haojin2 commented on a change in pull request #11587: [MXNET-378] Adding
depth_to_space and space_to_depth operator(Updated)
URL: https://github.com/apache/incubator-mxnet/pull/11587#discussion_r204856166
##########
File path: src/operator/tensor/matrix_op-inl.h
##########
@@ -2171,6 +2171,328 @@ inline bool SqueezeShape(const nnvm::NodeAttrs& attrs,
return true;
}
+struct DepthToSpaceParam : public dmlc::Parameter<DepthToSpaceParam> {
+ int block_size;
+ DMLC_DECLARE_PARAMETER(DepthToSpaceParam) {
+ DMLC_DECLARE_FIELD(block_size)
+ .describe("Blocks of [block_size. block_size] are moved");
+ }
+};
+
+inline bool DepthToSpaceOpShape(const nnvm::NodeAttrs& attrs,
+ std::vector<TShape>* in_attrs,
+ std::vector<TShape>* out_attrs) {
+ const DepthToSpaceParam& param = nnvm::get<DepthToSpaceParam>(attrs.parsed);
+ CHECK_EQ(in_attrs->size(), 1U);
+ CHECK_EQ(out_attrs->size(), 1U);
+ CHECK_EQ(in_attrs->at(0).ndim(), 4) << "Operation Depth To Space requires
exactly 4D tensor";
+
+ TShape expected_out(4);
+
+ TShape& in_shape = in_attrs->at(0);
+ int block = param.block_size;
+ CHECK_NE(block, 0) << "block_size must be a positive integer value";
+ CHECK_NE(in_shape[1], 0) << "Depth dimension:1 cannot be 0";
+ CHECK_EQ(in_shape[1] % (block * block), 0)
+ << "Cannot perform Depth To Space operation on the specified tensor."
+ " Dimension:1(depth dimension) should be a multiple of 'block^2'";
+ CHECK_NE(in_shape[0], 0)
+ << "Operation requires a 4D tensor. Size of dimension:0 cannot be 0";
+ CHECK_NE(in_shape[2], 0)
+ << "Operation requires a 4D tensor. Size of dimension:2 cannot be 0";
+ CHECK_NE(in_shape[3], 0)
+ << "Operation requires a 4D tensor. Size of dimension:3 cannot be 0";
+
+ expected_out[0] = in_shape[0];
+ expected_out[1] = in_shape[1] / (block * block);
+ uint32_t i = 2;
+ while (i < expected_out.ndim()) {
+ expected_out[i] = in_shape[i] * block;
+ ++i;
+ }
+
+ SHAPE_ASSIGN_CHECK(*out_attrs, 0, expected_out);
+ return true;
+}
+
+inline bool DepthToSpaceOpType(const nnvm::NodeAttrs& attrs,
+ std::vector<int>* in_attrs,
+ std::vector<int>* out_attrs) {
+ CHECK_EQ(in_attrs->size(), 1U);
+ CHECK_EQ(out_attrs->size(), 1U);
+
+ TYPE_ASSIGN_CHECK(*out_attrs, 0, in_attrs->at(0));
+ TYPE_ASSIGN_CHECK(*in_attrs, 0, out_attrs->at(0));
+ return out_attrs->at(0) != -1;
+}
+
+/*!
+ * \brief This function updates the value of input index from where the data
element
+ * needs to be fetched and written out to the ith location in output tensor
+ * \param index_position index within offset array to get offset of given
dimension
+ * \param dim_size size of current dimension
+ * \param idx output tensor index
+ * \param inp_index index within input tensor from where value is
retrieved
+ * \param offset_arr array containing the linear offset of input tensor
+ */
+MSHADOW_XINLINE void update_index(int index_position, int dim_size, int *idx,
+ int *inp_index, const int* offset_arr) {
+ int next_idx_val = *idx / dim_size;
+ *inp_index += (*idx - next_idx_val * dim_size) * offset_arr[index_position];
+ *idx = next_idx_val;
+}
+
+/*!
+ * \brief This function preforms the tensor transpose (0, 1, 2, 3, 4, 5) ->
+ * (0, 3, 4, 1, 5, 2) by computing linear index within input tensor to be
mapped
+ * to the ith index of output tensor
+ * \param i tensor index
+ * \param out_data output tensor
+ * \param in_data input tensor
+ * \param block size of chunks to be moved out of depth dimension
+ * \param size array containing the size of each dimension of input
tensor
+ * \param offset_arr array containing the linear offset of input tensor
+ */
+template<int req>
+struct depth_to_space_forward {
+ template<typename DType>
+ MSHADOW_XINLINE static void Map(int i, DType* out_data, const DType* in_data,
+ const int block, const int* size, const int*
offset_arr) {
+ int inp_index = 0, idx = i, dim_size;
+ dim_size = block;
+ update_index(2, dim_size, &idx, &inp_index, offset_arr);
+ dim_size = size[3];
+ update_index(5, dim_size, &idx, &inp_index, offset_arr);
+ dim_size = block;
+ update_index(1, dim_size, &idx, &inp_index, offset_arr);
+ dim_size = size[2];
+ update_index(4, dim_size, &idx, &inp_index, offset_arr);
+ dim_size = size[1] / (block * block);
+ update_index(3, dim_size, &idx, &inp_index, offset_arr);
+ dim_size = size[0];
+ update_index(0, dim_size, &idx, &inp_index, offset_arr);
+ KERNEL_ASSIGN(out_data[i], req, in_data[inp_index]);
+ }
+};
+
+/*!
