/*******************************************************************************
 * 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
//

#include <op_boilerplate.h>
#include <loops/reduce_float.h>
#include <loops/legacy_ops.h>
#include <helpers/DebugHelper.h>


template <typename X, typename Z, typename OpClass>
__device__ void reduceSimpleGeneric(
        void *dx,
        Nd4jLong *xShapeInfo,
        void *extraParams,
        void *result,
        Nd4jLong *resultShapeInfo,
        int *dimension,
        int dimensionLength,
        void *reductionBuffer, Nd4jLong *tadOnlyShapeInfo, Nd4jLong *tadOffsets) {

    __shared__ UnifiedSharedMemory *manager;

    if (threadIdx.x == 0) {
        c __shared__ unsigned char shmem[];
        manager = new(shmem) UnifiedSharedMemory((int *) shmem);
        manager->init(sizeof(UnifiedSharedMemory), 0, sizeof(functions::reduce::ReduceFunction<T>), sizeof(shape::TAD), shape::rank(xShapeInfo));
    }
    __syncthreads();


    functions::reduce::ReduceFunction<T>::template transformCudaXD<OpClass>(
            dx,
            xShapeInfo,
            extraParams,
            result,
            resultShapeInfo,
            dimension,
            dimensionLength,
            reductionBuffer,
            manager,
            tadOnlyShapeInfo,
            tadOffsets);
}

template <typename T, typename OpClass>
__device__ void reduceSimpleGeneric1D(
        T *dx,
        Nd4jLong *xShapeInfo,
        T *extraParams,
        T *result,
        Nd4jLong *resultShapeInfo,
        int *dimension,
        int dimensionLength,
        T *reductionBuffer,
        Nd4jLong *tadOnlyShapeInfo,
        Nd4jLong *tadOffsets) {

    functions::reduce::ReduceFunction<T>::template transformCuda1D<OpClass>(
            dx,
            xShapeInfo,
            extraParams,
            result,
            resultShapeInfo,
            dimension,
            dimensionLength,
            reductionBuffer, nullptr, tadOnlyShapeInfo, tadOffsets);
}

template <typename T, typename OpClass>
__device__ void reduceSimpleGeneric3D(
        T *dx,
        Nd4jLong *xShapeInfo,
        T *extraParams,
        T *result,
        Nd4jLong *resultShapeInfo,
        int *dimension,
        int dimensionLength,
        T *reductionBuffer,
        Nd4jLong *tadOnlyShapeInfo,
        Nd4jLong *tadOffsets) {

    functions::reduce::ReduceFunction<T>::template transformCuda3D<OpClass>(
            dx,
            xShapeInfo,
            extraParams,
            result,
            resultShapeInfo,
            dimension,
            dimensionLength,
            reductionBuffer,
            nullptr,
            tadOnlyShapeInfo,
            tadOffsets);
}

template <typename T, typename OpClass>
__device__ void reduceScalarGeneric(
        T *dx,
        Nd4jLong *xShapeInfo,
        T *extraParams,
        T *result,
        Nd4jLong *resultShapeInfo,
        int *dimension,
        int dimensionLength,
        T *reductionBuffer, Nd4jLong *tadOnlyShapeInfo) {

    __shared__ UnifiedSharedMemory *manager;

    if (threadIdx.x == 0) {
        extern __shared__ unsigned char shmem[];
        manager = new(shmem) UnifiedSharedMemory((int *) shmem);
        manager->init(sizeof(UnifiedSharedMemory), 0, sizeof(functions::reduce::ReduceFunction<T>), sizeof(shape::TAD), 0);
    }
    __syncthreads();

    functions::reduce::ReduceFunction<T>::template execScalarCuda<OpClass>(
            dx,
            xShapeInfo,
            extraParams,
            result,
            resultShapeInfo,
            reductionBuffer,
            manager,
            tadOnlyShapeInfo);
};

