Average pool backward deviceOP and example (#797)

* Add avgpool bwd reference code

* Refine naming

* Fix invalid in_element op in ref_conv

* Add example (only reference now)

* Add the full example of avgpool bwd

* Fix copyright

* Imitate MakeDescriptor from  transform_conv_bwd_data_to_gemm_v1.hpp

* rename channel to c from k

* Arrange the code

* Imitate the argument from conv bwd

* Implement invoker

* Fix order of parameter in example

* Refactor reference code for different dimension

* Support different stride

* Check if argument is valid

* Fix kernel parameter for NDHWC, fastest dimension C is not reduced

* Add more data type in example

* Fix bug in example

* calculate Do Ho Wo according to the dilation

* Remove useless header

* Add comment in reference code

* Add layout parameter

* Remove layout in derived class

* Refine reference comment

example/51_avgpool3d_bwd/CMakeLists.txt

+add_example_executable(example_avgpool3d_bwd_bf16 avgpool3d_bwd_bf16.cpp)
+add_example_executable(example_avgpool3d_bwd_fp16 avgpool3d_bwd_fp16.cpp)
+add_example_executable(example_avgpool3d_bwd_fp32 avgpool3d_bwd_fp32.cpp)

example/51_avgpool3d_bwd/avgpool3d_bwd_bf16.cpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2023, Advanced Micro Devices, Inc. All rights reserved.
+
+#include <iostream>
+
+#include "ck/ck.hpp"
+#include "ck/tensor_operation/gpu/device/tensor_layout.hpp"
+#include "ck/tensor_operation/gpu/device/impl/device_avgpool3d_bwd_ndhwc_ndhwc.hpp"
+
+#include "avgpool3d_bwd_common.hpp"
+
+using DOutDataType    = ck::bhalf_t;
+using DInDataType     = ck::bhalf_t;
+using ComputeDataType = float;
+
+#if 1
+using DOutLayout = ck::tensor_layout::convolution::NDHWC;
+using DInLayout  = ck::tensor_layout::convolution::NDHWC;
+#else
+using DOutLayout = ck::tensor_layout::convolution::NCDHW;
+using DInLayout  = ck::tensor_layout::convolution::NCDHW;
+#endif
+
+using DevicePoolBwdInstance =
+    ck::tensor_operation::device::DeviceAvgPool3dBwd_NDHWC_NDHWC<DOutDataType,
+                                                                 DInDataType,
+                                                                 ComputeDataType,
+                                                                 64, // BlockSize
+                                                                 64, // ReduceMThreadClusterSize
+                                                                 1,  // ReduceKThreadClusterSize
+                                                                 1,  // ReduceMThreadSliceSize
+                                                                 1,  // ReduceKThreadSliceSize
+                                                                 1>; // InSrcOutDstVectorSize
+
+int main()
+{
+    std::vector<ck::index_t> window_lengths    = {5, 5, 5};
+    std::vector<ck::index_t> window_strides    = {2, 2, 2};
+    std::vector<ck::index_t> window_dilations  = {2, 2, 2};
+    std::vector<ck::index_t> dinput_left_pads  = {0, 0, 0};
+    std::vector<ck::index_t> dinput_right_pads = {0, 0, 0};
+
+    ck::index_t N  = 1;
+    ck::index_t C  = 16;
+    ck::index_t Di = 40;
+    ck::index_t Hi = 40;
+    ck::index_t Wi = 40;
+
+    pool3d_bwd_test<DevicePoolBwdInstance, DOutDataType, DInDataType, DOutLayout, DInLayout>(
+        true,
+        false,
+        N,
+        C,
+        Di,
+        Hi,
+        Wi,
+        window_lengths,
+        window_strides,
+        window_dilations,
+        dinput_left_pads,
+        dinput_right_pads);
+}

