cavis/libnd4j/include/loops/cuda/specials/tearKernel.cu

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2019-06-06 14:21:15 +02:00
/*******************************************************************************
* 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 raver119@gmail.com
// @author Yurii Shyrma, created on 15.11.2018
//
#include <loops/special_kernels.h>
namespace nd4j {
////////////////////////////////////////////////////////////////////////
template<typename T>
__device__ void
tearKernel(void *vx, Nd4jLong *xShapeInfo, Nd4jPointer *targets, Nd4jLong *zShapeInfo, Nd4jLong *tadShapeInfo,
Nd4jLong *tadOffsets) {
__shared__ Nd4jLong tadLength;
__shared__ int tadEWS;
__shared__ int zEWS;
// __shared__ int tadRank;
__shared__ Nd4jLong numTads;
// __shared__ int zRank;
// __shared__ Nd4jLong *tadShape;
// __shared__ Nd4jLong *tadStride;
// __shared__ Nd4jLong *zShape;
// __shared__ Nd4jLong *zStride;
__shared__ T* x;
if (threadIdx.x == 0) {
tadLength = shape::length(tadShapeInfo);
tadEWS = shape::elementWiseStride(tadShapeInfo);
zEWS = shape::elementWiseStride(zShapeInfo);
numTads = shape::length(xShapeInfo) / tadLength;
x = static_cast<T *>(vx);
}
__syncthreads();
for (Nd4jLong r = blockIdx.x; r < numTads; r += gridDim.x) {
T *z = (T *) targets[r];
T *s = x + tadOffsets[r];
if (zEWS > 0 && tadEWS > 0) {
for (Nd4jLong i = threadIdx.x; i < tadLength; i += blockDim.x)
z[i * zEWS] = s[i * tadEWS];
} else {
for (Nd4jLong j = threadIdx.x; j < tadLength; j += blockDim.x) {
auto xOffset = shape::getIndexOffset(j, tadShapeInfo);
auto zOffset = shape::getIndexOffset(j, zShapeInfo);
2019-06-06 14:21:15 +02:00
z[zOffset] = s[xOffset];
}
}
}
}
////////////////////////////////////////////////////////////////////////
template<typename T>
__global__ void
execTearKernel(void *vx, Nd4jLong *xShapeInfo, Nd4jPointer *targets, Nd4jLong *zShapeInfo, Nd4jLong *tadShapeInfo,
Nd4jLong *tadOffsets) {
tearKernel<T>(vx, xShapeInfo, targets, zShapeInfo, tadShapeInfo, tadOffsets);
}
////////////////////////////////////////////////////////////////////////
template<typename T>
__host__ void tearKernelGeneric(dim3 &launchDims, cudaStream_t *stream,
void *vx, Nd4jLong *xShapeInfo,
Nd4jPointer *targets, Nd4jLong *zShapeInfo,
Nd4jLong *tadShapeInfo, Nd4jLong *tadOffsets) {
execTearKernel<T><<<launchDims.x, launchDims.y, launchDims.z, *stream>>>(vx, xShapeInfo, targets, zShapeInfo, tadShapeInfo, tadOffsets);
nd4j::DebugHelper::checkErrorCode(stream, "tear(...) failed");
}
BUILD_SINGLE_TEMPLATE(template void ND4J_EXPORT tearKernelGeneric, (dim3 & launchDims, cudaStream_t * stream, void * vx, Nd4jLong * xShapeInfo, Nd4jPointer *targets, Nd4jLong * zShapeInfo, Nd4jLong * tadShapeInfo, Nd4jLong * tadOffsets), LIBND4J_TYPES);
}