#ifndef __CLION_IDE__
// reduceScalar
DISPATCH_KERNEL_SIMPLE(reduceScalarSimple_, reduceScalarGeneric, float, INPUT(float *x, Nd4jLong *xShapeInfo, float *extraParams, float *z, Nd4jLong *zShapeInfo, int *dimension, int dimensionLength, float *reductionBuffer, Nd4jLong *tadOnlyShapeInfo), PARAMS(x, xShapeInfo, extraParams, z, zShapeInfo, dimension, dimensionLength, reductionBuffer, tadOnlyShapeInfo), OPS_A(REDUCE_OPS))
DISPATCH_KERNEL_SIMPLE(reduceScalarSimple_, reduceScalarGeneric, double, INPUT(double *x, Nd4jLong *xShapeInfo, double *extraParams, double *z, Nd4jLong *zShapeInfo, int *dimension, int dimensionLength, double *reductionBuffer, Nd4jLong *tadOnlyShapeInfo), PARAMS(x, xShapeInfo, extraParams, z, zShapeInfo, dimension, dimensionLength, reductionBuffer, tadOnlyShapeInfo), OPS_A(REDUCE_OPS))
DISPATCH_KERNEL_SIMPLE(reduceScalarSimple_, reduceScalarGeneric, float16, INPUT(float16 *x, Nd4jLong *xShapeInfo, float16 *extraParams, float16 *z, Nd4jLong *zShapeInfo, int *dimension, int dimensionLength, float16 *reductionBuffer, Nd4jLong *tadOnlyShapeInfo), PARAMS(x, xShapeInfo, extraParams, z, zShapeInfo, dimension, dimensionLength, reductionBuffer, tadOnlyShapeInfo), OPS_A(REDUCE_OPS))

// reduce1D
DISPATCH_KERNEL_SIMPLE(reduceSimpleGeneric1D_, reduceSimpleGeneric1D, float, INPUT(float *x, Nd4jLong *xShape, float *extraParams, float *z, Nd4jLong *zShape, int *dimension, int dimensionLength, float *reductionPointer, Nd4jLong *tadShapeInfo, Nd4jLong *tadOffsets), PARAMS(x, xShape, extraParams, z, zShape, dimension, dimensionLength, reductionPointer, tadShapeInfo, tadOffsets), OPS_A(REDUCE_OPS))
DISPATCH_KERNEL_SIMPLE(reduceSimpleGeneric1D_, reduceSimpleGeneric1D, double, INPUT(double *x, Nd4jLong *xShape, double *extraParams, double *z, Nd4jLong *zShape, int *dimension, int dimensionLength, double *reductionPointer, Nd4jLong *tadShapeInfo, Nd4jLong *tadOffsets), PARAMS(x, xShape, extraParams, z, zShape, dimension, dimensionLength, reductionPointer, tadShapeInfo, tadOffsets), OPS_A(REDUCE_OPS))
DISPATCH_KERNEL_SIMPLE(reduceSimpleGeneric1D_, reduceSimpleGeneric1D, float16, INPUT(float16 *x, Nd4jLong *xShape, float16 *extraParams, float16 *z, Nd4jLong *zShape, int *dimension, int dimensionLength, float16 *reductionPointer, Nd4jLong *tadShapeInfo, Nd4jLong *tadOffsets), PARAMS(x, xShape, extraParams, z, zShape, dimension, dimensionLength, reductionPointer, tadShapeInfo, tadOffsets), OPS_A(REDUCE_OPS))