+ * \brief This function calculates the linear offset for each dimension of
+ * input tensor and stores them in an array, which is later used in
+ * performing depth_to_space operation
+ * \param i global thread id
+ * \param offset_arr array to be populated with offset values
+ * \param size array to be populated with size of each dimension of
input tensor
+ * \param block size of chunks to be moved out of depth dimension
+ * \param size0 size of Dim 0 of input tensor
+ * \param size1 size of Dim 1 of input tensor
+ * \param size2 size of Dim 2 of input tensor
+ * \param size3 size of Dim 3 of input tensor
+ */
+template<int req>
+struct compute_offset_for_depth_to_space {
+ template<typename DType>
+ MSHADOW_XINLINE static void Map(int i, DType* offset_arr, DType* size, const
int block,
+ const int32_t size0, const int32_t size1,
const int32_t size2,
+ const int32_t size3) {
+ size[0] = size0;
+ size[1] = size1;
+ size[2] = size2;
+ size[3] = size3;
+
+ offset_arr[5] = 1;
+ offset_arr[4] = offset_arr[5] * size[3];
+ offset_arr[3] = offset_arr[4] * size[2];
+ offset_arr[2] = offset_arr[3] * size[1] / (block * block);
+ offset_arr[1] = offset_arr[2] * block;
+ offset_arr[0] = offset_arr[1] * block;
+ }
+};
+
+template<typename xpu>
+void DepthToSpaceOpForward(const nnvm::NodeAttrs& attrs,
+ const OpContext& ctx,
+ const std::vector<TBlob>& inputs,
+ const std::vector<OpReqType>& req,
+ const std::vector<TBlob>& outputs) {
+ CHECK_EQ(inputs.size(), 1U);
+ CHECK_EQ(outputs.size(), 1U);
+ CHECK_EQ(req.size(), 1U);
+ mshadow::Stream<xpu> *s = ctx.get_stream<xpu>();
+ const TBlob& in_data = inputs[0];
+ const TBlob& out_data = outputs[0];
+ const DepthToSpaceParam& param = nnvm::get<DepthToSpaceParam>(attrs.parsed);
+ using namespace mxnet_op;
+ int block = param.block_size;
+
+ mshadow::Tensor<xpu, 1, char> workspace =
+ ctx.requested[0].get_space_typed<xpu, 1,
char>(mshadow::Shape1(sizeof(int32_t) * 10), s);
+ char* workspace_curr_ptr = workspace.dptr_;
+ int32_t* offset_arr = reinterpret_cast<int32_t*>(workspace_curr_ptr);
+ int32_t* size = reinterpret_cast<int32_t*>(workspace_curr_ptr +
sizeof(int32_t) * 6);
+
+ MSHADOW_TYPE_SWITCH(out_data.type_flag_, DType, {
+ MXNET_ASSIGN_REQ_SWITCH(req[0], req_type, {
+ Kernel<compute_offset_for_depth_to_space<req_type>, xpu>::Launch(
+ s, 1, offset_arr, size, block, in_data.shape_[0], in_data.shape_[1],
+ in_data.shape_[2], in_data.shape_[3]);
+
+ Kernel<depth_to_space_forward<req_type>, xpu>::Launch(
+ s, out_data.Size(), out_data.dptr<DType>(), in_data.dptr<DType>(),
+ block, size, offset_arr);
+ });
+ });
+}
+
+inline bool SpaceToDepthOpShape(const nnvm::NodeAttrs& attrs,
+ std::vector<TShape>* in_attrs,
+ std::vector<TShape>* out_attrs) {
+ const DepthToSpaceParam& param = nnvm::get<DepthToSpaceParam>(attrs.parsed);
+ CHECK_EQ(in_attrs->size(), 1U);
+ CHECK_EQ(out_attrs->size(), 1U);
+ CHECK_EQ(in_attrs->at(0).ndim(), 4) << "Operation Space To Depth requires
exactly 4D tensor";
+
+ TShape expected_out(in_attrs->at(0).ndim());
+
+ TShape& in_shape = in_attrs->at(0);
+ int block = param.block_size;
+ CHECK_NE(block, 0) << "block_size must be a positive integer value";
+ CHECK_NE(in_shape[0], 0)
+ << "Operation requires a 4D tensor. Size of dimension:0 cannot be 0";
+ CHECK_NE(in_shape[1], 0) << "Depth dimension:1 cannot be 0";
+ CHECK_NE(in_shape[2], 0)
+ << "Operation requires a 4D tensor. Size of dimension:2 cannot be 0";
+ CHECK_EQ(in_shape[2]%block, 0)
+ << "Cannot perform Depth To Space operation on the specified tensor."
+ " Dimension:2(1st Space dimension) should be a multiple of 'block' ";
+ CHECK_NE(in_shape[3], 0)
+ << "Operation requires a 4D tensor. Size of dimension:3 cannot be 0";
+ CHECK_EQ(in_shape[3]%block, 0)
Review comment:
nit: add spaces around `%`
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