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Pure Java Neural Networks Components
/*
* Copyright (c) 2019 by Andrew Charneski.
*
* The author licenses this file to you 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 com.simiacryptus.mindseye.layers.java;
import com.google.gson.JsonObject;
import com.simiacryptus.mindseye.lang.*;
import com.simiacryptus.util.Util;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.UUID;
import java.util.function.DoubleSupplier;
import java.util.stream.IntStream;
/**
* Rectified Linear Unit. y=(x<0)?0:x
*/
@SuppressWarnings("serial")
public class ReLuActivationLayer extends LayerBase {
@SuppressWarnings("unused")
private static final Logger log = LoggerFactory.getLogger(ReLuActivationLayer.class);
@Nullable
private final Tensor weights;
/**
* Instantiates a new Re lu activation key.
*/
public ReLuActivationLayer() {
super();
weights = new Tensor(1);
weights.set(0, 1.);
this.frozen = true;
}
/**
* Instantiates a new Re lu activation key.
*
* @param json the json
* @param resources the resources
*/
protected ReLuActivationLayer(@Nonnull final JsonObject json, Map resources) {
super(json);
weights = Tensor.fromJson(json.get("weights"), resources);
}
/**
* From json re lu activation key.
*
* @param json the json
* @param rs the rs
* @return the re lu activation key
*/
public static ReLuActivationLayer fromJson(@Nonnull final JsonObject json, Map rs) {
return new ReLuActivationLayer(json, rs);
}
@Override
protected void _free() {
weights.freeRef();
super._free();
}
/**
* Add weights re lu activation key.
*
* @param f the f
* @return the re lu activation key
*/
@Nonnull
public ReLuActivationLayer addWeights(@Nonnull final DoubleSupplier f) {
Util.add(f, weights.getData());
return this;
}
@Nonnull
@Override
public Result eval(final Result... inObj) {
final Result input = inObj[0];
final TensorList indata = input.getData();
input.addRef();
indata.addRef();
weights.addRef();
final int itemCnt = indata.length();
return new Result(TensorArray.wrap(IntStream.range(0, itemCnt).parallel().mapToObj(dataIndex -> {
@Nullable Tensor tensorElement = indata.get(dataIndex);
@Nonnull final Tensor tensor = tensorElement.multiply(weights.get(0));
tensorElement.freeRef();
@Nullable final double[] outputData = tensor.getData();
for (int i = 0; i < outputData.length; i++) {
if (outputData[i] < 0) {
outputData[i] = 0;
}
}
return tensor;
}).toArray(i -> new Tensor[i])), (@Nonnull final DeltaSet buffer, @Nonnull final TensorList delta) -> {
if (!isFrozen()) {
IntStream.range(0, delta.length()).parallel().forEach(dataIndex -> {
@Nullable Tensor deltaTensor = delta.get(dataIndex);
@Nullable final double[] deltaData = deltaTensor.getData();
@Nullable Tensor inputTensor = indata.get(dataIndex);
@Nullable final double[] inputData = inputTensor.getData();
@Nonnull final Tensor weightDelta = new Tensor(weights.getDimensions());
@Nullable final double[] weightDeltaData = weightDelta.getData();
for (int i = 0; i < deltaData.length; i++) {
weightDeltaData[0] += inputData[i] < 0 ? 0 : deltaData[i] * inputData[i];
}
buffer.get(ReLuActivationLayer.this.getId(), weights.getData()).addInPlace(weightDeltaData).freeRef();
deltaTensor.freeRef();
inputTensor.freeRef();
weightDelta.freeRef();
});
}
if (input.isAlive()) {
final double weight = weights.getData()[0];
@Nonnull TensorArray tensorArray = TensorArray.wrap(IntStream.range(0, delta.length()).parallel().mapToObj(dataIndex -> {
@Nullable Tensor deltaTensor = delta.get(dataIndex);
@Nullable final double[] deltaData = deltaTensor.getData();
@Nullable Tensor inTensor = indata.get(dataIndex);
@Nullable final double[] inputData = inTensor.getData();
@Nonnull final int[] dims = inTensor.getDimensions();
@Nonnull final Tensor passback = new Tensor(dims);
for (int i = 0; i < passback.length(); i++) {
passback.set(i, inputData[i] < 0 ? 0 : deltaData[i] * weight);
}
inTensor.freeRef();
deltaTensor.freeRef();
return passback;
}).toArray(i -> new Tensor[i]));
input.accumulate(buffer, tensorArray);
}
}) {
@Override
protected void _free() {
input.freeRef();
indata.freeRef();
weights.freeRef();
}
@Override
public boolean isAlive() {
return input.isAlive() || !isFrozen();
}
};
}
@Nonnull
@Override
public JsonObject getJson(Map resources, @Nonnull DataSerializer dataSerializer) {
@Nonnull final JsonObject json = super.getJsonStub();
json.add("weights", weights.toJson(resources, dataSerializer));
return json;
}
/**
* Gets mobility.
*
* @return the mobility
*/
protected double getMobility() {
return 1;
}
/**
* Sets weight.
*
* @param data the data
* @return the weight
*/
@Nonnull
public ReLuActivationLayer setWeight(final double data) {
weights.set(0, data);
return this;
}
/**
* Sets weights.
*
* @param f the f
* @return the weights
*/
@Nonnull
public ReLuActivationLayer setWeights(@Nonnull final DoubleSupplier f) {
Arrays.parallelSetAll(weights.getData(), i -> f.getAsDouble());
return this;
}
@Nonnull
@Override
public List state() {
return Arrays.asList(weights.getData());
}
}