// reduce3D
DISPATCH_KERNEL_SIMPLE(reduceSimpleGeneric3D_, reduceSimpleGeneric3D, float, INPUT(float *x, Nd4jLong *xShape, float *extraParams, float *z, Nd4jLong *zShape, int *dimension, int dimensionLength, float *reductionPointer, Nd4jLong *tadShapeInfo, Nd4jLong *tadOffsets), PARAMS(x, xShape, extraParams, z, zShape, dimension, dimensionLength, reductionPointer, tadShapeInfo, tadOffsets), OPS_A(REDUCE_OPS))
DISPATCH_KERNEL_SIMPLE(reduceSimpleGeneric3D_, reduceSimpleGeneric3D, double, INPUT(double *x, Nd4jLong *xShape, double *extraParams, double *z, Nd4jLong *zShape, int *dimension, int dimensionLength, double *reductionPointer, Nd4jLong *tadShapeInfo, Nd4jLong *tadOffsets), PARAMS(x, xShape, extraParams, z, zShape, dimension, dimensionLength, reductionPointer, tadShapeInfo, tadOffsets), OPS_A(REDUCE_OPS))
DISPATCH_KERNEL_SIMPLE(reduceSimpleGeneric3D_, reduceSimpleGeneric3D, float16, INPUT(float16 *x, Nd4jLong *xShape, float16 *extraParams, float16 *z, Nd4jLong *zShape, int *dimension, int dimensionLength, float16 *reductionPointer, Nd4jLong *tadShapeInfo, Nd4jLong *tadOffsets), PARAMS(x, xShape, extraParams, z, zShape, dimension, dimensionLength, reductionPointer, tadShapeInfo, tadOffsets), OPS_A(REDUCE_OPS))

// reduceXD
DISPATCH_KERNEL_SIMPLE(reduceSimpleGenericXD_, reduceSimpleGeneric, float, INPUT(float *x, Nd4jLong *xShape, float *extraParams, float *z, Nd4jLong *zShape, int *dimension, int dimensionLength, float *reductionPointer, Nd4jLong *tadShapeInfo, Nd4jLong *tadOffsets), PARAMS(x, xShape, extraParams, z, zShape, dimension, dimensionLength, reductionPointer, tadShapeInfo, tadOffsets), OPS_A(REDUCE_OPS))
DISPATCH_KERNEL_SIMPLE(reduceSimpleGenericXD_, reduceSimpleGeneric, double, INPUT(double *x, Nd4jLong *xShape, double *extraParams, double *z, Nd4jLong *zShape, int *dimension, int dimensionLength, double *reductionPointer, Nd4jLong *tadShapeInfo, Nd4jLong *tadOffsets), PARAMS(x, xShape, extraParams, z, zShape, dimension, dimensionLength, reductionPointer, tadShapeInfo, tadOffsets), OPS_A(REDUCE_OPS))
DISPATCH_KERNEL_SIMPLE(reduceSimpleGenericXD_, reduceSimpleGeneric, float16, INPUT(float16 *x, Nd4jLong *xShape, float16 *extraParams, float16 *z, Nd4jLong *zShape, int *dimension, int dimensionLength, float16 *reductionPointer, Nd4jLong *tadShapeInfo, Nd4jLong *tadOffsets), PARAMS(x, xShape, extraParams, z, zShape, dimension, dimensionLength, reductionPointer, tadShapeInfo, tadOffsets), OPS_A(REDUCE_OPS))

#endif

namespace functions {
    namespace reduce {

            template <>
            _CUDA_H void ReduceFunction<float>::execReduceScalar(dim3 launchDims, cudaStream_t *stream, int opNum, float *x, Nd4jLong *xShapeInfo, float *extraParams, float *z, Nd4jLong *zShapeInfo, int *dimension, int dimensionLength, float *reductionBuffer, Nd4jLong *tadOnlyShapeInfo) {
                
                DISPATCH_SIMPLE(reduceScalarSimple, float, PARAMS(x, xShapeInfo, extraParams, z, zShapeInfo, nullptr, 1, reductionBuffer, tadOnlyShapeInfo), OPS_A(REDUCE_OPS))

				nd4j::DebugHelper::checkErrorCode(stream, "execReduceScalarFloat(...) failed");
            }

            template <>
            _CUDA_H void ReduceFunction<float16>::execReduceScalar(dim3 launchDims, cudaStream_t *stream, int opNum, float16 *x, Nd4jLong *xShapeInfo, float16 *extraParams, float16 *z, Nd4jLong *zShapeInfo, int *dimension, int dimensionLength, float16 *reductionBuffer, Nd4jLong *tadOnlyShapeInfo) {
                
