src/runtime/CL/functions/CLFullyConnectedLayer.cpp - platform/external/ComputeLibrary - Git at Google

 /*
  * 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.
  */
 #include "arm_compute/runtime/CL/functions/CLFullyConnectedLayer.h"

 #include "arm_compute/core/Size2D.h"
 #include "arm_compute/core/Validate.h"
 #include "arm_compute/core/utils/misc/ShapeCalculator.h"
 #include "arm_compute/core/utils/quantization/AsymmHelpers.h"
 #include "arm_compute/runtime/CL/CLScheduler.h"
 #include "support/ToolchainSupport.h"

 #include <algorithm>

 using namespace arm_compute;
 using namespace arm_compute::misc::shape_calculator;

 namespace
 {
 Status validate_mm(const ITensorInfo &input, const ITensorInfo &weights, const ITensorInfo &output)
 {
     if(is_data_type_quantized_asymmetric(input.data_type()))
     {
         const UniformQuantizationInfo iq_info = input.quantization_info().uniform();
         const UniformQuantizationInfo wq_info = weights.quantization_info().uniform();

         // Since we need negative offsets for computing convolution, we need to change QuantizationInfo()
         // Extract and negate input and weights offset
         const QuantizationInfo input_quantization_info(iq_info.scale, -iq_info.offset);
         const QuantizationInfo weights_quantization_info(wq_info.scale, -wq_info.offset);

         // Validate gemmlowp function
         ARM_COMPUTE_RETURN_ON_ERROR(CLGEMMLowpMatrixMultiplyCore::validate(&input.clone()->set_quantization_info(input_quantization_info),
                                                                            &weights.clone()->set_quantization_info(weights_quantization_info),
                                                                            nullptr,
                                                                            &output));
     }
     else
     {
         ARM_COMPUTE_RETURN_ON_ERROR(CLGEMM::validate(&input, &weights, nullptr, &output, 1.f, 0.0f, GEMMInfo(false, false, true /* Reshape weights only for the first run */)));
     }

     return Status{};
 }
 } // namespace

 void CLFullyConnectedLayerReshapeWeights::configure(const ICLTensor *input, ICLTensor *output)
 {
     auto k = arm_compute::support::cpp14::make_unique<CLTransposeKernel>();
     k->configure(input, output);
     _kernel = std::move(k);
 }

 Status CLFullyConnectedLayerReshapeWeights::validate(const ITensorInfo *input, const ITensorInfo *output)
 {
     return CLTransposeKernel::validate(input, output);
 }

 CLFullyConnectedLayer::CLFullyConnectedLayer(std::shared_ptr<IMemoryManager> memory_manager)
     : _memory_group(memory_manager), _convert_weights(), _flatten_layer(), _reshape_weights_kernel(), _mm_gemm(memory_manager), _mm_gemmlowp(memory_manager), _gemmlowp_output_stage(),
       _accumulate_biases_kernel(), _flatten_output(), _gemmlowp_output(), _converted_weights_output(), _reshape_weights_output(), _are_weights_converted(true), _are_weights_reshaped(true),
       _is_fc_after_conv(true), _accumulate_biases(false), _is_quantized(false), _is_prepared(false), _original_weights(nullptr)
 {
 }
 void CLFullyConnectedLayer::configure_mm(const ICLTensor *input, const ICLTensor *weights, ICLTensor *output, bool retain_internal_weights)
 {
     if(_is_quantized)
     {
         // Since we need negative offsets for computing convolution, we need to change QuantizationInfo()
         // Extract and negate input and weights offset
         const QuantizationInfo input_quantization_info   = input->info()->quantization_info();
         const QuantizationInfo weights_quantization_info = weights->info()->quantization_info();

         input->info()->set_quantization_info(QuantizationInfo(input_quantization_info.uniform().scale, -input_quantization_info.uniform().offset));
         weights->info()->set_quantization_info(QuantizationInfo(weights_quantization_info.uniform().scale, -weights_quantization_info.uniform().offset));

         // Configure gemmlowp function
         _mm_gemmlowp.configure(input, weights, nullptr, output);

         // Revert back QuantizatioInfo as input and weights could be used in other fully connected layers
         input->info()->set_quantization_info(input_quantization_info);
         weights->info()->set_quantization_info(weights_quantization_info);
     }
     else
     {
         // Configure matrix multiply kernel
         _mm_gemm.configure(input, weights, nullptr, output, 1.f, 0.0f, GEMMInfo(false, false, true /* Reshape weights only for the first run */, 0, false, retain_internal_weights));
     }
 }

 void CLFullyConnectedLayer::configure_conv_fc(const ICLTensor *input, const ICLTensor *weights, ICLTensor *output, bool retain_internal_weights)
 {
     ARM_COMPUTE_ERROR_ON((weights->info()->dimension(1) != (input->info()->dimension(0) * input->info()->dimension(1) * input->info()->dimension(2))));

