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package org.nd4j.serde.binary;
import lombok.extern.slf4j.Slf4j;
import org.nd4j.linalg.primitives.Pair;
import org.bytedeco.javacpp.BytePointer;
import org.nd4j.linalg.api.buffer.DataBuffer;
import org.nd4j.linalg.api.concurrency.AffinityManager;
import org.nd4j.linalg.api.ndarray.INDArray;
import org.nd4j.linalg.api.shape.Shape;
import org.nd4j.linalg.compression.CompressedDataBuffer;
import org.nd4j.linalg.compression.CompressionDescriptor;
import org.nd4j.linalg.factory.Nd4j;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.IntBuffer;
import java.nio.channels.FileChannel;
import java.util.Arrays;
/**
* Created by agibsonccc on 7/1/17.
*/
@Slf4j
public class BinarySerde {
/**
* Create an ndarray
* from the unsafe buffer
* @param buffer the buffer to create the array from
* @return the ndarray derived from this buffer
*/
public static INDArray toArray(ByteBuffer buffer, int offset) {
return toArrayAndByteBuffer(buffer, offset).getLeft();
}
/**
* Create an ndarray
* from the unsafe buffer
* @param buffer the buffer to create the array from
* @return the ndarray derived from this buffer
*/
public static INDArray toArray(ByteBuffer buffer) {
return toArray(buffer, 0);
}
/**
* Create an ndarray and existing bytebuffer
* @param buffer
* @param offset
* @return
*/
public static Pair toArrayAndByteBuffer(ByteBuffer buffer, int offset) {
ByteBuffer byteBuffer =
buffer == null
? ByteBuffer.allocateDirect(buffer.array().length).put(buffer.array())
.order(ByteOrder.nativeOrder())
: buffer.order(ByteOrder.nativeOrder());
//bump the byte buffer to the proper position
byteBuffer.position(offset);
int rank = byteBuffer.getInt();
if (rank < 0)
throw new IllegalStateException("Found negative integer. Corrupt serialization?");
//get the shape buffer length to create the shape information buffer
int shapeBufferLength = Shape.shapeInfoLength(rank);
//create the ndarray shape information
DataBuffer shapeBuff = Nd4j.createBufferDetached(new int[shapeBufferLength]);
//compute the databuffer type from the index
DataBuffer.Type type = DataBuffer.Type.values()[byteBuffer.getInt()];
for (int i = 0; i < shapeBufferLength; i++) {
shapeBuff.put(i, byteBuffer.getInt());
}
//after the rank,data type, shape buffer (of length shape buffer length) * sizeof(int)
if (type != DataBuffer.Type.COMPRESSED) {
ByteBuffer slice = byteBuffer.slice();
//wrap the data buffer for the last bit
DataBuffer buff = Nd4j.createBuffer(slice, type, Shape.length(shapeBuff));
//advance past the data
int position = byteBuffer.position() + (buff.getElementSize() * (int) buff.length());
byteBuffer.position(position);
//create the final array
//TODO: see how to avoid dup here
INDArray arr = Nd4j.createArrayFromShapeBuffer(buff.dup(), shapeBuff.dup());
return Pair.of(arr, byteBuffer);
} else {
CompressionDescriptor compressionDescriptor = CompressionDescriptor.fromByteBuffer(byteBuffer);
ByteBuffer slice = byteBuffer.slice();
//ensure that we only deal with the slice of the buffer that is actually the data
BytePointer byteBufferPointer = new BytePointer(slice);
//create a compressed array based on the rest of the data left in the buffer
CompressedDataBuffer compressedDataBuffer =
new CompressedDataBuffer(byteBufferPointer, compressionDescriptor);
//TODO: see how to avoid dup()
INDArray arr = Nd4j.createArrayFromShapeBuffer(compressedDataBuffer.dup(), shapeBuff.dup());
//advance past the data
int compressLength = (int) compressionDescriptor.getCompressedLength();
byteBuffer.position(byteBuffer.position() + compressLength);
return Pair.of(arr, byteBuffer);
}
}
/**
* Convert an ndarray to an unsafe buffer
* for use by aeron
* @param arr the array to convert
* @return the unsafebuffer representation of this array
*/
public static ByteBuffer toByteBuffer(INDArray arr) {
//subset and get rid of 1 off non 1 element wise stride cases
if (arr.isView())
arr = arr.dup();
if (!arr.isCompressed()) {
ByteBuffer b3 = ByteBuffer.allocateDirect(byteBufferSizeFor(arr)).order(ByteOrder.nativeOrder());
doByteBufferPutUnCompressed(arr, b3, true);
return b3;
}
//compressed array
else {
ByteBuffer b3 = ByteBuffer.allocateDirect(byteBufferSizeFor(arr)).order(ByteOrder.nativeOrder());
doByteBufferPutCompressed(arr, b3, true);
return b3;
}
}
/**
* Returns the byte buffer size for the given
* ndarray. This is an auxillary method
* for determining the size of the buffer
* size to allocate for sending an ndarray via
* the aeron media driver.