                DISPATCH_SIMPLE(reduceScalarSimple, float16, PARAMS(x, xShapeInfo, extraParams, z, zShapeInfo, nullptr, 1, reductionBuffer, tadOnlyShapeInfo), OPS_A(REDUCE_OPS))

				nd4j::DebugHelper::checkErrorCode(stream, "execReduceScalarHalf(...) failed");
            }

            template <>
            _CUDA_H void ReduceFunction<double>::execReduceScalar(dim3 launchDims, cudaStream_t *stream, int opNum, double *x, Nd4jLong *xShapeInfo, double *extraParams, double *z, Nd4jLong *zShapeInfo, int *dimension, int dimensionLength, double *reductionBuffer, Nd4jLong *tadOnlyShapeInfo) {
                
                DISPATCH_SIMPLE(reduceScalarSimple, double, PARAMS(x, xShapeInfo, extraParams, z, zShapeInfo, nullptr, 1, reductionBuffer, tadOnlyShapeInfo), OPS_A(REDUCE_OPS))

				nd4j::DebugHelper::checkErrorCode(stream, "execReduceScalarDouble(...) failed");
            }

            template <>
            _CUDA_H void ReduceFunction<float>::execReduceXD(dim3 launchDims, cudaStream_t *stream, int opNum, int rank, float *x, Nd4jLong *xShape, float *extraParams, float *z, Nd4jLong *zShape, int *dimension, int dimensionLength, float *reductionPointer, Nd4jLong *tadShapeInfo, Nd4jLong *tadOffsets) {
                if (rank == 1) {
                    DISPATCH_SIMPLE(reduceSimpleGeneric1D, float, PARAMS(x, xShape, extraParams, z, zShape, dimension, dimensionLength, reductionPointer, tadShapeInfo, tadOffsets), OPS_A(REDUCE_OPS))
                } else if (rank <= 3) {
                    DISPATCH_SIMPLE(reduceSimpleGeneric3D, float, PARAMS(x, xShape, extraParams, z, zShape, dimension, dimensionLength, reductionPointer, tadShapeInfo, tadOffsets), OPS_A(REDUCE_OPS))
                } else {
                    DISPATCH_SIMPLE(reduceSimpleGenericXD, float, PARAMS(x, xShape, extraParams, z, zShape, dimension, dimensionLength, reductionPointer, tadShapeInfo, tadOffsets), OPS_A(REDUCE_OPS))
                }

                DEBUG_KERNEL(stream, opNum);
            }

            template <>
            _CUDA_H void ReduceFunction<float16>::execReduceXD(dim3 launchDims, cudaStream_t *stream, int opNum, int rank, float16 *x, Nd4jLong *xShape, float16 *extraParams, float16 *z, Nd4jLong *zShape, int *dimension, int dimensionLength, float16 *reductionPointer, Nd4jLong *tadShapeInfo, Nd4jLong *tadOffsets) {
                if (rank == 1) {
                    DISPATCH_SIMPLE(reduceSimpleGeneric1D, float16, PARAMS(x, xShape, extraParams, z, zShape, dimension, dimensionLength, reductionPointer, tadShapeInfo, tadOffsets), OPS_A(REDUCE_OPS))
                } else if (rank <= 3) {
                    DISPATCH_SIMPLE(reduceSimpleGeneric3D, float16, PARAMS(x, xShape, extraParams, z, zShape, dimension, dimensionLength, reductionPointer, tadShapeInfo, tadOffsets), OPS_A(REDUCE_OPS))
                } else {
                    DISPATCH_SIMPLE(reduceSimpleGenericXD, float16, PARAMS(x, xShape, extraParams, z, zShape, dimension, dimensionLength, reductionPointer, tadShapeInfo, tadOffsets), OPS_A(REDUCE_OPS))
                }