example/51_avgpool3d_bwd/avgpool3d_bwd_common.hpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2023, Advanced Micro Devices, Inc. All rights reserved.
+
+#include <iostream>
+
+#include "ck/ck.hpp"
+
+#include "ck/library/utility/check_err.hpp"
+#include "ck/library/utility/device_memory.hpp"
+#include "ck/library/utility/host_tensor.hpp"
+#include "ck/library/utility/host_tensor_generator.hpp"
+#include "ck/library/utility/literals.hpp"
+#include "ck/library/reference_tensor_operation/cpu/reference_avgpool_bwd.hpp"
+
+template <typename TensorLayout>
+std::vector<ck::index_t> f_tensor_strides_ncdhw(ck::index_t N_,
+                                                ck::index_t C_,
+                                                ck::index_t D,
+                                                ck::index_t H,
+                                                ck::index_t W,
+                                                TensorLayout layout)
+{
+    using namespace ck::literals;
+    (void)N_;
+    if constexpr(ck::is_same<decltype(layout), ck::tensor_layout::convolution::NCDHW>::value)
+        return {C_ * D * H * W, D * H * W, H * W, W, 1_uz};
+    else if constexpr(ck::is_same<decltype(layout), ck::tensor_layout::convolution::NDHWC>::value)
+        return {D * C_ * H * W, 1_uz, C_ * H * W, W * C_, C_};
+};
+
+template <typename TensorLayout>
+HostTensorDescriptor f_host_tensor_descriptor(std::size_t N_,
+                                              std::size_t C_,
+                                              std::size_t D,
+                                              std::size_t H,
+                                              std::size_t W,
+                                              TensorLayout layout)
+{
+    using namespace ck::literals;
+
+    if constexpr(ck::is_same<decltype(layout), ck::tensor_layout::convolution::NCDHW>::value)
+    {
+        return HostTensorDescriptor({N_, C_, D, H, W}, {C_ * D * H * W, D * H * W, H * W, W, 1_uz});
+    }
+    else if constexpr(ck::is_same<decltype(layout), ck::tensor_layout::convolution::NDHWC>::value)
+    {
+        return HostTensorDescriptor({N_, C_, D, H, W},
+                                    {D * C_ * H * W, 1_uz, C_ * H * W, W * C_, C_});
+    }
+};
+
+template <typename DevicePoolBwdInstance,
+          typename DOutDataType,
+          typename DInDataType,
+          typename DOutLayout,
+          typename DInLayout>
+bool pool3d_bwd_test(bool do_verification,
+                     bool time_kernel,
+                     ck::index_t N,
+                     ck::index_t C,
+                     ck::index_t Di,
+                     ck::index_t Hi,
+                     ck::index_t Wi,
+                     std::vector<ck::index_t> window_lengths,
+                     std::vector<ck::index_t> window_strides,
+                     std::vector<ck::index_t> window_dilations,
+                     std::vector<ck::index_t> dinput_left_pads,
+                     std::vector<ck::index_t> dinput_right_pads)
+{
+    auto OutSpatialLength = [&](auto InSpatialLength, int index) {
+        ck::index_t left_pad   = dinput_left_pads[index];
+        ck::index_t right_pad  = dinput_right_pads[index];
+        ck::index_t window_len = window_lengths[index];
+        ck::index_t stride     = window_strides[index];
+        ck::index_t dilation   = window_dilations[index];
+        ck::index_t eff        = (window_len - 1) * dilation + 1;
+        return (InSpatialLength + left_pad + right_pad - eff) / stride + 1;
+    };
+
+    ck::index_t Do = OutSpatialLength(Di, 0);
+    ck::index_t Ho = OutSpatialLength(Hi, 1);
+    ck::index_t Wo = OutSpatialLength(Wi, 2);
+
+    Tensor<DOutDataType> dout(f_host_tensor_descriptor(N, C, Do, Ho, Wo, DOutLayout{}));
+    Tensor<DInDataType> din_dev(f_host_tensor_descriptor(N, C, Di, Hi, Wi, DInLayout{}));
+    Tensor<DInDataType> din_host(f_host_tensor_descriptor(N, C, Di, Hi, Wi, DInLayout{}));
+
+    std::cout << "dout: " << dout.mDesc << std::endl;
+    std::cout << "din_host: " << din_host.mDesc << std::endl;
+
+    dout.GenerateTensorValue(GeneratorTensor_3<DOutDataType>{0.0, 1.0});
+
+    DeviceMem dout_device_buf(sizeof(DOutDataType) * dout.mDesc.GetElementSpaceSize());
+    DeviceMem din_device_buf(sizeof(DInDataType) * din_dev.mDesc.GetElementSpaceSize());
+
+    dout_device_buf.ToDevice(dout.mData.data());
+    din_device_buf.SetZero();
+
+    auto pool        = DevicePoolBwdInstance{};
+    auto invoker_ptr = pool.MakeInvokerPointer();
+    auto argument_ptr =
+        pool.MakeArgumentPointer(static_cast<DOutDataType*>(dout_device_buf.GetDeviceBuffer()),
+                                 static_cast<DInDataType*>(din_device_buf.GetDeviceBuffer()),
+                                 {N, C, Do, Ho, Wo},
+                                 {N, C, Di, Hi, Wi},
+                                 f_tensor_strides_ncdhw(N, C, Do, Ho, Wo, DOutLayout{}),
+                                 f_tensor_strides_ncdhw(N, C, Di, Hi, Wi, DInLayout{}),
+                                 window_lengths,
+                                 window_strides,
+                                 window_dilations,
+                                 dinput_left_pads,
+                                 dinput_right_pads);
+
+    if(!pool.IsSupportedArgument(argument_ptr.get()))
+    {
+        throw std::runtime_error("wrong! device_op with the specified compilation parameters does "
+                                 "not support this problem");
+    }
+
+    float ave_time = invoker_ptr->Run(argument_ptr.get(), StreamConfig{nullptr, time_kernel});
+    std::cout << "Perf: " << ave_time << std::endl;
+
+    bool pass = true;
+
+    if(do_verification)
+    {
+        auto ref_pool =
+            ck::tensor_operation::host::ReferenceAvgPoolBwd<3, DInDataType, DOutDataType>();
+
+        auto ref_invoker = ref_pool.MakeInvoker();
+
+        auto ref_argument = ref_pool.MakeArgument(din_host,
+                                                  dout,
+                                                  window_lengths,
+                                                  window_strides,
+                                                  window_dilations,
+                                                  dinput_left_pads,
+                                                  dinput_right_pads);
+
+        ref_invoker.Run(ref_argument);
+
+        din_device_buf.FromDevice(din_dev.mData.data());
+        pass = ck::utils::check_err(din_dev, din_host);
+    }
+
+    return pass;
+}