     // If the fully connected layer is called after a convolution layer, the input tensor must be linearized

     // Initialize output tensor for flatten
     TensorShape shape_flatten = compute_flatten_shape(input->info());
     _flatten_output.allocator()->init(input->info()->clone()->set_is_resizable(true).reset_padding().set_tensor_shape(shape_flatten).set_data_layout(DataLayout::NCHW));

     // Configure flatten kernel
     _memory_group.manage(&_flatten_output);
     _flatten_layer.configure(input, &_flatten_output);

     // Configure matrix multiply kernel
     configure_mm(&_flatten_output, weights, output, retain_internal_weights);

     // Allocate the output tensor for flatten once all the configure methods have been called
     _flatten_output.allocator()->allocate();
 }

 void CLFullyConnectedLayer::configure_fc_fc(const ICLTensor *input, const ICLTensor *weights, ICLTensor *output, bool retain_internal_weights)
 {
     ARM_COMPUTE_ERROR_ON(input->info()->dimension(0) != weights->info()->dimension(1));

     // Configure matrix multiply kernel
     configure_mm(input, weights, output, retain_internal_weights);
 }

 void CLFullyConnectedLayer::configure(const ICLTensor *input, const ICLTensor *weights, const ICLTensor *biases, ICLTensor *output,
                                       FullyConnectedLayerInfo fc_info)
 {
     ARM_COMPUTE_ERROR_ON_NULLPTR(input, weights, output);

     // Perform validate step
     ARM_COMPUTE_ERROR_THROW_ON(CLFullyConnectedLayer::validate(input->info(),
                                                                weights->info(),
                                                                biases != nullptr ? biases->info() : nullptr,
                                                                output->info(),
                                                                fc_info));

     _are_weights_converted = true;
     _are_weights_reshaped  = fc_info.transpose_weights ? fc_info.are_weights_reshaped : true;
     _is_fc_after_conv      = true;
     _accumulate_biases     = false;
     _is_quantized          = is_data_type_quantized_asymmetric(input->info()->data_type());
     _is_prepared           = fc_info.retain_internal_weights;
     _original_weights      = weights;

     // Configure gemmlowp output
     if(_is_quantized)
     {
         _gemmlowp_output.allocator()->init(output->info()->clone()->set_is_resizable(true).reset_padding().set_data_type(DataType::S32));
     }

     // Configure accumulate biases kernel for non quantized asymmetric types
     if(biases != nullptr && !_is_quantized)
     {
         ARM_COMPUTE_ERROR_ON_MISMATCHING_DATA_TYPES(input, biases);

         _accumulate_biases = true;

         // Configure accumulate biases kernel
         _accumulate_biases_kernel.set_target(CLScheduler::get().target());
         _accumulate_biases_kernel.configure(output, biases);
     }

     const ICLTensor *weights_to_use = weights;

     // With the Fully Connected layer we can have 4 different cases:
     //  1) Convolution layer -> Fully Connected layer without batches
     //  2) Fully Connected layer -> Fully Connected layer without batches
     //  3) Convolution layer -> Fully Connected layer with batches
     //  4) Fully Connected layer -> Fully Connected layer with batches

     // Check if we have a fully connected layer with batches
     const bool is_batched_fc_layer = output->info()->dimension(1) > 1;
     if(is_batched_fc_layer)
     {
         _is_fc_after_conv = (TensorShape::num_max_dimensions >= 4) && (std::equal(input->info()->tensor_shape().cbegin() + 3,
                                                                                   input->info()->tensor_shape().cend(),
                                                                                   output->info()->tensor_shape().cbegin() + 1));
     }
     else
     {
         _is_fc_after_conv = input->info()->num_dimensions() > 1;
     }

     // Reshape weights if needed
     if(!_are_weights_reshaped)
     {
         // Reshape the weights
         _reshape_weights_kernel.configure(weights, &_reshape_weights_output);
         weights_to_use = &_reshape_weights_output;
     }

     // Convert weights if needed
     if(_is_fc_after_conv && (input->info()->data_layout() != fc_info.weights_trained_layout))
     {
         // Convert weights
         _convert_weights.configure(weights_to_use,
                                    &_converted_weights_output,
                                    input->info()->tensor_shape(),
                                    fc_info.weights_trained_layout);

         weights_to_use         = &_converted_weights_output;
         _are_weights_converted = false;
     }

