cavis/libnd4j/include/ops/declarable/helpers/cpu/matrixSetDiag.cpp

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/*******************************************************************************
* Copyright (c) 2015-2018 Skymind, Inc.
*
* 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.
*
* 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
******************************************************************************/
//
// @author Yurii Shyrma (iuriish@yahoo.com)
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//
#include "ResultSet.h"
#include <ops/declarable/helpers/matrixSetDiag.h>
namespace nd4j {
namespace ops {
namespace helpers {
//////////////////////////////////////////////////////////////////////////
template<typename T>
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
// xRank = zRank, xRank = yRank + 1
// xLen = zLen
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const T* x = input.bufferAsT<T>();
const T* y = diagonal.bufferAsT<T>();
T* z = output.bufferAsT<T>();
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const Nd4jLong* xShapeInfo = input.getShapeInfo();
const Nd4jLong* yShapeInfo = diagonal.getShapeInfo();
const Nd4jLong* zShapeInfo = output.getShapeInfo();
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const bool areSameOffsets = shape::haveSameShapeAndStrides(xShapeInfo, zShapeInfo); // shapes are definitely the same, but strides might not
const int xRank = input.rankOf();
const auto xLen = input.lengthOf();
std::vector<Nd4jLong> coords(xRank); // we use the same coordinates storage both for input and output since their ranks are the same
PRAGMA_OMP_PARALLEL_FOR_ARGS(firstprivate(coords))
for (Nd4jLong i = 0; i < xLen; ++i) {
shape::index2coords(i, xShapeInfo, coords.data());
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const auto xOffset = shape::getOffset(xShapeInfo, coords.data());
const auto zOffset = areSameOffsets ? xOffset : shape::getOffset(zShapeInfo, coords.data());
// condition to be on diagonal of innermost matrix
if(coords[xRank - 2] == coords[xRank - 1])
z[zOffset] = y[shape::getOffset(yShapeInfo, coords.data())];
else
z[zOffset] = zeroPad ? static_cast<T>(0) : x[xOffset];
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}
}
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//////////////////////////////////////////////////////////////////////////
void matrixSetDiag(nd4j::LaunchContext* context, const NDArray& input, const NDArray& diagonal, NDArray& output, const bool zeroPad) {
BUILD_SINGLE_SELECTOR(input.dataType(), matrixSetDiag_, (input, diagonal, output, zeroPad), LIBND4J_TYPES);
}
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}
}
}