                DEBUG_KERNEL(stream, opNum);
            }

            template <>
            _CUDA_H void ReduceFunction<double>::execReduceXD(dim3 launchDims, cudaStream_t *stream, int opNum, int rank, double *x, Nd4jLong *xShape, double *extraParams, double *z, Nd4jLong *zShape, int *dimension, int dimensionLength, double *reductionPointer, Nd4jLong *tadShapeInfo, Nd4jLong *tadOffsets) {

                if (rank == 1) {
                    DISPATCH_SIMPLE(reduceSimpleGeneric1D, double, PARAMS(x, xShape, extraParams, z, zShape, dimension, dimensionLength, reductionPointer, tadShapeInfo, tadOffsets), OPS_A(REDUCE_OPS))
                } else if (rank <= 3) {
                    DISPATCH_SIMPLE(reduceSimpleGeneric3D, double, PARAMS(x, xShape, extraParams, z, zShape, dimension, dimensionLength, reductionPointer, tadShapeInfo, tadOffsets), OPS_A(REDUCE_OPS))
                } else {
                    DISPATCH_SIMPLE(reduceSimpleGenericXD, double, PARAMS(x, xShape, extraParams, z, zShape, dimension, dimensionLength, reductionPointer, tadShapeInfo, tadOffsets), OPS_A(REDUCE_OPS))
                }

                DEBUG_KERNEL(stream, opNum);
            }

            template <typename T>
            __device__ void initializeShared(T *extraParams, T **sPartials, int sMemSize) {
                int sPartialsLength = sMemSize / sizeof(T);
                T *sPartialsDeref = (T *) *sPartials;
                for (int i = 0; i < sPartialsLength; i++) {
                    sPartialsDeref[i] = extraParams[0];
                }
            }

            template <typename T>
            template <typename OpType>
			__device__ void ReduceFunction<T>::transformCuda1D(T *dx,
				Nd4jLong *xShapeInfo,
				T *extraParams,
				T *result,
				Nd4jLong *resultShapeInfo,
				int *dimension,
				int dimensionLength,
				T *reductionBuffer, UnifiedSharedMemory *manager, Nd4jLong *tadOnlyShapeInfo, Nd4jLong *tadOffsets) {

                if (OpType::requiresSpecialAccumulation) {
                    OpType::execSpecialCuda(dx, xShapeInfo, extraParams, result, resultShapeInfo, dimension, dimensionLength, reductionBuffer, manager, tadOnlyShapeInfo, tadOffsets);
                    return;
                }

				//shared memory space for storing intermediate results
				__shared__ T *sPartials;// = (T *)manager->getSharedReductionBuffer();
				__shared__ int tadLength;
				__shared__ int tadEWS;
				__shared__ int numTads;
				if (threadIdx.x == 0) {
                    extern __shared__ unsigned char shmem[];
                    sPartials = (T *) shmem;
					tadLength = shape::length(tadOnlyShapeInfo);//shape::tadLength(xShapeInfo, dimension, dimensionLength);
					tadEWS = shape::elementWiseStride(tadOnlyShapeInfo);
					numTads = shape::length(xShapeInfo) / tadLength;
				}
				__syncthreads();

				for (int r = blockIdx.x; r < numTads; r += gridDim.x) {
					Nd4jLong tadOffsetForBlock = tadOffsets[r];
					T *rX = dx + tadOffsetForBlock;

					sPartials[threadIdx.x] = OpType::startingValue(rX);

                    if (tadEWS >= 1) {
					    for (int i = threadIdx.x; i < tadLength; i += blockDim.x) {
						    sPartials[threadIdx.x] = OpType::update(sPartials[threadIdx.x], OpType::op(rX[i * tadEWS], extraParams), extraParams);
					    }
					} else {
                        __shared__ int tadRank;
				        __shared__ Nd4jLong *tadShape;
				        __shared__ Nd4jLong *tadStride;
				        Nd4jLong xCoord[MAX_RANK];
				        if (threadIdx.x == 0) {
                            tadRank = shape::rank(tadOnlyShapeInfo);
                            tadShape = shape::shapeOf(tadOnlyShapeInfo);
                            tadStride = shape::stride(tadOnlyShapeInfo);
				        }
    				    __syncthreads();

                        for (int i = threadIdx.x; i < tadLength; i += blockDim.x) {
						    shape::ind2subC(tadRank, tadShape, i, tadLength, xCoord);
						    auto xOffset = shape::getOffset(tadOffsetForBlock, tadShape, tadStride, xCoord, tadRank);

						    sPartials[threadIdx.x] = OpType::update(sPartials[threadIdx.x], OpType::op(dx[xOffset], extraParams), extraParams);
					    }
					}