example/51_avgpool3d_bwd/avgpool3d_bwd_fp16.cpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2023, Advanced Micro Devices, Inc. All rights reserved.
+
+#include <iostream>
+
+#include "ck/ck.hpp"
+#include "ck/tensor_operation/gpu/device/tensor_layout.hpp"
+#include "ck/tensor_operation/gpu/device/impl/device_avgpool3d_bwd_ndhwc_ndhwc.hpp"
+
+#include "avgpool3d_bwd_common.hpp"
+
+using DOutDataType    = ck::half_t;
+using DInDataType     = ck::half_t;
+using ComputeDataType = float;
+
+#if 1
+using DOutLayout = ck::tensor_layout::convolution::NDHWC;
+using DInLayout  = ck::tensor_layout::convolution::NDHWC;
+#else
+using DOutLayout = ck::tensor_layout::convolution::NCDHW;
+using DInLayout  = ck::tensor_layout::convolution::NCDHW;
+#endif
+
+using DevicePoolBwdInstance =
+    ck::tensor_operation::device::DeviceAvgPool3dBwd_NDHWC_NDHWC<DOutDataType,
+                                                                 DInDataType,
+                                                                 ComputeDataType,
+                                                                 64, // BlockSize
+                                                                 64, // ReduceMThreadClusterSize
+                                                                 1,  // ReduceKThreadClusterSize
+                                                                 1,  // ReduceMThreadSliceSize
+                                                                 1,  // ReduceKThreadSliceSize
+                                                                 1>; // InSrcOutDstVectorSize
+
+int main()
+{
+    std::vector<ck::index_t> window_lengths    = {5, 5, 5};
+    std::vector<ck::index_t> window_strides    = {2, 2, 2};
+    std::vector<ck::index_t> window_dilations  = {2, 2, 2};
+    std::vector<ck::index_t> dinput_left_pads  = {0, 0, 0};
+    std::vector<ck::index_t> dinput_right_pads = {0, 0, 0};
+
+    ck::index_t N  = 1;
+    ck::index_t C  = 16;
+    ck::index_t Di = 40;
+    ck::index_t Hi = 40;
+    ck::index_t Wi = 40;
+
+    pool3d_bwd_test<DevicePoolBwdInstance, DOutDataType, DInDataType, DOutLayout, DInLayout>(
+        true,
+        false,
+        N,
+        C,
+        Di,
+        Hi,
+        Wi,
+        window_lengths,
+        window_strides,
+        window_dilations,
+        dinput_left_pads,
+        dinput_right_pads);
+}

