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/*******************************************************************************
* Copyright (c) 2015-2018 Skymind, Inc.
*
* This program and the accompanying materials are made available under the
* terms of the Apache License, Version 2.0 which is available at
* https://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.
*
* SPDX-License-Identifier: Apache-2.0
******************************************************************************/
package org.nd4j.linalg.api.ops.impl.transforms;
import org.nd4j.autodiff.samediff.SDVariable;
import org.nd4j.autodiff.samediff.SameDiff;
import org.nd4j.base.Preconditions;
import org.nd4j.imports.NoOpNameFoundException;
import org.nd4j.linalg.api.ndarray.INDArray;
import org.nd4j.linalg.api.ops.BaseTransformOp;
import org.nd4j.linalg.factory.Nd4j;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
/**
* Soft max function
* row_maxes is a row vector (max for each row)
* row_maxes = rowmaxes(input)
* diff = exp(input - max) / diff.rowSums()
* Outputs a probability distribution.
* Note that this is a parameterized model and requires
* the sum and max for the vector being calculated
*
* @author Adam Gibson
*/
public class OldSoftMax extends BaseTransformOp {
public OldSoftMax(SameDiff sameDiff, SDVariable i_v1, SDVariable i_v2) {
super(sameDiff, i_v1, i_v2);
}
public OldSoftMax(SameDiff sameDiff, SDVariable i_v1, SDVariable i_v2, boolean inPlace) {
super(sameDiff, i_v1, i_v2, inPlace);
}
public OldSoftMax(SameDiff sameDiff, SDVariable i_v, boolean inPlace) {
super(sameDiff, i_v, inPlace);
}
public OldSoftMax(SameDiff sameDiff, SDVariable i_v, long[] shape, boolean inPlace, Object[] extraArgs) {
super(sameDiff, i_v, shape, inPlace, extraArgs);
}
public OldSoftMax(SameDiff sameDiff, SDVariable i_v, Object[] extraArgs) {
super(sameDiff, i_v, extraArgs);
}
public OldSoftMax() {
}
public OldSoftMax(INDArray x, INDArray z) {
this(x, null, z);
}
public OldSoftMax(INDArray x, INDArray z, long n) {
this(x, null, z, n);
}
public OldSoftMax(INDArray x, INDArray y, INDArray z, long n) {
super(x, y, z, n);
Preconditions.checkArgument(x != null && x.rank() == 2, "OldSoftMax op supports rank 2 (2d) arrays only. Got x (source) array with shape: %ndShape", x);
Preconditions.checkArgument(z != null && z.rank() == 2, "OldSoftMax op supports rank 2 (2d) arrays only. Got z (result) array with shape: %ndShape", z);
}
public OldSoftMax(INDArray x, INDArray y, INDArray z) {
this(x, y, z, x.lengthLong());
}
public OldSoftMax(INDArray x) {
super(x);
Preconditions.checkArgument(x != null && x.rank() == 2, "OldSoftMax op supports rank 2 (2d) arrays only");
}
@Override
public int opNum() {
return 38;
}
@Override
public boolean isExecSpecial() {
return true;
}
@Override
public String opName() {
return "old_softmax";
}
@Override
public String onnxName() {
return "Softmax";
}
@Override
public String tensorflowName() {
throw new NoOpNameFoundException("No tensorflow op opName found for " + opName());
}
@Override
public void exec() {
exec(1);
}
@Override
public void init(INDArray x, INDArray y, INDArray z, long n) {
super.init(x, y, z, n);
passThrough = true;
}
@Override
public void exec(int... dimensions) {
if (dimensions[0] != 1)
throw new IllegalArgumentException("Only supports row wise calculations");
if (x.isMatrix()) {
INDArray maxAlongDimension = x.max(dimensions);
if (!maxAlongDimension.isVector() && !maxAlongDimension.isScalar())
throw new IllegalStateException("Max along dimension for input must either be a row vector or scalar");
INDArray xMinusMax = x.subColumnVector(maxAlongDimension);
INDArray exp;
if (z != null) {
exp = Nd4j.getExecutioner().execAndReturn(new Exp(xMinusMax, z));
} else {
exp = Nd4j.getExecutioner().execAndReturn(new Exp(xMinusMax));
}
INDArray sum = exp.sum(dimensions);
exp.diviColumnVector(sum);
if (z == null)
z = exp;
} else if (x.isVector()) {
double max = x.maxNumber().doubleValue();
INDArray exp;
if (z != null) {
exp = Nd4j.getExecutioner().execAndReturn(new Exp(x.sub(max), z));
} else {
exp = Nd4j.getExecutioner().execAndReturn(new Exp(x.sub(max)));
}
exp.divi(exp.sumNumber().doubleValue());
this.z = exp;
}
}
@Override
public List doDiff(List i_v) {
SDVariable ret = f().softmaxDerivative(arg(), i_v.get(0), 1);
return Collections.singletonList(ret);
}
}