					__syncthreads();

					// aggregate. do NOT reduce for elements > tadLength
					aggregatePartials<OpType>(sPartials, threadIdx.x, nd4j::math::nd4j_min<int>(blockDim.x, tadLength), extraParams);


					__syncthreads();
					if (threadIdx.x == 0) {
						result[r] = OpType::postProcess(sPartials[threadIdx.x], tadLength, extraParams);
					}
				}
			}


            template <typename T>
            template <typename OpType>
			__device__ void ReduceFunction<T>::execScalarCuda(
				T *dx,
				Nd4jLong *xShapeInfo,
				T *extraParams,
				T *result,
				Nd4jLong *resultShapeInfo,
				T *reductionBuffer,
				UnifiedSharedMemory *manager,
				Nd4jLong *tadOnlyShapeInfo) {
				int elementWiseStride = shape::elementWiseStride(xShapeInfo);

				auto n = shape::length(xShapeInfo);

				auto tid = blockDim.x * blockIdx.x + threadIdx.x;

				//shared memory space for storing intermediate results
				T *sPartials = (T *)manager->getSharedReductionBuffer();

				sPartials[threadIdx.x] = OpType::startingValue(dx);

				if (elementWiseStride >= 1) {
					for (int i = tid; i < n; i += (blockDim.x * gridDim.x)) {
						sPartials[threadIdx.x] = OpType::update(sPartials[threadIdx.x], OpType::op(dx[i * elementWiseStride], extraParams), extraParams);
					}
				}
				else {
				    __shared__ int rank;
				    __shared__ Nd4jLong *xShape;
				    __shared__ Nd4jLong *xStride;
				    if (threadIdx.x == 0) {
                        rank = shape::rank(xShapeInfo);
                        xShape = shape::shapeOf(xShapeInfo);
                        xStride = shape::stride(xShapeInfo);
				    }
				    __syncthreads();

					Nd4jLong ind2sub[MAX_RANK];

					for (int i = tid; i < n; i += blockDim.x * gridDim.x) {
						shape::ind2subC(rank, xShape, i, n, ind2sub);

						auto offset = shape::getOffset(0, xShape, xStride, ind2sub, rank);
						sPartials[threadIdx.x] = OpType::update(sPartials[threadIdx.x], OpType::op(dx[offset], extraParams), extraParams);
					}
				}

				__syncthreads();
				aggregatePartials<OpType>(sPartials, threadIdx.x, nd4j::math::nd4j_min<int>(blockDim.x, n), extraParams);


				__syncthreads();

				if (gridDim.x > 1) {
					unsigned int *tc = (unsigned int *)reductionBuffer;
					__shared__ bool amLast;
					tid = threadIdx.x;
					if (threadIdx.x == 0) {
						reductionBuffer[blockIdx.x] = sPartials[0];//this->postProcess(sPartials[0],n,extraParams);
					}
					__threadfence();
					__syncthreads();

					if (threadIdx.x == 0) {
						unsigned int ticket = atomicInc(&tc[16384], gridDim.x);
						amLast = (ticket == gridDim.x - 1);
					}

					__syncthreads();

					if (amLast) {
						tc[16384] = 0;

						sPartials[threadIdx.x] = OpType::startingValue(dx);

						for (int i = threadIdx.x; i < gridDim.x; i += blockDim.x) {
							sPartials[threadIdx.x] = OpType::update(sPartials[threadIdx.x], reductionBuffer[i], extraParams);
						}
						__syncthreads();



						aggregatePartials<OpType>(sPartials, threadIdx.x, nd4j::math::nd4j_min<int>(gridDim.x, blockDim.x), extraParams);

