79 lines
2.8 KiB
C++
79 lines
2.8 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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// @author Yurii Shyrma (iuriish@yahoo.com)
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//
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#include <array/ResultSet.h>
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#include <ops/declarable/helpers/matrixSetDiag.h>
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#include <execution/Threads.h>
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namespace sd {
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namespace ops {
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namespace helpers {
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//////////////////////////////////////////////////////////////////////////
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template<typename T>
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void matrixSetDiag_(const NDArray& input, const NDArray& diagonal, NDArray& output, const bool zeroPad) {
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// input and output are the same array (x == z) when zeroPad = true
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// xRank = zRank, xRank = yRank + 1
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// xLen = zLen
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const T* x = input.bufferAsT<T>();
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const T* y = diagonal.bufferAsT<T>();
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T* z = output.bufferAsT<T>();
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const Nd4jLong* xShapeInfo = input.shapeInfo();
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const Nd4jLong* yShapeInfo = diagonal.shapeInfo();
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const Nd4jLong* zShapeInfo = output.shapeInfo();
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const bool areSameOffsets = shape::haveSameShapeAndStrides(xShapeInfo, zShapeInfo); // shapes are definitely the same, but strides might not
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const int xRank = input.rankOf();
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const auto xLen = input.lengthOf();
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auto func = PRAGMA_THREADS_FOR {
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int coords[MAX_RANK];
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for (Nd4jLong i = 0; i < xLen; ++i) {
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shape::index2coordsCPU(start, i, xShapeInfo, coords);
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const auto xOffset = shape::getOffset(xShapeInfo, coords);
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const auto zOffset = areSameOffsets ? xOffset : shape::getOffset(zShapeInfo, coords);
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// condition to be on diagonal of innermost matrix
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if (coords[xRank - 2] == coords[xRank - 1])
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z[zOffset] = y[shape::getOffset(yShapeInfo, coords)];
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else
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z[zOffset] = zeroPad ? static_cast<T>(0) : x[xOffset];
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}
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};
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samediff::Threads::parallel_for(func, 0, xLen);
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}
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//////////////////////////////////////////////////////////////////////////
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void matrixSetDiag(sd::LaunchContext* context, const NDArray& input, const NDArray& diagonal, NDArray& output, const bool zeroPad) {
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BUILD_SINGLE_SELECTOR(input.dataType(), matrixSetDiag_, (input, diagonal, output, zeroPad), LIBND4J_TYPES);
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}
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}
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}
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} |