rows, int length) {
return create(new int[]{rows,length});
}
/**
* Get a copy of a row.
*
* @param r the row to get
*/
@Override
public INDArray getRow(int r) {
if(isRowVector() && r == 0)
return this;
else if(isRowVector() && r > 0)
throw new IllegalArgumentException("Illegal index for row");
return get(NDArrayIndex.point(r),NDArrayIndex.all());
}
/**
* Compare two matrices. Returns true if and only if other is also a
* DoubleMatrix which has the same size and the maximal absolute
* difference in matrix elements is smaller than 1e-6.
*
* @param o
*/
@Override
public boolean equals(Object o) {
if (o == null)
return false;
if (!(o instanceof INDArray))
return false;
INDArray n = (INDArray) o;
if (this.lengthLong() != n.lengthLong())
return false;
//epsilon equals
if (isScalar() && n.isScalar()) {
if (data.dataType() == DataBuffer.Type.FLOAT) {
double val = getDouble(0);
double val2 = n.getDouble(0);
if (Double.isNaN(val) != Double.isNaN(val2))
return false;
return Math.abs(val - val2) < Nd4j.EPS_THRESHOLD;
} else {
double val = getDouble(0);
double val2 = n.getDouble(0);
if (Double.isNaN(val) != Double.isNaN(val2))
return false;
return Math.abs(val - val2) < Nd4j.EPS_THRESHOLD;
}
} else if (isVector() && n.isVector()) {
EqualsWithEps op = new EqualsWithEps(this, n);
Nd4j.getExecutioner().exec(op);
double diff = op.getFinalResult().doubleValue();
return diff < 0.5;
/*
for (int i = 0; i < length; i++) {
if (data.dataType() == DataBuffer.Type.FLOAT) {
double curr = getDouble(i);
double comp = n.getDouble(i);
if (Double.isNaN(curr) != Double.isNaN(comp))
return false;
if (Math.abs(curr - comp) > Nd4j.EPS_THRESHOLD)
return false;
} else {
double curr = getDouble(i);
double comp = n.getDouble(i);
if (Double.isNaN(curr) != Double.isNaN(comp))
return false;
if (Math.abs(curr - comp) > Nd4j.EPS_THRESHOLD)
return false;
}
}
return true;
*/
}
if (!Arrays.equals(this.shape(), n.shape()))
return false;
if (!Shape.shapeEquals(shape(), n.shape())) {
return false;
}
if (slices() != n.slices())
return false;
if(n.ordering() == ordering()) {
EqualsWithEps op = new EqualsWithEps(this, n);
Nd4j.getExecutioner().exec(op);
double diff = op.getFinalResult().doubleValue();
return diff < 0.5;
/*
for(int i = 0; i < length(); i++) {
double val = getDouble(i);
double val2 = n.getDouble(i);
if (Double.isNaN(val) != Double.isNaN(val2)) {
return false;
}
if (Math.abs(val - val2) >= Nd4j.EPS_THRESHOLD) {
return false;
}
}
return true;
*/
}
else {
EqualsWithEps op = new EqualsWithEps(this, n);
Nd4j.getExecutioner().exec(op);
double diff = op.getFinalResult().doubleValue();
return diff < 0.5;
/*
NdIndexIterator iter = new NdIndexIterator(n.shape());
while(iter.hasNext()) {
int[] next = iter.next();
double val = getDouble(next);
double val2 = n.getDouble(next);
if (Double.isNaN(val) != Double.isNaN(val2))
return false;
if (Math.abs(val - val2) >= Nd4j.EPS_THRESHOLD) {
return false;
}
}
return true;
*/
}
}
@Override
public DataBuffer shapeInfoDataBuffer() {
return shapeInformation;
}
@Override
public IntBuffer shapeInfo() {
return shapeInformation.asNioInt();
}
/**
* Returns the shape(dimensions) of this array
*
* @return the shape of this matrix
*/
public int[] shape() {
return Shape.shape(shapeInformation);
}
/**
* Returns the shape information debugging
* information
*
* @return the shape information debugging information
*/
@Override
public String shapeInfoToString() {
return Shape.shapeToString(this);
}
/**
* Returns the stride(indices along the linear index for which each slice is accessed) of this array
*
* @return the stride of this array
*/
@Override
public int[] stride() {
int[] ret = new int[Shape.rank(shapeInformation)];
DataBuffer buffer = Shape.stride(shapeInformation);
for(int i = 0; i < ret.length; i++)
ret[i] = buffer.getInt(i);
return ret;
}
@Override
public int offset() {
if(data().offset() >= Integer.MAX_VALUE)
throw new IllegalArgumentException("Offset of buffer can not be >= Integer.MAX_VALUE");
