org.nd4j.linalg.compression.BasicNDArrayCompressor Maven / Gradle / Ivy
package org.nd4j.linalg.compression;
import lombok.NonNull;
import org.nd4j.linalg.api.buffer.DataBuffer;
import org.nd4j.linalg.api.ndarray.INDArray;
import org.nd4j.linalg.api.ops.executioner.GridExecutioner;
import org.nd4j.linalg.factory.Nd4j;
import org.reflections.Reflections;
import org.reflections.scanners.SubTypesScanner;
import org.reflections.util.ClasspathHelper;
import org.reflections.util.ConfigurationBuilder;
import org.reflections.util.FilterBuilder;
import java.lang.reflect.Modifier;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
/**
* @author [email protected]
*/
public class BasicNDArrayCompressor {
private static final BasicNDArrayCompressor INSTANCE = new BasicNDArrayCompressor();
protected Map codecs;
protected String defaultCompression = "FLOAT16";
private BasicNDArrayCompressor() {
loadCompressors();
}
protected void loadCompressors() {
/*
We scan classpath for NDArrayCompressor implementations and add them one by one to codecs map
*/
codecs = new ConcurrentHashMap<>();
Set> classes = new Reflections(new ConfigurationBuilder()
.filterInputsBy(new FilterBuilder().include(FilterBuilder.prefix("org.nd4j"))
.exclude("^(?!.*\\.class$).*$")) //Consider only .class files (to avoid debug messages etc. on .dlls, etc
.setUrls(ClasspathHelper.forPackage("org.nd4j")).setScanners(new SubTypesScanner()))
.getSubTypesOf(NDArrayCompressor.class);
for (Class impl : classes) {
if (Modifier.isAbstract(impl.getModifiers()) || impl.isInterface())
continue;
try {
NDArrayCompressor compressor = impl.newInstance();
codecs.put(compressor.getDescriptor().toUpperCase(), compressor);
} catch (InstantiationException i) {
; // we need catch there, to avoid exceptions at abstract classes
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}
/**
* Get the set of available codecs for
* compression
* @return
*/
public Set getAvailableCompressors() {
return codecs.keySet();
}
/**
* Prints available compressors to standard out
*/
public void printAvailableCompressors() {
StringBuilder builder = new StringBuilder();
builder.append("Available compressors: ");
for (String comp : codecs.keySet()) {
builder.append("[").append(comp).append("] ");
}
System.out.println(builder.toString());
}
/**
* Get the ndarray compressor
* singleton
* @return
*/
public static BasicNDArrayCompressor getInstance() {
return INSTANCE;
}
/**
* Set the default compression algorithm
* @param algorithm the algorithm to set
* @return
*/
public BasicNDArrayCompressor setDefaultCompression(@NonNull String algorithm) {
algorithm = algorithm.toUpperCase();
// if (!codecs.containsKey(algorithm))
// throw new RuntimeException("Non-existent compression algorithm requested: [" + algorithm + "]");
synchronized (this) {
defaultCompression = algorithm;
}
return this;
}
/**
* Get the default compression algorithm as a string.