						__syncthreads();
						if (threadIdx.x == 0) {
							result[0] = OpType::postProcess(sPartials[0], n, extraParams);
						}
					}
				}
				else {
					if (threadIdx.x == 0) {
						unsigned int *tc = (unsigned *)reductionBuffer;
						tc[16384] = 0;
						result[0] = OpType::postProcess(sPartials[0], n, extraParams);
					}
				}
			}

            template <typename T>
            template <typename OpType>
			__device__ void ReduceFunction<T>::transformCuda3D(
				T *dx,
				Nd4jLong *xShapeInfo,
				T *extraParams,
				T *result,
				Nd4jLong *resultShapeInfo,
				int *dimension,
				int dimensionLength,
				T *reductionBuffer, UnifiedSharedMemory *manager, Nd4jLong *tadOnlyShapeInfo, Nd4jLong *tadOffsets) {

                if (OpType::requiresSpecialAccumulation) {
                    OpType::execSpecialCuda(dx, xShapeInfo, extraParams, result, resultShapeInfo, dimension, dimensionLength, reductionBuffer, manager, tadOnlyShapeInfo, tadOffsets);
                    return;
                }

				//shared memory space for storing intermediate results
				__shared__ T *sPartials; // = (T *)manager->getSharedReductionBuffer();

				__shared__ int tadLength;
				__shared__ int tadRank;
				__shared__ int numTads;
				__shared__ Nd4jLong *tadShape;
				__shared__ Nd4jLong *tadStride;
				if (threadIdx.x == 0) {
				    extern __shared__ unsigned char shmem[];
				    sPartials = (T *) shmem;
					tadLength = shape::length(tadOnlyShapeInfo);//shape::tadLength(xShapeInfo, dimension, dimensionLength);
					tadRank = shape::rank(tadOnlyShapeInfo);
					numTads = shape::length(xShapeInfo) / tadLength;

					tadShape = shape::shapeOf(tadOnlyShapeInfo);
					tadStride = shape::stride(tadOnlyShapeInfo);
				}
				__syncthreads();

				Nd4jLong xCoord[3];

				for (int r = blockIdx.x; r < numTads; r += gridDim.x) {
					Nd4jLong tadOffsetForBlock = tadOffsets[r];

					sPartials[threadIdx.x] = OpType::startingValue(dx + tadOffsetForBlock);

					for (int i = threadIdx.x; i < tadLength; i += blockDim.x) {
						shape::ind2subC(tadRank, tadShape, i, tadLength, xCoord);
						auto xOffset = shape::getOffset(tadOffsetForBlock, tadShape, tadStride, xCoord, tadRank);

						sPartials[threadIdx.x] = OpType::update(sPartials[threadIdx.x], OpType::op(dx[xOffset], extraParams), extraParams);
					}
					__syncthreads();

					// aggregate. do NOT reduce for elements > tadLength
					aggregatePartials<OpType>(sPartials, threadIdx.x, nd4j::math::nd4j_min<int>(blockDim.x, tadLength), extraParams);

					__syncthreads();
					if (threadIdx.x == 0)
						result[r] = OpType::postProcess(sPartials[threadIdx.x], tadLength, extraParams);
				}
			}

            template <typename T>
            template <typename OpType>
			__device__ void ReduceFunction<T>::transformCudaXD(
				T *dx,
				Nd4jLong *xShapeInfo,
				T *extraParams,
				T *result,
				Nd4jLong *resultShapeInfo,
				int *dimension,
				int dimensionLength,
				T *reductionBuffer,
				UnifiedSharedMemory *manager,
				Nd4jLong *tadOnlyShapeInfo,
				Nd4jLong *tadOffsets) {

                if (OpType::requiresSpecialAccumulation) {
                    OpType::execSpecialCuda(dx, xShapeInfo, extraParams, result, resultShapeInfo, dimension, dimensionLength, reductionBuffer, manager, tadOnlyShapeInfo, tadOffsets);
                    return;
                }

				//shared memory space for storing intermediate results
				__shared__ T *sPartials;

				//                __shared__ shape::TAD *tad;
				__shared__ int tadLength;
				__shared__ int tadRank;
				__shared__ int numTads;
				__shared__ Nd4jLong *tadShape;
				__shared__ Nd4jLong *tadStride;
				if (threadIdx.x == 0) {
				    extern __shared__ unsigned char shmem[];
				    sPartials = (T *) shmem;
					tadLength = shape::length(tadOnlyShapeInfo);//shape::tadLength(xShapeInfo, dimension, dimensionLength);
					tadRank = shape::rank(tadOnlyShapeInfo);
					numTads = shape::length(xShapeInfo) / tadLength;

					tadShape = shape::shapeOf(tadOnlyShapeInfo);
					tadStride = shape::stride(tadOnlyShapeInfo);
				}
				__syncthreads();