     // Configure fc core
     ICLTensor *tmp_output = (_is_quantized) ? &_gemmlowp_output : output;
     if(_is_fc_after_conv)
     {
         // Fully Connected layer after a Convolution Layer without batches
         configure_conv_fc(input, weights_to_use, tmp_output, fc_info.retain_internal_weights);
     }
     else
     {
         // Fully Connected layer after a Fully Connected Layer without batches
         configure_fc_fc(input, weights_to_use, tmp_output, fc_info.retain_internal_weights);
     }

     // Configure output stage for asymmetric quantized types
     if(_is_quantized)
     {
         const UniformQuantizationInfo iq_info = input->info()->quantization_info().uniform();
         const UniformQuantizationInfo wq_info = weights->info()->quantization_info().uniform();
         const UniformQuantizationInfo oq_info = output->info()->quantization_info().uniform();

         float multiplier = iq_info.scale * wq_info.scale / oq_info.scale;
         int   output_multiplier;
         int   output_shift;
         quantization::calculate_quantized_multiplier_less_than_one(multiplier, &output_multiplier, &output_shift);
         _gemmlowp_output_stage.configure(&_gemmlowp_output, biases, output, output_multiplier, output_shift, oq_info.offset);
         _gemmlowp_output.allocator()->allocate();
     }
 }

 Status CLFullyConnectedLayer::validate(const ITensorInfo *input, const ITensorInfo *weights, const ITensorInfo *biases, const ITensorInfo *output,
                                        FullyConnectedLayerInfo fc_info)
 {
     ARM_COMPUTE_RETURN_ERROR_ON_NULLPTR(input, weights, output);
     ARM_COMPUTE_RETURN_ERROR_ON_DATA_TYPE_CHANNEL_NOT_IN(input, 1, DataType::QASYMM8, DataType::F16, DataType::F32);
     ARM_COMPUTE_RETURN_ERROR_ON_MISMATCHING_DATA_TYPES(input, weights, output);
     ARM_COMPUTE_RETURN_ERROR_ON(weights->num_dimensions() > 2);

     bool            weights_reshaped = fc_info.transpose_weights ? fc_info.are_weights_reshaped : true;
     bool            is_fc_after_conv = true;
     bool            is_quantized     = is_data_type_quantized_asymmetric(input->data_type());
     const GPUTarget gpu_target       = CLScheduler::get().target();

     const ITensorInfo &flatten_input     = TensorInfo(input->clone()->set_is_resizable(true).reset_padding().set_tensor_shape(compute_flatten_shape(input)).set_data_layout(DataLayout::NCHW));
     const ITensorInfo &reshaped_weights  = TensorInfo(weights->clone()->set_is_resizable(true).reset_padding().set_tensor_shape(compute_transposed_shape(*weights)));
     const ITensorInfo &converted_weights = weights_reshaped ? TensorInfo(weights->clone()->set_is_resizable(true).reset_padding()) : TensorInfo(*reshaped_weights.clone());
     const ITensorInfo &gemmlowp_output   = TensorInfo(output->clone()->set_is_resizable(true).reset_padding().set_data_type(DataType::S32));

     // Configure accumulate biases kernel for non quantized asymmetric types
     if(biases != nullptr && !is_quantized)
     {
         ARM_COMPUTE_RETURN_ERROR_ON_MISMATCHING_DATA_TYPES(input, biases);
         ARM_COMPUTE_RETURN_ON_ERROR(CLGEMMMatrixAccumulateBiasesKernel::validate(output, biases, gpu_target));
     }

     // With the Fully Connected layer we can have 4 different cases:
     //  1) Convolution layer -> Fully Connected layer without batches
     //  2) Fully Connected layer -> Fully Connected layer without batches
     //  3) Convolution layer -> Fully Connected layer with batches
     //  4) Fully Connected layer -> Fully Connected layer with batches

     const ITensorInfo *input_to_use   = input;
     const ITensorInfo *weights_to_use = weights;
     const ITensorInfo *tmp_output     = (is_quantized) ? &gemmlowp_output : output;