example/51_avgpool3d_bwd/avgpool3d_bwd_fp32.cpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2023, Advanced Micro Devices, Inc. All rights reserved.
+
+#include <iostream>
+
+#include "ck/ck.hpp"
+#include "ck/tensor_operation/gpu/device/tensor_layout.hpp"
+#include "ck/tensor_operation/gpu/device/impl/device_avgpool3d_bwd_ndhwc_ndhwc.hpp"
+
+#include "avgpool3d_bwd_common.hpp"
+
+using DOutDataType    = float;
+using DInDataType     = float;
+using ComputeDataType = float;
+
+#if 1
+using DOutLayout = ck::tensor_layout::convolution::NDHWC;
+using DInLayout  = ck::tensor_layout::convolution::NDHWC;
+#else
+using DOutLayout = ck::tensor_layout::convolution::NCDHW;
+using DInLayout  = ck::tensor_layout::convolution::NCDHW;
+#endif
+
+using DevicePoolBwdInstance =
+    ck::tensor_operation::device::DeviceAvgPool3dBwd_NDHWC_NDHWC<DOutDataType,
+                                                                 DInDataType,
+                                                                 ComputeDataType,
+                                                                 64, // BlockSize
+                                                                 64, // ReduceMThreadClusterSize
+                                                                 1,  // ReduceKThreadClusterSize
+                                                                 1,  // ReduceMThreadSliceSize
+                                                                 1,  // ReduceKThreadSliceSize
+                                                                 1>; // InSrcOutDstVectorSize
+
+int main()
+{
+    std::vector<ck::index_t> window_lengths    = {5, 5, 5};
+    std::vector<ck::index_t> window_strides    = {2, 2, 2};
+    std::vector<ck::index_t> window_dilations  = {2, 2, 2};
+    std::vector<ck::index_t> dinput_left_pads  = {0, 0, 0};
+    std::vector<ck::index_t> dinput_right_pads = {0, 0, 0};
+
+    ck::index_t N  = 1;
+    ck::index_t C  = 16;
+    ck::index_t Di = 40;
+    ck::index_t Hi = 40;
+    ck::index_t Wi = 40;
+
+    pool3d_bwd_test<DevicePoolBwdInstance, DOutDataType, DInDataType, DOutLayout, DInLayout>(
+        true,
+        false,
+        N,
+        C,
+        Di,
+        Hi,
+        Wi,
+        window_lengths,
+        window_strides,
+        window_dilations,
+        dinput_left_pads,
+        dinput_right_pads);
+}

include/ck/tensor_operation/gpu/device/device_avgpool_bwd.hpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2023, Advanced Micro Devices, Inc. All rights reserved.
+
+#pragma once
+
+#include <vector>
+
+#include "ck/tensor_operation/gpu/device/device_base.hpp"
+
+namespace ck {
+namespace tensor_operation {
+namespace device {
+
+template <index_t NDimSpatial,
+          typename DOutDataType,
+          typename DInDataType,
+          typename DOutLayout,
+          typename DInLayout>
+struct DeviceAvgPoolBwd : public BaseOperator
+{
+    virtual std::unique_ptr<BaseArgument>
+    MakeArgumentPointer(const void* p_dout,
+                        void* p_din,
+                        std::vector<ck::index_t> dout_n_k_wos_lengths,
+                        std::vector<ck::index_t> dout_n_k_wos_strides,
+                        std::vector<ck::index_t> din_n_k_wos_length,
+                        std::vector<ck::index_t> din_n_k_wos_strides,
+                        std::vector<ck::index_t> window_k_c_xs_lengths,
+                        std::vector<ck::index_t> window_strides,
+                        std::vector<ck::index_t> window_dilations,
+                        std::vector<ck::index_t> input_left_pads,
+                        std::vector<ck::index_t> input_right_pads) = 0;
+
+    virtual std::unique_ptr<BaseInvoker> MakeInvokerPointer() = 0;
+};
+
+} // namespace device
+} // namespace tensor_operation
+} // namespace ck

include/ck/tensor_operation/gpu/device/device_put_element.hpp

 // SPDX-License-Identifier: MIT
-// Copyright (c) 2018-2022, Advanced Micro Devices, Inc. All rights reserved.
+// Copyright (c) 2018-2023, Advanced Micro Devices, Inc. All rights reserved.
 