// return Shape.offset(shapeInfo());
return (int)data().offset();
}
@Override
public char ordering() {
return Shape.order(shapeInformation);
}
/**
* Returns the size of this array
* along a particular dimension
*
* @param dimension the dimension to return from
* @return the shape of the specified dimension
*/
@Override
public int size(int dimension) {
if (isScalar()) {
if (dimension == 0 || dimension == 1 || dimension < 0)
return (int)length;
else
throw new IllegalArgumentException("Illegal dimension for scalar " + dimension);
}
if(dimension < 0) {
return shapeOf().getInt(dimension + Shape.rank(shapeInformation));
}
if(dimension >= rank())
throw new IllegalArgumentException("Invalid size index " + dimension + " wher it's >= rank " + rank());
return shapeOf().getInt(dimension);
}
@Override
public int rank() {
return Shape.rank(shapeInformation);
}
/**
* Returns the total number of elements in the ndarray
*
* @return the number of elements in the ndarray
*/
@Override
public int length() {
if(length >= Integer.MAX_VALUE)
throw new IllegalArgumentException("Length is >= Integer.MAX_VALUE: lengthLong() must be called instead");
return (int)length;
}
/**
* Returns the total number of elements in the ndarray
*
* @return the number of elements in the ndarray
*/
@Override
public long lengthLong() {
return length;
}
/**
* Broadcasts this ndarray to be the specified shape
*
* @param shape the new shape of this ndarray
* @return the broadcasted ndarray
*/
@Override
public INDArray broadcast(int...shape) {
if (Shape.shapeEquals(shape, shape()))
return this;
boolean compatible = true;
int count = shape.length - 1;
int thisCount = Shape.rank(shapeInformation) - 1;
for (int i = shape.length - 1; i > 0; i--) {
if (count < 0 || thisCount < 0)
break;
if (shape[count] != shape()[thisCount] && shape[count] != 1 && shape()[thisCount] != 1) {
compatible = false;
break;
}
count--;
thisCount--;
}
if (!compatible)
throw new IllegalArgumentException("Incompatible broadcast from " + Arrays.toString(shape()) + " to " + Arrays.toString(shape));
int[] retShape = new int[shape.length];
List broadCastDimensions = new ArrayList<>();
List nonBroadCastDimensions = new ArrayList<>();
for (int i = 0; i < retShape.length; i++) {
if(shape().length == 1) {
if(i == 0) {
if (i < shape().length)
retShape[i] = Math.max(1, shape[i]);
else
retShape[i] = shape[i];
}
else {
if (i < shape().length)
retShape[i] = Math.max(shape[i], size(i));
else
retShape[i] = shape[i];
}
}
else {
if(i < rank() && size(i) == 1)
broadCastDimensions.add(i);
else
nonBroadCastDimensions.add(i);
if (i < shape().length)
retShape[i] = Math.max(shape[i], size(i));
else
retShape[i] = shape[i];
}
}
INDArray ret = create(retShape,ordering());
if(isRowVector()) {
//number of times to repeat each value
for(int i = 0; i < ret.slices(); i++) {
ret.putSlice(i,this);
}
}
else {
//number of times to repeat each value
int repeatDelta = ArrayUtil.prod(retShape) / length();
for(int i = 0; i < slices(); i++) {
INDArray thisTensor = slice(i);
INDArray retTensor = ret.slice(i);
int retIdx = 0;
int tensorLen = thisTensor.rank();
outer: for(int k = 0; k < tensorLen; k++) {
for(int j = 0; j < repeatDelta; j++) {
if(retIdx >= retTensor.length())
break outer;
retTensor.putScalar(retIdx++,thisTensor.getDouble(k));
}
}
}
}
return ret;
}
/**
* Dimshuffle: an extension of permute that adds the ability
* to broadcast various dimensions.
*
* See theano for more examples.
* This will only accept integers and xs.
*
* An x indicates a dimension should be broadcasted rather than permuted.
*
* @param rearrange the dimensions to swap to
* @return the newly permuted array
*/
@Override
public INDArray dimShuffle(Object[] rearrange, int[] newOrder, boolean[] broadCastable) {
if(broadCastable.length != Shape.rank(shapeInformation))
throw new IllegalArgumentException("The broadcastable dimensions must be the same length as the current shape");
boolean broadcast = false;
Set
