125 lines
4.5 KiB
C++
125 lines
4.5 KiB
C++
/*******************************************************************************
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* Copyright (c) 2015-2018 Skymind, Inc.
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*
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* This program and the accompanying materials are made available under the
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* terms of the Apache License, Version 2.0 which is available at
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* https://www.apache.org/licenses/LICENSE-2.0.
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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* SPDX-License-Identifier: Apache-2.0
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******************************************************************************/
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//
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// Created by george@skymind.io on 6/1/2018.
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// @author Yurii Shyrma (iuriish@yahoo.com)
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//
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#include <ops/declarable/helpers/axis.h>
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#include <ops/declarable/CustomOperations.h>
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namespace nd4j {
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namespace ops {
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#if NOT_EXCLUDED(OP_reduce_dot_bp)
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////////////////////////////////////////////////////////////////////////////////
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CUSTOM_OP_IMPL(reduce_dot_bp, 3, 2, false, 0, 0) {
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auto x = INPUT_VARIABLE(0);
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auto y = INPUT_VARIABLE(1);
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auto gradO = INPUT_VARIABLE(2);
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auto gradX = OUTPUT_VARIABLE(0);
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auto gradY = OUTPUT_VARIABLE(1);
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// L(x,y) = SUM(x_i * y_i)
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// dL/dx_i = y_i
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REQUIRE_TRUE(x->isSameShape(y), 0, "REDUCE_DOT_BP OP: both input arrays x and y should have same shapes, but got %s and %s correspondingly", ShapeUtils::shapeAsString(x).c_str(), ShapeUtils::shapeAsString(y).c_str());
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if (gradO->lengthOf() == 1) { // scalar of reduced to scalar with keep dimensions
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gradX->assign((*y) * (*gradO));
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gradY->assign((*x) * (*gradO));
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}
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else {
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bool keepDims = false;
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auto dimensions = *block.getIArguments();
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if (block.width() > 3) {
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auto axesVector = INPUT_VARIABLE(3);
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helpers::adjustAxis(x->rankOf(), axesVector, dimensions);
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}
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if (block.getBArguments()->size())
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keepDims = B_ARG(0);
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else if (block.getTArguments()->size())
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keepDims = (bool)T_ARG(0);
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REQUIRE_TRUE(dimensions.size() <= x->rankOf(), 0, "REDUCE_DOT_BP OP: the number of dimensions to reduce along must be <= input array rank, but got %i instead" , dimensions.size());
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for(const auto& item : dimensions)
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REQUIRE_TRUE(item >= -x->rankOf() && item < x->rankOf(), 0, "REDUCE_DOT_BP OP: the input dimension to reduce along must be in range [-%i, %i), but got %i instead !" , x->rankOf(), x->rankOf(), item);
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if(!keepDims) {
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auto gradOShapeKeepDims = ShapeUtils::evalReduceShapeInfo(gradO->ordering(), dimensions, *x, true, false, block.getWorkspace());
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auto r = gradO->reshape(gradO->ordering(), ShapeUtils::pullShapeFromShapeInfo(gradOShapeKeepDims)); // for example could be something like [a,b] -> [1,a,1,b]
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gradX->assign((*y) * r);
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gradY->assign((*x) * r);
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}
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else {
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gradX->assign((*y) * (*gradO));
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gradY->assign((*x) * (*gradO));
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}
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}
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return Status::OK();
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}
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DECLARE_SHAPE_FN(reduce_dot_bp) {
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if(shape::length(inputShape->at(2)) > 1) {
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bool keepDims = false;
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auto dimensions = *block.getIArguments();
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if (block.width() > 3) {
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auto axesVector = INPUT_VARIABLE(3);
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helpers::adjustAxis(INPUT_VARIABLE(0)->rankOf(), axesVector, dimensions);
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}
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if (block.getBArguments()->size())
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keepDims = B_ARG(0);
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else if (block.getTArguments()->size())
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keepDims = (bool)T_ARG(0);
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REQUIRE_TRUE(dimensions.size() <= inputShape->at(0)[0], 0, "REDUCE_DOT_BP OP: the number of dimensions to reduce along must be <= input array rank, but got %i instead" , dimensions.size());
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for(const auto& item : dimensions)
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REQUIRE_TRUE(item >= -inputShape->at(0)[0] && item < inputShape->at(0)[0], 0, "REDUCE_DOT_BP OP: the input dimension to reduce along must be in range [-%i, %i), but got %i instead !" , inputShape->at(0)[0], inputShape->at(0)[0], item);
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}
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Nd4jLong *outShapeInfo1, *outShapeInfo2;
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COPY_SHAPE(inputShape->at(0), outShapeInfo1);
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COPY_SHAPE(inputShape->at(1), outShapeInfo2);
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return SHAPELIST(CONSTANT(outShapeInfo1), CONSTANT(outShapeInfo2));
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}
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DECLARE_TYPES(reduce_dot_bp) {
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getOpDescriptor()
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->setAllowedInputTypes(nd4j::DataType::ANY)
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->setAllowedOutputTypes({ALL_FLOATS});
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}
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#endif
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}
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}
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