!3344 GPU Pad Op

Merge pull request !3344 from danishnxt/PR-GPU-Pad

mindspore/ccsrc/backend/kernel_compiler/gpu/nn/pad_gpu_kernel.cc

+/**
+ * Copyright 2020 Huawei Technologies Co., Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://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.
+ */
+
+#include "backend/kernel_compiler/gpu/nn/pad_gpu_kernel.h"
+
+namespace mindspore {
+namespace kernel {
+MS_REG_GPU_KERNEL_ONE(Pad, KernelAttr().AddInputAttr(kNumberTypeFloat32).AddOutputAttr(kNumberTypeFloat32),
+                      PadGpuFwdKernel, float)
+MS_REG_GPU_KERNEL_ONE(Pad, KernelAttr().AddInputAttr(kNumberTypeFloat16).AddOutputAttr(kNumberTypeFloat16),
+                      PadGpuFwdKernel, half)
+}  // namespace kernel
+}  // namespace mindspore

mindspore/ccsrc/backend/kernel_compiler/gpu/nn/pad_gpu_kernel.h

+/**
+ * Copyright 2020 Huawei Technologies Co., Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://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.
+ */
+
+#ifndef MINDSPORE_CCSRC_BACKEND_KERNEL_COMPILER_GPU_NN_PAD_GPU_FWD_KERNEL_H_
+#define MINDSPORE_CCSRC_BACKEND_KERNEL_COMPILER_GPU_NN_PAD_GPU_FWD_KERNEL_H_
+
+#include <iostream>
+#include <vector>
+#include "backend/kernel_compiler/gpu/gpu_kernel.h"
+#include "backend/kernel_compiler/gpu/gpu_kernel_factory.h"
+#include "backend/kernel_compiler/gpu/cuda_impl/pad_impl.cuh"
+
+namespace mindspore {
+namespace kernel {
+template <typename T>
+class PadGpuFwdKernel : public GpuKernel {
+ public:
+  PadGpuFwdKernel() : shape_size_(0), temp(0), input_size_(0), output_size_(0), workspace_size_(0) {}
+  ~PadGpuFwdKernel() override = default;
+
+  const std::vector<size_t> &GetInputSizeList() const override { return input_size_list_; }
+  const std::vector<size_t> &GetOutputSizeList() const override { return output_size_list_; }
+  const std::vector<size_t> &GetWorkspaceSizeList() const override { return workspace_size_list_; }
+
+  bool Launch(const std::vector<AddressPtr> &inputs, const std::vector<AddressPtr> &workspace,
+              const std::vector<AddressPtr> &outputs, void *stream_ptr) override {
+    T *input = GetDeviceAddress<T>(inputs, 0);
+    T *output = GetDeviceAddress<T>(outputs, 0);
+    size_t size = output_size_ / sizeof(T);
+    int pad_left = paddings[3][0];
+    int pad_top = paddings[2][0];
+    T pad_value = 0.0;
+    CalPad(size, input, input_shape_[0], input_shape_[1], input_shape_[2], input_shape_[3], output_shape_[2],
+           output_shape_[3], pad_top, pad_left, pad_value, output, reinterpret_cast<cudaStream_t>(stream_ptr));
+    return true;
+  }
+
+  bool Init(const CNodePtr &kernel_node) override {
+    // check number of inputs -> should be 1
+    size_t input_num = AnfAlgo::GetInputTensorNum(kernel_node);
+    if (input_num != 1) {
+      MS_LOG(ERROR) << "Input number is " << input_num << ", but Pad needs 1 input.";
+      return false;
+    }
+    // check number of output -> should be 1
+    size_t output_num = AnfAlgo::GetOutputTensorNum(kernel_node);
+    if (output_num != 1) {
+      MS_LOG(ERROR) << "Output number is " << output_num << ", but Pad needs 1 output.";
+      return false;
+    }
+    auto input_shape = AnfAlgo::GetPrevNodeOutputInferShape(kernel_node, 0);
+    shape_size_ = input_shape.size();
+    // shape adjustement -> from 2d/3d to 4d to standardize
+    if (shape_size_ == 4) {
+    } else if (shape_size_ == 3) {
+      auto it = input_shape.begin();
+      input_shape.insert(it, 1);  // batch padding
+      shape_size_ = 4;
+    } else if (shape_size_ == 2) {
+      auto it = input_shape.begin();
+      input_shape.insert(it, 2, 1);  // channel padding
+      shape_size_ = 4;
+    }
+    paddings = GetValue<std::vector<std::vector<int>>>(AnfAlgo::GetCNodePrimitive(kernel_node)->GetAttr("paddings"));
+    // shape adjustement -> from 2d/3d to 4d to standardize
+    if (paddings.size() == 4) {
+    } else if (paddings.size() == 3) {
+      auto it = paddings.begin();
+      paddings.insert(it, 1, {0, 0});  // batch padding
+    } else if (paddings.size() == 2) {
+      auto it = paddings.begin();
+      paddings.insert(it, 2, {0, 0});  // channel padding
+    }
+    input_size_ = 1;
+    for (size_t i = 0; i < shape_size_; i++) {
+      input_size_ *= input_shape[i];
+      input_shape_.push_back(input_shape[i]);
+    }
+    input_size_ *= sizeof(T);
+    output_size_ = 1;
+    for (size_t i = 0; i < shape_size_; i++) {
+      temp = input_shape[i] + (paddings[i][0] + paddings[i][1]);  // compute new dim size
+      output_size_ *= temp;
+      output_shape_.push_back(temp);  // correct new dimension size
+    }
+    output_size_ *= sizeof(T);
+    InitSizeLists();
+    return true;
+  }
+
+ protected:
+  void InitSizeLists() override {
+    input_size_list_.push_back(input_size_);
+    output_size_list_.push_back(output_size_);
+  }
+
+ private:
+  size_t shape_size_;
+  size_t temp;
+  std::vector<std::vector<int>> paddings;  // list of paddings (tuple of tuple in python)
+  std::vector<int> input_shape_;           // dims of the input data
+  std::vector<int> output_shape_;          // dims of the output data
+  // default
+  size_t input_size_;
+  size_t output_size_;
+  size_t workspace_size_;
+  std::vector<size_t> input_size_list_;
+  std::vector<size_t> output_size_list_;
+  std::vector<size_t> workspace_size_list_;
+};
+}  // namespace kernel
+}  // namespace mindspore
+#endif  // MINDSPORE_CCSRC_BACKEND_KERNEL_COMPILER_GPU_NN_PAD_GPU_FWD_KERNEL_H_