 #pragma once
 

include/ck/tensor_operation/gpu/grid/gridwise_put_element_1d.hpp

 // SPDX-License-Identifier: MIT
-// Copyright (c) 2018-2022, Advanced Micro Devices, Inc. All rights reserved.
+// Copyright (c) 2018-2023, Advanced Micro Devices, Inc. All rights reserved.
 
 #pragma once
 

library/include/ck/library/reference_tensor_operation/cpu/reference_avgpool_bwd.hpp

+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2023, Advanced Micro Devices, Inc. All rights reserved.
+
+#pragma once
+
+#include <iostream>
+#include <sstream>
+
+#include "ck/tensor_operation/gpu/device/device_base.hpp"
+
+#include "ck/library/utility/host_tensor.hpp"
+
+namespace ck {
+namespace tensor_operation {
+namespace host {
+
+// dinput descriptor in [N, C, Do, Ho, Wo] order
+// doutput descriptor in [N, C, Di, Hi, Wi] order
+// phyiscal layout is irrelavent
+template <ck::index_t NDimSpatial,
+          typename DInDataType,
+          typename DOutDataType,
+          typename std::enable_if<NDimSpatial >= 1 && NDimSpatial <= 3, bool>::type = false>
+struct ReferenceAvgPoolBwd : public device::BaseOperator
+{
+    // Argument
+    struct Argument : public device::BaseArgument
+    {
+        Argument(Tensor<DInDataType>& dinput,
+                 const Tensor<DOutDataType>& doutput,
+                 std::vector<ck::index_t> window_spatial_lengths,
+                 std::vector<ck::index_t> window_strides,
+                 std::vector<ck::index_t> window_dilations,
+                 std::vector<ck::index_t> dinput_left_pads,
+                 std::vector<ck::index_t> dinput_right_pads)
+            : dinput_{dinput},
+              doutput_{doutput},
+              window_spatial_lengths_{window_spatial_lengths},
+              window_strides_{window_strides},
+              window_dilations_{window_dilations},
+              in_left_pads_{dinput_left_pads},
+              in_right_pads_{dinput_right_pads}
+        {
+        }
+
+        Tensor<DInDataType>& dinput_;
+        const Tensor<DOutDataType>& doutput_;
+
+        std::vector<ck::index_t> window_spatial_lengths_;
+        std::vector<index_t> window_strides_;
+        std::vector<index_t> window_dilations_;
+        std::vector<index_t> in_left_pads_;
+        std::vector<index_t> in_right_pads_;
+    };
+
+    // Invoker
+    struct Invoker : public device::BaseInvoker
+    {
+        using Argument = ReferenceAvgPoolBwd::Argument;
+
+        template <ck::index_t NDimSpatial_,
+                  typename std::enable_if<NDimSpatial_ == 1, bool>::type = false>
+        float RunAvgPoolBwd(const Argument& arg)
+        {
+            // Let input = x, outpu = y
+            // shape of x = [10], y = [6]
+            // window_size = 5, pad = 0, stride = 1, dilation = 1
+            // Forward:
+            // y0 = 1/5 * (x0 + x1 + x2 + x3 + x4)
+            // y1 = 1/5 * (x1 + x2 + x3 + x4 + x5)
+            // ...
+            // y5 = 1/5 * (x5 + x6 + x7 + x8 + x9)
+            // y6 = 1/5 * (x6 + x7 + x8 + x9)
+            // ...
+            // y9 = 1/5 * (x9)
+
+            // Backward:
+            // shape of dy = [6], dx = [10]
+            // dx0 = 1/5 * dy0
+            // dx1 = 1/5 * (dy0 + dy1)
+            // dx2 = 1/5 * (dy0 + dy1 + dy2)
+            // ...
+            // dx4 = 1/5 * (dy0 + dy1 + dy2 + dy3 + dy4)
+            // dx5 = 1/5 * (dy1 + dy2 + dy3 + dy4 + dy5)
+            // ...
+            // dx9 = 1/5 * (dy5 + dy6 + dy7 + dy8 + dy9)
+
+            auto f_ncw = [&](auto n, auto c, auto wi) {
+                std::size_t X  = arg.window_spatial_lengths_[0];
+                std::size_t Wo = arg.doutput_.GetLengths()[2];
+
+                float v_acc = 0;
+
+                for(std::size_t x = 0; x < X; ++x)
+                {
+                    // Out_Position = (In_Position + pad - x * dilation) / stride
+                    auto w_tmp = static_cast<ck::long_index_t>(wi) +
+                                 static_cast<ck::long_index_t>(arg.in_left_pads_[0]) -
+                                 static_cast<ck::long_index_t>(x * arg.window_dilations_[0]);
+
+                    // Check the input pixel validity (in perspective of being affected by some
+                    // doutput pixel)
+                    if(w_tmp % arg.window_strides_[0] == 0)
+                    {
+                        auto wo = static_cast<ck::long_index_t>(w_tmp) /
+                                  static_cast<ck::long_index_t>(arg.window_strides_[0]);
+
+                        // Get the doutput pixel in valid range to accumulate the gradients for this
+                        // input pixel
+                        if(wo >= 0 && ck::type_convert<std::size_t>(wo) < Wo)
+                        {
+                            v_acc += ck::type_convert<float>(arg.doutput_(n, c, wo));
+                        }
+                    }
+                }
+
+                v_acc /= ck::type_convert<float>(X);
+                arg.dinput_(n, c, wi) = ck::type_convert<DInDataType>(v_acc);
+            };
+
+            make_ParallelTensorFunctor(f_ncw,
+                                       arg.dinput_.GetLengths()[0],
+                                       arg.dinput_.GetLengths()[1],
+                                       arg.dinput_.GetLengths()[2])(