     // Check if we have a fully connected layer with batches
     const bool is_batched_fc_layer = output->dimension(1) > 1;
     if(is_batched_fc_layer)
     {
         is_fc_after_conv = (TensorShape::num_max_dimensions >= 4) && (std::equal(input->tensor_shape().cbegin() + 3,
                                                                                  input->tensor_shape().cend(),
                                                                                  output->tensor_shape().cbegin() + 1));
     }
     else
     {
         is_fc_after_conv = input->num_dimensions() > 1;
     }

     if(!weights_reshaped)
     {
         // Validate reshape weights kernel
         ARM_COMPUTE_RETURN_ON_ERROR(CLFullyConnectedLayerReshapeWeights::validate(weights, &reshaped_weights));
         weights_to_use = &reshaped_weights;
     }

     if(is_fc_after_conv && (input->data_layout() != fc_info.weights_trained_layout))
     {
         // Validate convert weights kernel
         ARM_COMPUTE_RETURN_ON_ERROR(CLConvertFullyConnectedWeights::validate(weights_to_use,
                                                                              &converted_weights,
                                                                              input->tensor_shape(),
                                                                              fc_info.weights_trained_layout));
         weights_to_use = &converted_weights;
     }

     if(is_fc_after_conv)
     {
         // Fully Connected layer after a Convolution Layer without batches
         ARM_COMPUTE_RETURN_ERROR_ON((weights_to_use->dimension(1) != (input->dimension(0) * input->dimension(1) * input->dimension(2))));

         // Validate flatten kernel
         ARM_COMPUTE_RETURN_ON_ERROR(CLFlattenLayer::validate(input, &flatten_input));
         input_to_use = &flatten_input;
     }
     else
     {
         // Fully Connected layer after a Fully Connected Layer without batches
         ARM_COMPUTE_RETURN_ERROR_ON(input->dimension(0) != weights_to_use->dimension(1));
     }
     // Validate matrix multiply kernel
     ARM_COMPUTE_RETURN_ON_ERROR(validate_mm(*input_to_use, *weights_to_use, *tmp_output));

     // Validate output stage for asymmetric quantized types
     if(is_quantized)
     {
         const UniformQuantizationInfo iq_info    = input->quantization_info().uniform();
         const UniformQuantizationInfo wq_info    = weights->quantization_info().uniform();
         const UniformQuantizationInfo oq_info    = output->quantization_info().uniform();
         const float                   multiplier = iq_info.scale * wq_info.scale / oq_info.scale;

         ARM_COMPUTE_UNUSED(multiplier);
         ARM_COMPUTE_RETURN_ERROR_ON(multiplier > 1.0f);
         ARM_COMPUTE_RETURN_ON_ERROR(CLGEMMLowpQuantizeDownInt32ToUint8ScaleByFixedPoint::validate(&gemmlowp_output, biases, output));
     }

     return Status{};
 }

 void CLFullyConnectedLayer::run()
 {
     prepare();

     MemoryGroupResourceScope scope_mg(_memory_group);

     // Linearize input if it comes from a convolutional layer
     if(_is_fc_after_conv)
     {
         _flatten_layer.run();
     }

     // Run matrix multiply
     if(_is_quantized)
     {
         _mm_gemmlowp.run();
     }
     else
     {
         _mm_gemm.run();
     }

     // Accumulate biases if provided
     if(_is_quantized)
     {
         _gemmlowp_output_stage.run();
     }
     else
     {
         if(_accumulate_biases)
         {
             CLScheduler::get().enqueue(_accumulate_biases_kernel);
         }
     }
 }

 void CLFullyConnectedLayer::prepare()
 {
     if(!_is_prepared)
     {
         ARM_COMPUTE_ERROR_ON(!_original_weights->is_used());

         auto release_unused = [](CLTensor * w)
         {
             if(!w->is_used())
             {
                 CLScheduler::get().queue().finish();
                 w->allocator()->free();
             }
         };

         // Pointer to current weights
         const ICLTensor *cur_weights = _original_weights;

         // Reshape of the weights if needed (happens only once)
         if(!_are_weights_reshaped)
         {
             // Run reshape weights kernel and mark weights as unused
             _reshape_weights_output.allocator()->allocate();
             _reshape_weights_kernel.run();

             cur_weights->mark_as_unused();
             cur_weights           = &_reshape_weights_output;
             _are_weights_reshaped = true;
         }

         // Convert weights if needed (happens only once)
         if(!_are_weights_converted)
         {
             _converted_weights_output.allocator()->allocate();
             _convert_weights.run();

             cur_weights->mark_as_unused();
             _are_weights_converted = true;
         }

         // Release reshaped weights if unused
         release_unused(&_reshape_weights_output);

         // Prepare GEMM prepare and release unused weights
         if(!_is_quantized)
         {
             _mm_gemm.prepare();
         }

