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+/*
+ * Copyright (c) 2017 ARM Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#pragma once
+#include "arm_compute/core/NEON/kernels/convolution/winograd/winograd_gemm.hpp"
+
+namespace winograd
+{
+ template <int output_tile_rows, int output_tile_cols,
+ int kernel_rows, int kernel_cols>
+ template <typename T>
+ void WinogradGEMM<output_tile_rows, output_tile_cols, kernel_rows, kernel_cols>::OutputTransform<T>::execute(
+ const Tensor4DShape &output_shape,
+ const T* const matrix_base,
+ const int matrix_stride,
+ const int matrix_row_stride,
+ const T* const biases,
+ T* const output
+ )
+ {
+ // Compute the number of tiles and hence the padding required on the bottom
+ // and right of the image.
+ const int tile_M = iceildiv(output_shape.n_rows, output_tile_rows);
+ const int tile_N = iceildiv(output_shape.n_cols, output_tile_cols);
+ const int pad_bottom = output_tile_rows*tile_M - output_shape.n_rows;
+ const int pad_right = output_tile_cols*tile_N - output_shape.n_cols;
+
+ const int matrix_tile_row_stride = tile_N * matrix_row_stride;
+ const int matrix_batch_stride = tile_M * matrix_tile_row_stride;
+ const int output_col_stride = output_shape.n_channels;
+ const int output_row_stride = output_shape.n_cols * output_col_stride;
+ const int output_batch_stride = output_shape.n_rows * output_row_stride;
+
+ // Perform the output transformation for each batch
+ for (int batch = 0; batch < output_shape.n_batches; batch++)
+ {
+ // Get batch offset for input and outputs.
+ const T* const matrix_batch = matrix_base + batch*matrix_batch_stride;
+ T* const outptr_batch = output + batch*output_batch_stride;
+
+ // Perform the output transformation for each row of the output tensor.
+ for (int tile_i = 0; tile_i < tile_M; tile_i++)
+ {
+ // Compute properties of this row of output tiles
+ const int row_pad_bottom = (tile_i < tile_M - 1) ? 0: pad_bottom;
+ const T* const matrix_tile_row = matrix_batch + tile_i * matrix_tile_row_stride;
+ T* const outptr_row = outptr_batch + output_tile_rows*tile_i*output_row_stride;
+
+ // Process the row
+ process_tile_row(
+ tile_N, output_shape.n_channels, matrix_tile_row, matrix_stride,
+ matrix_row_stride, biases,
+ outptr_row, output_row_stride, output_col_stride, row_pad_bottom,
+ pad_right
+ );
+ }
+ }
+ }
+
+ template <int output_tile_rows, int output_tile_cols,
+ int kernel_rows, int kernel_cols>
+ template <typename T>
+ void WinogradGEMM<output_tile_rows, output_tile_cols, kernel_rows, kernel_cols>::OutputTransform<T>::process_tile_row(
+ const int tile_N,
+ const int n_channels,
+ const T* const matrix_base,
+ const int matrix_stride,
+ const int matrix_row_stride,
+ const T* const biases,
+ T* const output,
+ const int output_row_stride,
+ const int output_col_stride,
+ const int row_pad_bottom,
+ const int row_pad_right
+ )
+ {
+ // Loop over columns of tiles
+ for (int tile_j = 0; tile_j < tile_N; tile_j++)
+ {
+ // Properties of this tile
+ const int tile_pad_right = (tile_j < tile_N - 1) ? 0 : row_pad_right;
+ const T* const matrix_row = matrix_base + tile_j * matrix_row_stride;
+ T* const outptr = output + output_tile_cols*tile_j*output_col_stride;
+
+ // Perform the output transformation
+ tile_fns[row_pad_bottom][tile_pad_right](
+ n_channels, matrix_row, matrix_stride, biases,
+ outptr, output_row_stride, output_col_stride
+ );
+ }
+ }
+
+ template <int output_tile_rows, int output_tile_cols, int kr, int kc>
+ template <typename T>
+ size_t WinogradGEMM<output_tile_rows, output_tile_cols, kr, kc>::OutputTransform<T>::bytes_read(const Tensor4DShape &shape)
+ {
+ const int M = iceildiv(shape.n_rows, output_tile_rows) *
+ iceildiv(shape.n_cols, output_tile_cols);
+ const int N = shape.n_channels;
+ return inner_tile_rows * inner_tile_cols * M * N * sizeof(T);
+ }
+
+ template <int otr, int otc, int kr, int kc>
+ template <typename T>
+ size_t WinogradGEMM<otr, otc, kr, kc>::OutputTransform<T>::bytes_written(const Tensor4DShape &shape)
+ {
+ return shape.size() * sizeof(T);
+ }
+
+ template <int output_tile_rows, int output_tile_cols, int kr, int kc>
+ template <typename T>
+ WinogradGEMM<output_tile_rows, output_tile_cols, kr, kc>::OutputTransform<T>::OutputTransform(
+ const T* const matrix_base,
+ const int matrix_stride,
+ const int matrix_row_stride,
+ const T* const biases,
+ T* const output,
+ const int n_batches,
+ const int n_rows,
+ const int n_cols,
+ const int n_channels
+ ) : _matrix_base(matrix_base), _biases(biases),
+ _matrix_stride(matrix_stride), _matrix_row_stride(matrix_row_stride),
+ _outptr(output), _n_batches(n_batches), _n_rows(n_rows), _n_cols(n_cols),
+ _n_channels(n_channels), _tile_M(iceildiv(n_rows, output_tile_rows)),
+ _tile_N(iceildiv(n_cols, output_tile_cols))
+ {
+ }
+
+ template <int otr, int otc, int kr, int kc>
+ template <typename T>
+ unsigned int WinogradGEMM<otr, otc, kr, kc>::OutputTransform<T>::get_window() const
+ {
+ // TODO When the output transform supports multithreading, return the total
+ // number of tile rows (allowing for multiple batches). For now we return 1
+ // to indicate that the activations must be transformed as a single block.
+ return 1; // TODO _tile_M * _n_batches;
+ }
+
+ template <int otr, int otc, int kr, int kc>
+ template <typename T>
+ void WinogradGEMM<otr, otc, kr, kc>::OutputTransform<T>::run(
+ const unsigned int start, const unsigned int stop
+ )
+ {
+ // TODO When the output transform supports multithreading call execute for a
+ // portion of the tile rows.
+ (void) start;
+ (void) stop;
+
+ // For now, just do all of the work.
+ const Tensor4DShape output_shape = {
+ _n_batches, _n_rows, _n_cols, _n_channels, NHWC
+ };
+ execute(
+ output_shape, _matrix_base, _matrix_stride, _matrix_row_stride, _biases,
+ _outptr
+ );
+ }
+} // namespace winograd