+                std::thread::hardware_concurrency());
+
+            return 0;
+        }
+
+        template <ck::index_t NDimSpatial_,
+                  typename std::enable_if<NDimSpatial_ == 2, bool>::type = false>
+        float RunAvgPoolBwd(const Argument& arg)
+        {
+            auto f_nchw = [&](auto n, auto c, auto hi, auto wi) {
+                std::size_t Y = arg.window_spatial_lengths_[0];
+                std::size_t X = arg.window_spatial_lengths_[1];
+
+                std::size_t Ho = arg.doutput_.GetLengths()[2];
+                std::size_t Wo = arg.doutput_.GetLengths()[3];
+
+                float v_acc = 0;
+
+                for(std::size_t y = 0; y < Y; ++y)
+                {
+                    // Out_Position = (In_Position + pad - x * dilation) / stride
+                    auto h_tmp = static_cast<ck::long_index_t>(hi) +
+                                 static_cast<ck::long_index_t>(arg.in_left_pads_[0]) -
+                                 static_cast<ck::long_index_t>(y * arg.window_dilations_[0]);
+
+                    // Check the input pixel validity (in perspective of being affected by some
+                    // doutput pixel)
+                    if(h_tmp % arg.window_strides_[0] == 0)
+                    {
+                        auto ho = static_cast<ck::long_index_t>(h_tmp) /
+                                  static_cast<ck::long_index_t>(arg.window_strides_[0]);
+
+                        // Get the doutput pixel in valid range to accumulate the gradients for this
+                        // input pixel
+                        if(ho >= 0 && ck::type_convert<std::size_t>(ho) < Ho)
+                        {
+                            for(std::size_t x = 0; x < X; ++x)
+                            {
+                                auto w_tmp =
+                                    static_cast<ck::long_index_t>(wi) +
+                                    static_cast<ck::long_index_t>(arg.in_left_pads_[1]) -
+                                    static_cast<ck::long_index_t>(x * arg.window_dilations_[1]);
+                                if(w_tmp % arg.window_strides_[1] == 0)
+                                {
+                                    auto wo = static_cast<ck::long_index_t>(w_tmp) /
+                                              static_cast<ck::long_index_t>(arg.window_strides_[1]);
+                                    if(wo >= 0 && ck::type_convert<std::size_t>(wo) < Wo)
+                                    {
+                                        v_acc +=
+                                            ck::type_convert<float>(arg.doutput_(n, c, ho, wo));
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+
+                v_acc /= ck::type_convert<float>(Y * X);
+                arg.dinput_(n, c, hi, wi) = ck::type_convert<DInDataType>(v_acc);
+            };
+
+            make_ParallelTensorFunctor(f_nchw,
+                                       arg.dinput_.GetLengths()[0],
+                                       arg.dinput_.GetLengths()[1],
+                                       arg.dinput_.GetLengths()[2],
+                                       arg.dinput_.GetLengths()[3])(
+                std::thread::hardware_concurrency());
+
+            return 0;
+        }
+
+        template <ck::index_t NDimSpatial_,
+                  typename std::enable_if<NDimSpatial_ == 3, bool>::type = false>
+        float RunAvgPoolBwd(const Argument& arg)
+        {
+            auto f_ncdhw = [&](auto n, auto c, auto di, auto hi, auto wi) {
+                std::size_t Z = arg.window_spatial_lengths_[0];
+                std::size_t Y = arg.window_spatial_lengths_[1];
+                std::size_t X = arg.window_spatial_lengths_[2];
+
+                std::size_t Do = arg.doutput_.GetLengths()[2];
+                std::size_t Ho = arg.doutput_.GetLengths()[3];
+                std::size_t Wo = arg.doutput_.GetLengths()[4];
+
+                float v_acc = 0;
+
+                for(std::size_t z = 0; z < Z; ++z)
+                {
+                    // Out_Position = (In_Position + pad - x * dilation) / stride
+                    auto d_tmp = static_cast<ck::long_index_t>(di) +
+                                 static_cast<ck::long_index_t>(arg.in_left_pads_[0]) -
+                                 static_cast<ck::long_index_t>(z * arg.window_dilations_[0]);
+
+                    // Check the input pixel validity (in perspective of being affected by some
+                    // doutput pixel)
+                    if(d_tmp % arg.window_strides_[0] == 0)
+                    {
+                        auto do_ = static_cast<ck::long_index_t>(d_tmp) /
+                                   static_cast<ck::long_index_t>(arg.window_strides_[0]);
+
+                        // Get the doutput pixel in valid range to accumulate the gradients for this
+                        // input pixel
+                        if(do_ >= 0 && ck::type_convert<std::size_t>(do_) < Do)
+                        {
+                            for(std::size_t y = 0; y < Y; ++y)
+                            {
+                                auto h_tmp =
+                                    static_cast<ck::long_index_t>(hi) +