         // Release converted weights if unused
         release_unused(&_reshape_weights_output);
         release_unused(&_converted_weights_output);

         _is_prepared = true;
     }
 }
	/*
	* 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.
	*/
	#include "arm_compute/runtime/CL/functions/CLFullyConnectedLayer.h"

	#include "arm_compute/core/Size2D.h"
	#include "arm_compute/core/Validate.h"
	#include "arm_compute/core/utils/misc/ShapeCalculator.h"
	#include "arm_compute/core/utils/quantization/AsymmHelpers.h"
	#include "arm_compute/runtime/CL/CLScheduler.h"
	#include "support/ToolchainSupport.h"

	#include <algorithm>

	using namespace arm_compute;
	using namespace arm_compute::misc::shape_calculator;

	namespace
	{
	Status validate_mm(const ITensorInfo &input, const ITensorInfo &weights, const ITensorInfo &output)
	{
	if(is_data_type_quantized_asymmetric(input.data_type()))
	{
	const UniformQuantizationInfo iq_info = input.quantization_info().uniform();
	const UniformQuantizationInfo wq_info = weights.quantization_info().uniform();

	// Since we need negative offsets for computing convolution, we need to change QuantizationInfo()
	// Extract and negate input and weights offset
	const QuantizationInfo input_quantization_info(iq_info.scale, -iq_info.offset);
	const QuantizationInfo weights_quantization_info(wq_info.scale, -wq_info.offset);

	// Validate gemmlowp function
	ARM_COMPUTE_RETURN_ON_ERROR(CLGEMMLowpMatrixMultiplyCore::validate(&input.clone()->set_quantization_info(input_quantization_info),
	&weights.clone()->set_quantization_info(weights_quantization_info),
	nullptr,
	&output));
	}
	else
	{
	ARM_COMPUTE_RETURN_ON_ERROR(CLGEMM::validate(&input, &weights, nullptr, &output, 1.f, 0.0f, GEMMInfo(false, false, true /* Reshape weights only for the first run */)));
	}

	return Status{};
	}
	} // namespace

	void CLFullyConnectedLayerReshapeWeights::configure(const ICLTensor input, ICLTensor output)
	{
	auto k = arm_compute::support::cpp14::make_unique<CLTransposeKernel>();
	k->configure(input, output);
	_kernel = std::move(k);
	}

	Status CLFullyConnectedLayerReshapeWeights::validate(const ITensorInfo input, const ITensorInfo output)
	{
	return CLTransposeKernel::validate(input, output);
	}

	CLFullyConnectedLayer::CLFullyConnectedLayer(std::shared_ptr<IMemoryManager> memory_manager)
	: _memory_group(memory_manager), _convert_weights(), _flatten_layer(), _reshape_weights_kernel(), _mm_gemm(memory_manager), _mm_gemmlowp(memory_manager), _gemmlowp_output_stage(),
	_accumulate_biases_kernel(), _flatten_output(), _gemmlowp_output(), _converted_weights_output(), _reshape_weights_output(), _are_weights_converted(true), _are_weights_reshaped(true),
	_is_fc_after_conv(true), _accumulate_biases(false), _is_quantized(false), _is_prepared(false), _original_weights(nullptr)
	{
	}
	void CLFullyConnectedLayer::configure_mm(const ICLTensor input, const ICLTensor weights, ICLTensor *output, bool retain_internal_weights)
	{
	if(_is_quantized)
	{
	// Since we need negative offsets for computing convolution, we need to change QuantizationInfo()
	// Extract and negate input and weights offset
	const QuantizationInfo input_quantization_info = input->info()->quantization_info();
	const QuantizationInfo weights_quantization_info = weights->info()->quantization_info();

	input->info()->set_quantization_info(QuantizationInfo(input_quantization_info.uniform().scale, -input_quantization_info.uniform().offset));
	weights->info()->set_quantization_info(QuantizationInfo(weights_quantization_info.uniform().scale, -weights_quantization_info.uniform().offset));

	// Configure gemmlowp function
	_mm_gemmlowp.configure(input, weights, nullptr, output);

