78 lines
2.9 KiB
Plaintext
78 lines
2.9 KiB
Plaintext
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/*******************************************************************************
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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 raver119@gmail.com
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// @author Yurii Shyrma, created on 27.11.2018
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//
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#include <loops/special_kernels.h>
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namespace nd4j {
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////////////////////////////////////////////////////////////////////////
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template <typename T>
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__global__ void flattenKernel(
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Nd4jPointer *extraPointers,
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int dOffset,
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char order,
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void *vz, Nd4jLong *zShapeInfo,
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void *vy, Nd4jLong *yShapeInfo) {
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auto z = reinterpret_cast<T*>(vz);
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auto y = reinterpret_cast<T*>(vy);
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__shared__ Nd4jLong lenY, yOrder, zEWS, yEWS;
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if (threadIdx.x == 0) {
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yEWS = shape::elementWiseStride(yShapeInfo);
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zEWS = shape::elementWiseStride(zShapeInfo);
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lenY = shape::length(yShapeInfo);
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}
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__syncthreads();
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Nd4jLong tid = blockIdx.x * blockDim.x + threadIdx.x;
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if (zEWS >= 1 && yEWS >= 1 && yOrder == order) {
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for (int i = tid; i < lenY; i += gridDim.x * blockDim.x)
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z[i * zEWS + dOffset] = y[i * yEWS];
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}
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else {
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for(auto i = tid; i < lenY; i += gridDim.x * blockDim.x)
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z[i * zEWS + dOffset] = y[shape::getIndexOrderOffset(i, yShapeInfo, lenY, order)];
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}
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}
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////////////////////////////////////////////////////////////////////////
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template <typename T>
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__host__ void flattenKernelGeneric(dim3& launchDims, cudaStream_t *stream,
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Nd4jPointer *extraPointers,
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int dOffset,
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char order,
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void *vz, Nd4jLong *zShapeInfo,
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void *vy, Nd4jLong *yShapeInfo) {
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flattenKernel<T><<<launchDims.x, launchDims.y, launchDims.z, *stream>>>(extraPointers, dOffset, order, vz, zShapeInfo, vy, yShapeInfo);
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nd4j::DebugHelper::checkErrorCode(stream, "flattenGeneric(...) failed");
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}
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BUILD_SINGLE_TEMPLATE(template void ND4J_EXPORT flattenKernelGeneric, (dim3& launchDims, cudaStream_t *stream, Nd4jPointer *extraPointers, int dOffset, char order, void *vz, Nd4jLong *zShapeInfo, void *vy, Nd4jLong *yShapeInfo), LIBND4J_TYPES);
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}
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