*
* The math break down for uncompressed is:
* 2 ints for rank of the array and an ordinal representing the data type of the data buffer
* The rest is in order:
* shape information
* data buffer
*
* The math break down for compressed is:
* 2 ints for rank and an ordinal representing the data type for the data buffer
*
* The rest is in order:
* shape information
* codec information
* data buffer
*
* @param arr the array to compute the size for
* @return the size of the byte buffer that was allocated
*/
public static int byteBufferSizeFor(INDArray arr) {
if (!arr.isCompressed()) {
ByteBuffer buffer = arr.data().pointer().asByteBuffer().order(ByteOrder.nativeOrder());
ByteBuffer shapeBuffer = arr.shapeInfoDataBuffer().pointer().asByteBuffer().order(ByteOrder.nativeOrder());
//2 four byte ints at the beginning
int twoInts = 8;
return twoInts + buffer.limit() + shapeBuffer.limit();
} else {
CompressedDataBuffer compressedDataBuffer = (CompressedDataBuffer) arr.data();
CompressionDescriptor descriptor = compressedDataBuffer.getCompressionDescriptor();
ByteBuffer codecByteBuffer = descriptor.toByteBuffer();
ByteBuffer buffer = arr.data().pointer().asByteBuffer().order(ByteOrder.nativeOrder());
ByteBuffer shapeBuffer = arr.shapeInfoDataBuffer().pointer().asByteBuffer().order(ByteOrder.nativeOrder());
int twoInts = 2 * 4;
return twoInts + buffer.limit() + shapeBuffer.limit() + codecByteBuffer.limit();
}
}
/**
* Setup the given byte buffer
* for serialization (note that this is for uncompressed INDArrays)
* 4 bytes int for rank
* 4 bytes for data type
* shape buffer
* data buffer
*
* @param arr the array to setup
* @param allocated the byte buffer to setup
* @param rewind whether to rewind the byte buffer or nt
*/
public static void doByteBufferPutUnCompressed(INDArray arr, ByteBuffer allocated, boolean rewind) {
// ensure we send data to host memory
Nd4j.getExecutioner().commit();
Nd4j.getAffinityManager().ensureLocation(arr, AffinityManager.Location.HOST);
ByteBuffer buffer = arr.data().pointer().asByteBuffer().order(ByteOrder.nativeOrder());
ByteBuffer shapeBuffer = arr.shapeInfoDataBuffer().pointer().asByteBuffer().order(ByteOrder.nativeOrder());
//2 four byte ints at the beginning
allocated.putInt(arr.rank());
//put data type next so its self describing
allocated.putInt(arr.data().dataType().ordinal());
allocated.put(shapeBuffer);
allocated.put(buffer);
if (rewind)
allocated.rewind();
}
/**
* Setup the given byte buffer
* for serialization (note that this is for compressed INDArrays)
* 4 bytes for rank
* 4 bytes for data type
* shape information
* codec information
* data type
*
* @param arr the array to setup
* @param allocated the byte buffer to setup
* @param rewind whether to rewind the byte buffer or not
*/
public static void doByteBufferPutCompressed(INDArray arr, ByteBuffer allocated, boolean rewind) {
CompressedDataBuffer compressedDataBuffer = (CompressedDataBuffer) arr.data();
CompressionDescriptor descriptor = compressedDataBuffer.getCompressionDescriptor();
ByteBuffer codecByteBuffer = descriptor.toByteBuffer();
ByteBuffer buffer = arr.data().pointer().asByteBuffer().order(ByteOrder.nativeOrder());
ByteBuffer shapeBuffer = arr.shapeInfoDataBuffer().pointer().asByteBuffer().order(ByteOrder.nativeOrder());
allocated.putInt(arr.rank());
//put data type next so its self describing
allocated.putInt(arr.data().dataType().ordinal());
//put shape next
allocated.put(shapeBuffer);
//put codec information next
allocated.put(codecByteBuffer);
//finally put the data
allocated.put(buffer);
if (rewind)
allocated.rewind();
}
/**
* Write an ndarray to disk in
* binary format
* @param arr the array to write
* @param toWrite the file tow rite to
* @throws IOException
*/
public static void writeArrayToDisk(INDArray arr,File toWrite) throws IOException {
try(FileOutputStream os = new FileOutputStream(toWrite)) {
FileChannel channel = os.getChannel();
ByteBuffer buffer = BinarySerde.toByteBuffer(arr);
channel.write(buffer);
}
}
/**
* Read an ndarray from disk
* @param readFrom
* @return
* @throws IOException
*/
public static INDArray readFromDisk(File readFrom) throws IOException {
try(FileInputStream os = new FileInputStream(readFrom)) {
FileChannel channel = os.getChannel();
ByteBuffer buffer = ByteBuffer.allocateDirect((int) readFrom.length());
channel.read(buffer);
INDArray ret = toArray(buffer);
return ret;
}
}
/**
* This method returns shape databuffer from saved earlier file
*
* @param readFrom
* @return
* @throws IOException
*/
public static DataBuffer readShapeFromDisk(File readFrom) throws IOException {
try(FileInputStream os = new FileInputStream(readFrom)) {
FileChannel channel = os.getChannel();
// we read shapeinfo up to max_rank value, which is 32
int len = (int) Math.min((32 * 2 + 3) * 4, readFrom.length());
ByteBuffer buffer = ByteBuffer.allocateDirect(len);
channel.read(buffer);
ByteBuffer byteBuffer =
buffer == null
? ByteBuffer.allocateDirect(buffer.array().length).put(buffer.array())
.order(ByteOrder.nativeOrder())
: buffer.order(ByteOrder.nativeOrder());
buffer.position(0);
int rank = byteBuffer.getInt();
int result[] = new int[Shape.shapeInfoLength(rank)];
// filling DataBuffer with shape info
result[0] = rank;
// skipping two next values (dtype and rank again)
byteBuffer.position(12);
// filling shape information
for (int e = 1; e < Shape.shapeInfoLength(rank); e++) {
result[e] = byteBuffer.getInt();
}
// creating nd4j databuffer now
DataBuffer dataBuffer = Nd4j.getDataBufferFactory().createInt(result);
return dataBuffer;
}
}
}