	// Revert back QuantizatioInfo as input and weights could be used in other fully connected layers
	input->info()->set_quantization_info(input_quantization_info);
	weights->info()->set_quantization_info(weights_quantization_info);
	}
	else
	{
	// Configure matrix multiply kernel
	_mm_gemm.configure(input, weights, nullptr, output, 1.f, 0.0f, GEMMInfo(false, false, true /* Reshape weights only for the first run */, 0, false, retain_internal_weights));
	}
	}

	void CLFullyConnectedLayer::configure_conv_fc(const ICLTensor input, const ICLTensor weights, ICLTensor *output, bool retain_internal_weights)
	{
	ARM_COMPUTE_ERROR_ON((weights->info()->dimension(1) != (input->info()->dimension(0) * input->info()->dimension(1) * input->info()->dimension(2))));

	// If the fully connected layer is called after a convolution layer, the input tensor must be linearized

	// Initialize output tensor for flatten
	TensorShape shape_flatten = compute_flatten_shape(input->info());
	_flatten_output.allocator()->init(input->info()->clone()->set_is_resizable(true).reset_padding().set_tensor_shape(shape_flatten).set_data_layout(DataLayout::NCHW));

	// Configure flatten kernel
	_memory_group.manage(&_flatten_output);
	_flatten_layer.configure(input, &_flatten_output);

	// Configure matrix multiply kernel
	configure_mm(&_flatten_output, weights, output, retain_internal_weights);

	// Allocate the output tensor for flatten once all the configure methods have been called
	_flatten_output.allocator()->allocate();
	}

	void CLFullyConnectedLayer::configure_fc_fc(const ICLTensor input, const ICLTensor weights, ICLTensor *output, bool retain_internal_weights)
	{
	ARM_COMPUTE_ERROR_ON(input->info()->dimension(0) != weights->info()->dimension(1));

	// Configure matrix multiply kernel
	configure_mm(input, weights, output, retain_internal_weights);
	}

	void CLFullyConnectedLayer::configure(const ICLTensor input, const ICLTensor weights, const ICLTensor biases, ICLTensor output,
	FullyConnectedLayerInfo fc_info)
	{
	ARM_COMPUTE_ERROR_ON_NULLPTR(input, weights, output);

	// Perform validate step
	ARM_COMPUTE_ERROR_THROW_ON(CLFullyConnectedLayer::validate(input->info(),
	weights->info(),
	biases != nullptr ? biases->info() : nullptr,
	output->info(),
	fc_info));

	_are_weights_converted = true;
	_are_weights_reshaped = fc_info.transpose_weights ? fc_info.are_weights_reshaped : true;
	_is_fc_after_conv = true;
	_accumulate_biases = false;
	_is_quantized = is_data_type_quantized_asymmetric(input->info()->data_type());
	_is_prepared = fc_info.retain_internal_weights;
	_original_weights = weights;

	// Configure gemmlowp output
	if(_is_quantized)
	{
	_gemmlowp_output.allocator()->init(output->info()->clone()->set_is_resizable(true).reset_padding().set_data_type(DataType::S32));
	}

	// Configure accumulate biases kernel for non quantized asymmetric types
	if(biases != nullptr && !_is_quantized)
	{
	ARM_COMPUTE_ERROR_ON_MISMATCHING_DATA_TYPES(input, biases);

	_accumulate_biases = true;

	// Configure accumulate biases kernel
	_accumulate_biases_kernel.set_target(CLScheduler::get().target());
	_accumulate_biases_kernel.configure(output, biases);
	}

	const ICLTensor *weights_to_use = weights;

	// With the Fully Connected layer we can have 4 different cases:
	// 1) Convolution layer -> Fully Connected layer without batches
	// 2) Fully Connected layer -> Fully Connected layer without batches
	// 3) Convolution layer -> Fully Connected layer with batches
	// 4) Fully Connected layer -> Fully Connected layer with batches

	// Check if we have a fully connected layer with batches
	const bool is_batched_fc_layer = output->info()->dimension(1) > 1;
	if(is_batched_fc_layer)
	{
	_is_fc_after_conv = (TensorShape::num_max_dimensions >= 4) && (std::equal(input->info()->tensor_shape().cbegin() + 3,
	input->info()->tensor_shape().cend(),
	output->info()->tensor_shape().cbegin() + 1));
	}
	else
	{
	_is_fc_after_conv = input->info()->num_dimensions() > 1;
	}

	// Reshape weights if needed
	if(!_are_weights_reshaped)
	{
	// Reshape the weights
	_reshape_weights_kernel.configure(weights, &_reshape_weights_output);
	weights_to_use = &_reshape_weights_output;
	}