+                                    static_cast<ck::long_index_t>(arg.in_left_pads_[1]) -
+                                    static_cast<ck::long_index_t>(y * arg.window_dilations_[1]);
+                                if(h_tmp % arg.window_strides_[1] == 0)
+                                {
+                                    auto ho = static_cast<ck::long_index_t>(h_tmp) /
+                                              static_cast<ck::long_index_t>(arg.window_strides_[1]);
+                                    if(ho >= 0 && ck::type_convert<std::size_t>(ho) < Ho)
+                                    {
+                                        for(std::size_t x = 0; x < X; ++x)
+                                        {
+                                            auto w_tmp = static_cast<ck::long_index_t>(wi) +
+                                                         static_cast<ck::long_index_t>(
+                                                             arg.in_left_pads_[2]) -
+                                                         static_cast<ck::long_index_t>(
+                                                             x * arg.window_dilations_[2]);
+
+                                            if(w_tmp % arg.window_strides_[2] == 0)
+                                            {
+                                                auto wo = static_cast<ck::long_index_t>(w_tmp) /
+                                                          static_cast<ck::long_index_t>(
+                                                              arg.window_strides_[2]);
+                                                if(wo >= 0 &&
+                                                   ck::type_convert<std::size_t>(wo) < Wo)
+                                                {
+                                                    v_acc += ck::type_convert<float>(
+                                                        arg.doutput_(n, c, do_, ho, wo));
+                                                }
+                                            }
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+
+                v_acc /= ck::type_convert<float>(Z * Y * X);
+                arg.dinput_(n, c, di, hi, wi) = ck::type_convert<DInDataType>(v_acc);
+            };
+
+            make_ParallelTensorFunctor(f_ncdhw,
+                                       arg.dinput_.GetLengths()[0],
+                                       arg.dinput_.GetLengths()[1],
+                                       arg.dinput_.GetLengths()[2],
+                                       arg.dinput_.GetLengths()[3],
+                                       arg.dinput_.GetLengths()[4])(
+                std::thread::hardware_concurrency());
+
+            return 0;
+        }
+
+        float Run(const Argument& arg)
+        {
+            if(!(arg.dinput_.GetNumOfDimension() == NDimSpatial + 2 &&
+                 arg.doutput_.GetNumOfDimension() == NDimSpatial + 2))
+            {
+                throw std::runtime_error("wrong! inconsistent dimension");
+            }
+
+            return RunAvgPoolBwd<NDimSpatial>(arg);
+        }
+
+        float Run(const device::BaseArgument* p_arg,
+                  const StreamConfig& /* stream_config */ = StreamConfig{}) override
+        {
+            return Run(*dynamic_cast<const Argument*>(p_arg));
+        }
+    };
+
+    static constexpr bool IsValidCompilationParameter()
+    {
+        // TODO: properly implement this check
+        return true;
+    }
+
+    bool IsSupportedArgument(const device::BaseArgument*) override { return true; }
+
+    static auto MakeArgument(Tensor<DInDataType>& dinput,
+                             const Tensor<DOutDataType>& doutput,
+                             std::vector<ck::index_t> window_spatial_lengths,
+                             std::vector<ck::index_t> window_strides,
+                             std::vector<ck::index_t> window_dilations,
+                             std::vector<ck::index_t> dinput_left_pads,
+                             std::vector<ck::index_t> dinput_right_pads)
+    {
+        if(window_spatial_lengths.size() != NDimSpatial || window_strides.size() != NDimSpatial ||
+           window_dilations.size() != NDimSpatial || dinput_left_pads.size() != NDimSpatial ||
+           dinput_right_pads.size() != NDimSpatial)
+            throw std::runtime_error("dimension is incorrect");
+
+        return Argument{dinput,
+                        doutput,
+                        window_spatial_lengths,
+                        window_strides,
+                        window_dilations,
+                        dinput_left_pads,
+                        dinput_right_pads};
+    }
+
+    static auto MakeInvoker() { return Invoker{}; }
+
+    virtual std::unique_ptr<device::BaseInvoker> MakeInvokerPointer()
+    {
+        return std::make_unique<Invoker>(Invoker{});
+    }
+
+    std::string GetTypeString() const override
+    {
+        auto str = std::stringstream();
+
+        // clang-format off
+        str << "ReferenceAvgPoolBwd"
+            << std::endl;
+        // clang-format on
+
+        return str.str();
+    }
+};
+
+} // namespace host
+} // namespace tensor_operation
+} // namespace ck

