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/*
* ******************************************************************************
* *
* *
* * 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.
* *
* * See the NOTICE file distributed with this work for additional
* * information regarding copyright ownership.
* * 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.layers.recurrent.weights;
import lombok.Builder;
import lombok.Data;
import lombok.EqualsAndHashCode;
import org.nd4j.autodiff.samediff.SDVariable;
import org.nd4j.common.base.Preconditions;
import org.nd4j.linalg.api.ndarray.INDArray;
import org.nd4j.linalg.api.ops.impl.layers.recurrent.LSTMLayer;
import org.nd4j.common.util.ArrayUtil;
@EqualsAndHashCode(callSuper = true)
@Data
@Builder
public class LSTMLayerWeights extends RNNWeights {
/**
* Input to hidden weights with a shape of [inSize, 4*numUnits].
*
* Input to hidden and hidden to hidden are concatenated in dimension 0,
* so the input to hidden weights are [:inSize, :] and the hidden to hidden weights are [inSize:, :].
*/
private SDVariable weights;
private INDArray iWeights;
/**
* hidden to hidden weights (aka "recurrent weights", with a shape of [numUnits, 4*numUnits].
*
*/
private SDVariable rWeights;
private INDArray irWeights;
/**
* Peephole weights, with a shape of [3*numUnits].
*/
private SDVariable peepholeWeights;
private INDArray iPeepholeWeights;
/**
* Input to hidden and hidden to hidden biases, with shape [4*numUnits].
*/
private SDVariable bias;
private INDArray iBias;
@Override
public SDVariable[] args() {
return filterNonNull(weights, rWeights, peepholeWeights, bias);
}
@Override
public INDArray[] arrayArgs() {
return filterNonNull(iWeights, irWeights, iPeepholeWeights, iBias);
}
@Override
public SDVariable[] argsWithInputs(SDVariable... inputs){
Preconditions.checkArgument(inputs.length == 4, "Expected 4 inputs, got %s", inputs.length); //Order: x, seqLen, yLast, cLast
//lstmLayer c++ op expects: x, Wx, Wr, Wp, b, seqLen, yLast, cLast
return ArrayUtil.filterNull(inputs[0], weights, rWeights, bias, inputs[1], inputs[2], inputs[3], peepholeWeights);
}
@Override
public INDArray[] argsWithInputs(INDArray... inputs) {
Preconditions.checkArgument(inputs.length == 4, "Expected 4 inputs, got %s", inputs.length); //Order: x, seqLen, yLast, cLast
//lstmLayer c++ op expects: x, Wx, Wr, Wp, b, seqLen, yLast, cLast
return ArrayUtil.filterNull(inputs[0], iWeights, irWeights, iBias, inputs[1], inputs[2], inputs[3], iPeepholeWeights);
}
public boolean hasBias() {
return (bias!=null || iBias!=null);
}
public boolean hasPH() {
return (peepholeWeights!=null||iPeepholeWeights!=null);
}
}