	// Convert weights if needed
	if(_is_fc_after_conv && (input->info()->data_layout() != fc_info.weights_trained_layout))
	{
	// Convert weights
	_convert_weights.configure(weights_to_use,
	&_converted_weights_output,
	input->info()->tensor_shape(),
	fc_info.weights_trained_layout);

	weights_to_use = &_converted_weights_output;
	_are_weights_converted = false;
	}

	// Configure fc core
	ICLTensor *tmp_output = (_is_quantized) ? &_gemmlowp_output : output;
	if(_is_fc_after_conv)
	{
	// Fully Connected layer after a Convolution Layer without batches
	configure_conv_fc(input, weights_to_use, tmp_output, fc_info.retain_internal_weights);
	}
	else
	{
	// Fully Connected layer after a Fully Connected Layer without batches
	configure_fc_fc(input, weights_to_use, tmp_output, fc_info.retain_internal_weights);
	}

	// Configure output stage for asymmetric quantized types
	if(_is_quantized)
	{
	const UniformQuantizationInfo iq_info = input->info()->quantization_info().uniform();
	const UniformQuantizationInfo wq_info = weights->info()->quantization_info().uniform();
	const UniformQuantizationInfo oq_info = output->info()->quantization_info().uniform();

	float multiplier = iq_info.scale * wq_info.scale / oq_info.scale;
	int output_multiplier;
	int output_shift;
	quantization::calculate_quantized_multiplier_less_than_one(multiplier, &output_multiplier, &output_shift);
	_gemmlowp_output_stage.configure(&_gemmlowp_output, biases, output, output_multiplier, output_shift, oq_info.offset);
	_gemmlowp_output.allocator()->allocate();
	}
	}

	Status CLFullyConnectedLayer::validate(const ITensorInfo input, const ITensorInfo weights, const ITensorInfo biases, const ITensorInfo output,
	FullyConnectedLayerInfo fc_info)
	{
	ARM_COMPUTE_RETURN_ERROR_ON_NULLPTR(input, weights, output);
	ARM_COMPUTE_RETURN_ERROR_ON_DATA_TYPE_CHANNEL_NOT_IN(input, 1, DataType::QASYMM8, DataType::F16, DataType::F32);
	ARM_COMPUTE_RETURN_ERROR_ON_MISMATCHING_DATA_TYPES(input, weights, output);
	ARM_COMPUTE_RETURN_ERROR_ON(weights->num_dimensions() > 2);

	bool weights_reshaped = fc_info.transpose_weights ? fc_info.are_weights_reshaped : true;
	bool is_fc_after_conv = true;
	bool is_quantized = is_data_type_quantized_asymmetric(input->data_type());
	const GPUTarget gpu_target = CLScheduler::get().target();

	const ITensorInfo &flatten_input = TensorInfo(input->clone()->set_is_resizable(true).reset_padding().set_tensor_shape(compute_flatten_shape(input)).set_data_layout(DataLayout::NCHW));
	const ITensorInfo &reshaped_weights = TensorInfo(weights->clone()->set_is_resizable(true).reset_padding().set_tensor_shape(compute_transposed_shape(*weights)));
	const ITensorInfo &converted_weights = weights_reshaped ? TensorInfo(weights->clone()->set_is_resizable(true).reset_padding()) : TensorInfo(*reshaped_weights.clone());
	const ITensorInfo &gemmlowp_output = TensorInfo(output->clone()->set_is_resizable(true).reset_padding().set_data_type(DataType::S32));

	// Configure accumulate biases kernel for non quantized asymmetric types
	if(biases != nullptr && !is_quantized)
	{
	ARM_COMPUTE_RETURN_ERROR_ON_MISMATCHING_DATA_TYPES(input, biases);
	ARM_COMPUTE_RETURN_ON_ERROR(CLGEMMMatrixAccumulateBiasesKernel::validate(output, biases, gpu_target));
	}

	// With the Fully Connected layer we can have 4 different cases:
	// 1) Convolution layer -> Fully Connected layer without batches
	// 2) Fully Connected layer -> Fully Connected layer without batches
	// 3) Convolution layer -> Fully Connected layer with batches
	// 4) Fully Connected layer -> Fully Connected layer with batches

	const ITensorInfo *input_to_use = input;
	const ITensorInfo *weights_to_use = weights;
	const ITensorInfo *tmp_output = (is_quantized) ? &gemmlowp_output : output;