				Nd4jLong xCoord[MAX_RANK];

				for (int r = blockIdx.x; r < numTads; r += gridDim.x) {
					Nd4jLong tadOffsetForBlock = tadOffsets[r];

					sPartials[threadIdx.x] = OpType::startingValue(dx + tadOffsetForBlock);

					for (int i = threadIdx.x; i < tadLength; i += blockDim.x) {
						shape::ind2subC(tadRank, tadShape, i, tadLength, xCoord);
						auto xOffset = shape::getOffset(tadOffsetForBlock, tadShape, tadStride, xCoord, tadRank);

						sPartials[threadIdx.x] = OpType::update(sPartials[threadIdx.x], OpType::op(dx[xOffset], extraParams), extraParams);
					}
					__syncthreads();

					// aggregate. do NOT reduce for elements > tadLength
					aggregatePartials<OpType>(sPartials, threadIdx.x, nd4j::math::nd4j_min<int>(blockDim.x, tadLength), extraParams);


					__syncthreads();
					if (threadIdx.x == 0)
						result[r] = OpType::postProcess(sPartials[threadIdx.x], tadLength, extraParams);
				}
			}

            template <typename T>
            template <typename OpType>
			__device__ void ReduceFunction<T>::aggregatePartials(T *sPartials, Nd4jLong tid, Nd4jLong numItems, T *extraParams) {
				// start the shared memory loop on the next power of 2 less
				// than the block size.  If block size is not a power of 2,
				// accumulate the intermediate sums in the remainder range.
				Nd4jLong floorPow2 = numItems;

				if (floorPow2 & (floorPow2 - 1)) {
					while (floorPow2 & (floorPow2 - 1)) {
						floorPow2 &= floorPow2 - 1;
					}
					if (tid >= floorPow2) {
						sPartials[tid - floorPow2] = OpType::update(sPartials[tid - floorPow2], sPartials[tid], extraParams);
					}

					__syncthreads();
				}


				for (Nd4jLong activeThreads = floorPow2 >> 1; activeThreads; activeThreads >>= 1) {
					if (tid < activeThreads && tid + activeThreads < numItems) {
						sPartials[tid] = OpType::update(sPartials[tid], sPartials[tid + activeThreads], extraParams);
					}
                    __syncthreads();
				}
			}

#ifndef __CLION_IDE__
        BUILD_CALL_1(template __device__ void ReduceFunction<float>::execScalarCuda, float, (float*, Nd4jLong*, float*, float*, Nd4jLong*, float*, UnifiedSharedMemory *, Nd4jLong*), REDUCE_OPS)
        BUILD_CALL_1(template __device__ void ReduceFunction<float16>::execScalarCuda, float16, (float16*, Nd4jLong*, float16*, float16*, Nd4jLong*, float16*, UnifiedSharedMemory *, Nd4jLong*), REDUCE_OPS)
        BUILD_CALL_1(template __device__ void ReduceFunction<double>::execScalarCuda, double, (double*, Nd4jLong*, double*, double*, Nd4jLong*, double*, UnifiedSharedMemory *, Nd4jLong*), REDUCE_OPS)

        BUILD_CALL_1(template __device__ void ReduceFunction<float>::aggregatePartials, float, (float*, Nd4jLong, Nd4jLong, float*), REDUCE_OPS)
        BUILD_CALL_1(template __device__ void ReduceFunction<float16>::aggregatePartials, float16, (float16*, Nd4jLong, Nd4jLong, float16*), REDUCE_OPS)
        BUILD_CALL_1(template __device__ void ReduceFunction<double>::aggregatePartials, double, (double*, Nd4jLong, Nd4jLong, double*), REDUCE_OPS)
#endif
    }
}