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deeplearning4j--deeplearning4j/libnd4j/include/ops/declarable/helpers/cpu/invertPermutation.cpp
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2026-07-13 12:47:05 +08:00

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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
******************************************************************************/
//
// @author Yurii Shyrma (iuriish@yahoo.com), created on 20.04.2018
//
#include <helpers/Loops.h>
#include <ops/declarable/helpers/transforms.h>
#if NOT_EXCLUDED(OP_invert_permutation)
namespace sd {
namespace ops {
namespace helpers {
////////////////////////////////////////////////////////////////////////
void invertPermutation(sd::LaunchContext* context, NDArray& input, NDArray& output) {
std::set<int> uniqueElems;
const int length = input.lengthOf();
for (int i = 0; i < length; ++i) {
int elem = input.e<int>(i);
if (!uniqueElems.insert(elem).second) // this operation forbids us to use #pragma omp
THROW_EXCEPTION("helpers::invertPermutation function: input array contains duplicates !");
if (elem < 0 || elem > length - 1)
THROW_EXCEPTION(
"helpers::invertPermutation function: element of input array is out of range (0, length-1) !");
output.p<int>(elem, i);
}
}
} // namespace helpers
} // namespace ops
} // namespace sd
#endif