	// Check if we have a fully connected layer with batches
	const bool is_batched_fc_layer = output->dimension(1) > 1;
	if(is_batched_fc_layer)
	{
	is_fc_after_conv = (TensorShape::num_max_dimensions >= 4) && (std::equal(input->tensor_shape().cbegin() + 3,
	input->tensor_shape().cend(),
	output->tensor_shape().cbegin() + 1));
	}
	else
	{
	is_fc_after_conv = input->num_dimensions() > 1;
	}

	if(!weights_reshaped)
	{
	// Validate reshape weights kernel
	ARM_COMPUTE_RETURN_ON_ERROR(CLFullyConnectedLayerReshapeWeights::validate(weights, &reshaped_weights));
	weights_to_use = &reshaped_weights;
	}

	if(is_fc_after_conv && (input->data_layout() != fc_info.weights_trained_layout))
	{
	// Validate convert weights kernel
	ARM_COMPUTE_RETURN_ON_ERROR(CLConvertFullyConnectedWeights::validate(weights_to_use,
	&converted_weights,
	input->tensor_shape(),
	fc_info.weights_trained_layout));
	weights_to_use = &converted_weights;
	}

	if(is_fc_after_conv)
	{
	// Fully Connected layer after a Convolution Layer without batches
	ARM_COMPUTE_RETURN_ERROR_ON((weights_to_use->dimension(1) != (input->dimension(0) * input->dimension(1) * input->dimension(2))));

	// Validate flatten kernel
	ARM_COMPUTE_RETURN_ON_ERROR(CLFlattenLayer::validate(input, &flatten_input));
	input_to_use = &flatten_input;
	}
	else
	{
	// Fully Connected layer after a Fully Connected Layer without batches
	ARM_COMPUTE_RETURN_ERROR_ON(input->dimension(0) != weights_to_use->dimension(1));
	}
	// Validate matrix multiply kernel
	ARM_COMPUTE_RETURN_ON_ERROR(validate_mm(input_to_use, weights_to_use, *tmp_output));

	// Validate output stage for asymmetric quantized types
	if(is_quantized)
	{
	const UniformQuantizationInfo iq_info = input->quantization_info().uniform();
	const UniformQuantizationInfo wq_info = weights->quantization_info().uniform();
	const UniformQuantizationInfo oq_info = output->quantization_info().uniform();
	const float multiplier = iq_info.scale * wq_info.scale / oq_info.scale;

	ARM_COMPUTE_UNUSED(multiplier);
	ARM_COMPUTE_RETURN_ERROR_ON(multiplier > 1.0f);
	ARM_COMPUTE_RETURN_ON_ERROR(CLGEMMLowpQuantizeDownInt32ToUint8ScaleByFixedPoint::validate(&gemmlowp_output, biases, output));
	}

	return Status{};
	}

	void CLFullyConnectedLayer::run()
	{
	prepare();

	MemoryGroupResourceScope scope_mg(_memory_group);

	// Linearize input if it comes from a convolutional layer
	if(_is_fc_after_conv)
	{
	_flatten_layer.run();
	}

	// Run matrix multiply
	if(_is_quantized)
	{
	_mm_gemmlowp.run();
	}
	else
	{
	_mm_gemm.run();
	}

	// Accumulate biases if provided
	if(_is_quantized)
	{
	_gemmlowp_output_stage.run();
	}
	else
	{
	if(_accumulate_biases)
	{
	CLScheduler::get().enqueue(_accumulate_biases_kernel);
	}
	}
	}

	void CLFullyConnectedLayer::prepare()
	{
	if(!_is_prepared)
	{
	ARM_COMPUTE_ERROR_ON(!_original_weights->is_used());

	auto release_unused = [](CLTensor * w)
	{
	if(!w->is_used())
	{
	CLScheduler::get().queue().finish();
	w->allocator()->free();
	}
	};

	// Pointer to current weights
	const ICLTensor *cur_weights = _original_weights;

	// Reshape of the weights if needed (happens only once)
	if(!_are_weights_reshaped)
	{
	// Run reshape weights kernel and mark weights as unused
	_reshape_weights_output.allocator()->allocate();
	_reshape_weights_kernel.run();

	cur_weights->mark_as_unused();
	cur_weights = &_reshape_weights_output;
	_are_weights_reshaped = true;
	}

	// Convert weights if needed (happens only once)
	if(!_are_weights_converted)
	{
	_converted_weights_output.allocator()->allocate();
	_convert_weights.run();

	cur_weights->mark_as_unused();
	_are_weights_converted = true;
	}

	// Release reshaped weights if unused
	release_unused(&_reshape_weights_output);

	// Prepare GEMM prepare and release unused weights
	if(!_is_quantized)
	{
	_mm_gemm.prepare();
	}

	// Release converted weights if unused
	release_unused(&_reshape_weights_output);
	release_unused(&_converted_weights_output);

	_is_prepared = true;
	}
	}