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+/*
+ * Copyright (c) 2019 Samsung Electronics Co., Ltd. All Rights Reserved
+ * Copyright (c) 2017-2019 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.
+ */
+#ifndef __ARM_COMPUTE_NETRANSPOSECONVLAYER_H__
+#define __ARM_COMPUTE_NETRANSPOSECONVLAYER_H__
+
+#include "arm_compute/runtime/CPP/functions/CPPUpsampleEx.h"
+#include "arm_compute/runtime/NEON/functions/NEConvolutionLayer.h"
+#include "arm_compute/runtime/NEON/functions/NEDirectConvolutionLayer.h"
+#include "arm_compute/runtime/NEON/functions/NEPermute.h"
+
+#include "arm_compute/core/CPP/kernels/CPPFlipWeightsKernel.h"
+#include "arm_compute/core/Types.h"
+#include "arm_compute/runtime/IFunction.h"
+#include "arm_compute/runtime/IMemoryManager.h"
+#include "arm_compute/runtime/MemoryGroup.h"
+#include "arm_compute/runtime/Tensor.h"
+
+#include <memory>
+
+namespace arm_compute
+{
+/** Function to run the deconvolution layer.
+ *
+ * Transpose convolution Layer is the backward pass of Convolution Layer. First we transform the
+ * input depending on the stride and pad info and then perfrom a 1x1
+ * convolution pass. Input stride defines how many zeroes we should put between each element of the
+ * input, pad is the amount of padding and finaly a is a user
+ * specified value where a < stride - 1 that increases the padding top and right of the input image.
+ *
+ * The relation between input to output is as follows:
+ * \f[
+ * width\_output = (width\_input - 1) \cdot stride\_x - 2 \cdot padding\_x + kernel\_x
+ * \f]
+ * \f[
+ * height\_output = (height\_input - 1) \cdot stride\_y - 2 \cdot padding\_y + kernel\_y
+ * \f]
+ *
+ * where
+ * width is the size of the first input dimension.
+ * height is the size of the second input dimension.
+ * width_output is the size of the first output dimension.
+ * height_output is the size of the second output dimension.
+ * kernel_x and kernel_y are the convolution sizes in x and y.
+ * stride_x and stride_y is the input stride of the first and second dimension.
+ *
+ * The weights used by Transpose convolution are supposed to be the same as the ones used for
+ * Convolution. Therefore, it will be necessary to use the weights in the
+ * reverse order to perform an actual convolution. This is achieved by using the @ref
+ * CPPFlipWeightsKernel.
+ *
+ * This function calls the following NEON kernels/functions:
+ *
+ * -# @ref CPPUpsample
+ * -# @ref NEConvolutionLayer
+ *
+ */
+class NETransposeConvLayer : public IFunction
+{
+public:
+ /** Default constructor */
+ NETransposeConvLayer(std::shared_ptr<IMemoryManager> memory_manager = nullptr);
+
+ /** Prevent instances of this class from being copied (As this class contains pointers) */
+ NETransposeConvLayer(const NETransposeConvLayer &) = delete;
+ /** Prevent instances of this class from being copied (As this class contains pointers) */
+ NETransposeConvLayer &operator=(const NETransposeConvLayer &) = delete;
+ /** Allow instances of this class to be moved */
+ NETransposeConvLayer(NETransposeConvLayer &&) = default;
+ /** Allow instances of this class to be moved */
+ NETransposeConvLayer &operator=(NETransposeConvLayer &&) = default;
+ /** Default destructor */
+ virtual ~NETransposeConvLayer() = default;
+
+ /** Set the input, weights, biases and output tensors.
+ *
+ * @param[in,out] input Input tensor. 3 lower dimensions represent a single input, and an
+ * optional 4th dimension for batch of inputs. Data types supported: F32/F16/QASYMM8.
+ * @param[in] weights The 4d weights with dimensions [width, height, IFM, OFM]. Data type
+ * supported: Same as @p input.
+ * @param[in] bias Optional, ignored if NULL. The biases have one dimension. Data type
+ * supported: Data types supported: S32 for QASYMM8 input, F32 for F32 input, F16 for F16 input.
+ * @param[out] output Output tensor. The output has the same number of dimensions as the @p
+ * input.
+ * @param[in] info Contains padding and policies to be used in the deconvolution, this is
+ * decribed in @ref PadStrideInfo.
+ * @param[in] invalid_right The number of zeros added to right edge of the output.
+ * @param[in] invalid_bottom The number of zeros added to top edge of the output.
+ *
+ */
+ void configure(ITensor *input, const ITensor *weights, const ITensor *bias, ITensor *output,
+ const PadStrideInfo &info, unsigned int invalid_right,
+ unsigned int invalid_bottom);
+ /** Static function to check if given info will lead to a valid configuration of @ref
+ * NETransposeConvLayer
+ *
+ * @param[in] input Input tensor info. 3 lower dimensions represent a single input, and an
+ * optional 4th dimension for batch of inputs. Data types supported: F32/F16/QASYMM8.
+ * @param[in] weights The 4d weights info with dimensions [width, height, IFM, OFM]. Data type
+ * supported: Same as @p input.
+ * @param[in] bias (Optional) The biases have one dimension. Data type supported: Data types
+ * supported: S32 for QASYMM8 input, F32 for F32 input, F16 for F16 input.
+ * @param[in] output Output tensor info. The output has the same number of dimensions as the @p
+ * input.
+ * @param[in] info Contains padding and policies to be used in the deconvolution, this is
+ * decribed in @ref PadStrideInfo.
+ * @param[in] innvalid_right The number of zeros added to right edge of the output.
+ * @param[in] invalid_bottom The number of zeros added to top edge of the output.
+ *
+ * @return a status
+ */
+ static Status validate(const ITensorInfo *input, const ITensorInfo *weights,
+ const ITensorInfo *bias, const ITensorInfo *output,
+ const PadStrideInfo &info, unsigned int invalid_right,
+ unsigned int invalid_bottom);
+
+ // Inherited methods overridden:
+ void run() override;
+ void prepare() override;
+
+private:
+ MemoryGroup _memory_group;
+ NEConvolutionLayer _conv_f;
+ CPPUpsampleEx _upsample_f;
+ CPPFlipWeightsKernel _flip_weights;
+ NEPermute _permute_input;
+ NEPermute _permute_weights;
+ NEPermute _permute_output;
+ Tensor _scaled_output;
+ Tensor _weights_flipped;
+ Tensor _permuted_input;
+ Tensor _permuted_weights;
+ Tensor _permuted_output;
+ bool _is_nchw;
+ const ITensor *_original_weights;
+ ITensor *_input;
+ PadStrideInfo _info;
+ bool _is_prepared;
+};
+} // arm_compute
+#endif /* __ARM_COMPUTE_NETRANSPOSECONVLAYER_H__ */