library/include/ck/library/reference_tensor_operation/cpu/reference_conv_bwd_data.hpp

@@ -125,7 +125,7 @@ struct ReferenceConvBwdData : public device::BaseOperator
 
                     arg.in_element_op_(v_in, v_acc);
 
-                    arg.input_(g, n, c, wi) = ck::type_convert<InDataType>(v_acc);
+                    arg.input_(g, n, c, wi) = ck::type_convert<InDataType>(v_in);
                 };
 
                 make_ParallelTensorFunctor(f_ncw,
@@ -201,7 +201,7 @@ struct ReferenceConvBwdData : public device::BaseOperator
 
                     arg.in_element_op_(v_in, v_acc);
 
-                    arg.input_(g, n, c, hi, wi) = ck::type_convert<InDataType>(v_acc);
+                    arg.input_(g, n, c, hi, wi) = ck::type_convert<InDataType>(v_in);
                 };
 
                 make_ParallelTensorFunctor(f_nchw,
@@ -299,7 +299,7 @@ struct ReferenceConvBwdData : public device::BaseOperator
 
                     arg.in_element_op_(v_in, v_acc);
 
-                    arg.input_(g, n, c, di, hi, wi) = ck::type_convert<InDataType>(v_acc);
+                    arg.input_(g, n, c, di, hi, wi) = ck::type_convert<InDataType>(v_in);
                 };
 
                 make_ParallelTensorFunctor(f_ncdhw,