* This is an all caps algorithm with a representation in the
* CompressionAlgorithm enum
* @return
*/
public String getDefaultCompression() {
synchronized (this) {
return defaultCompression;
}
}
/**
* Compress the given data buffer
* given the default compression algorithm
* @param buffer the data buffer to compress
* @return the compressed version of the data buffer
*/
public DataBuffer compress(DataBuffer buffer) {
return compress(buffer, getDefaultCompression());
}
/**
* Compress the data buffer
* given a specified algorithm
* @param buffer the buffer to compress
* @param algorithm the algorithm to compress
* use
* @return the compressed data buffer
*/
public DataBuffer compress(DataBuffer buffer, String algorithm) {
algorithm = algorithm.toUpperCase();
if (!codecs.containsKey(algorithm))
throw new RuntimeException("Non-existent compression algorithm requested: [" + algorithm + "]");
return codecs.get(algorithm).compress(buffer);
}
public INDArray compress(INDArray array) {
Nd4j.getExecutioner().commit();
return compress(array, getDefaultCompression());
}
/**
* In place compression of the passed in ndarray
* with the default compression algorithm
* @param array
*/
public void compressi(INDArray array) {
compressi(array, getDefaultCompression());
}
/**
* Returns a compressed version of the
* given ndarray
* @param array the array to compress
* @param algorithm the algorithm to compress with
* @return a compressed copy of this ndarray
*/
public INDArray compress(INDArray array, String algorithm) {
algorithm = algorithm.toUpperCase();
if (!codecs.containsKey(algorithm))
throw new RuntimeException("Non-existent compression algorithm requested: [" + algorithm + "]");
return codecs.get(algorithm).compress(array);
}
/**
* In place Compress the given ndarray
* with the given algorithm
* @param array the array to compress
* @param algorithm
*/
public void compressi(INDArray array, String algorithm) {
algorithm = algorithm.toUpperCase();
if (!codecs.containsKey(algorithm))
throw new RuntimeException("Non-existent compression algorithm requested: [" + algorithm + "]");
codecs.get(algorithm).compressi(array);
}
/**
* Decompress the given databuffer
* @param buffer the databuffer to compress
* @return the decompressed databuffer
*/
public DataBuffer decompress(DataBuffer buffer) {
if (buffer.dataType() != DataBuffer.Type.COMPRESSED)
throw new IllegalStateException("You can't decompress DataBuffer with dataType of: " + buffer.dataType());
CompressedDataBuffer comp = (CompressedDataBuffer) buffer;
CompressionDescriptor descriptor = comp.getCompressionDescriptor();
if (!codecs.containsKey(descriptor.getCompressionAlgorithm()))
throw new RuntimeException("Non-existent compression algorithm requested: ["
+ descriptor.getCompressionAlgorithm() + "]");
return codecs.get(descriptor.getCompressionAlgorithm()).decompress(buffer);
}
public NDArrayCompressor getCompressor(@NonNull String name) {
return codecs.get(name);
}
/**
*
* @param array
* @return
*/
public INDArray decompress(INDArray array) {
if (array.data().dataType() != DataBuffer.Type.COMPRESSED)
return array;
CompressedDataBuffer comp = (CompressedDataBuffer) array.data();
CompressionDescriptor descriptor = comp.getCompressionDescriptor();
if (!codecs.containsKey(descriptor.getCompressionAlgorithm()))
throw new RuntimeException("Non-existent compression algorithm requested: ["
+ descriptor.getCompressionAlgorithm() + "]");
return codecs.get(descriptor.getCompressionAlgorithm()).decompress(array);
}
/**
* in place decompression of the given
* ndarray. If the ndarray isn't compressed
* this will do nothing
* @param array the array to decompressed
* if it is comprssed
*/
public void decompressi(INDArray array) {
if (array.data().dataType() != DataBuffer.Type.COMPRESSED)
return;
CompressedDataBuffer comp = (CompressedDataBuffer) array.data();
CompressionDescriptor descriptor = comp.getCompressionDescriptor();
if (!codecs.containsKey(descriptor.getCompressionAlgorithm()))
throw new RuntimeException("Non-existent compression algorithm requested: ["
+ descriptor.getCompressionAlgorithm() + "]");
codecs.get(descriptor.getCompressionAlgorithm()).decompressi(array);
}
/**
* Decompress several ndarrays
* @param arrays
*/
public void autoDecompress(INDArray... arrays) {
for (INDArray array : arrays) {
autoDecompress(array);
}
}
/**
*
* @param array
*/
public void autoDecompress(INDArray array) {
if (array.isCompressed())
decompressi(array);
}
/**
* This method returns compressed INDArray instance which contains JVM array passed in
*
* @param array
* @return
*/
public INDArray compress(float[] array) {
return codecs.get(defaultCompression).compress(array);
}
/**
* This method returns compressed INDArray instance which contains JVM array passed in
*
* @param array
* @return
*/
public INDArray compress(double[] array) {
return codecs.get(defaultCompression).compress(array);
}
}