| /* Copyright 2020 The TensorFlow Authors. All Rights Reserved. |
| |
| 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 "tensorflow/lite/kernels/internal/reference/fully_connected.h" |
| |
| #include <xtensa/tie/xt_hifi2.h> |
| |
| #include "tensorflow/lite/c/builtin_op_data.h" |
| #include "tensorflow/lite/c/common.h" |
| #include "tensorflow/lite/kernels/internal/common.h" |
| #include "tensorflow/lite/kernels/internal/quantization_util.h" |
| #include "tensorflow/lite/kernels/internal/reference/integer_ops/fully_connected.h" |
| #include "tensorflow/lite/kernels/internal/tensor_ctypes.h" |
| #include "tensorflow/lite/kernels/kernel_util.h" |
| #include "tensorflow/lite/micro/kernels/xtensa_hifimini/fixedpoint_utils.h" |
| |
| namespace tflite { |
| namespace ops { |
| namespace micro { |
| |
| namespace xtensa { |
| namespace hifimini { |
| |
| void FullyConnected(const FullyConnectedParams& params, |
| const RuntimeShape& input_shape, const int8_t* input_data, |
| const RuntimeShape& filter_shape, const int8_t* filter_data, |
| const RuntimeShape& bias_shape, const int32* bias_data, |
| const RuntimeShape& output_shape, int8_t* output_data) { |
| // TODO(b/154032858): Investigate removing extra copies. |
| const int32 input_offset = params.input_offset; |
| const int32 filter_offset = params.weights_offset; |
| const int32 output_offset = params.output_offset; |
| const int32 output_multiplier = params.output_multiplier; |
| const int output_shift = params.output_shift; |
| const int32 output_activation_min = params.quantized_activation_min; |
| const int32 output_activation_max = params.quantized_activation_max; |
| |
| const int filter_dim_count = filter_shape.DimensionsCount(); |
| const int batches = output_shape.Dims(0); |
| const int output_depth = output_shape.Dims(1); |
| const int accum_depth = filter_shape.Dims(filter_dim_count - 1); |
| const int accum_depth_iters = accum_depth / 2; |
| |
| ae_p24x2s offsets_input_24x2 = AE_MOVPA24(input_offset); |
| ae_p24x2s offsets_filter_24x2 = AE_MOVPA24(filter_offset); |
| ae_q56s output_offset_56 = AE_CVTQ48A32S(output_offset); |
| ae_q56s output_activation_max_56 = AE_CVTQ48A32S(output_activation_max); |
| ae_q56s output_activation_min_56 = AE_CVTQ48A32S(output_activation_min); |
| |
| for (int b = 0; b < batches; ++b) { |
| for (int out_c = 0; out_c < output_depth; ++out_c) { |
| // Load intrinsics advance pointer before loading so backoff data pointers |
| // by two before loading: |
| const int8_t* input_ptr = (input_data + b * accum_depth) - 2; |
| const int8_t* filter_ptr = (filter_data + out_c * accum_depth) - 2; |
| |
| // Main accumulator register entry for loop: |
| ae_q56s sum_56 = AE_ZEROQ56(); |
| |
| for (int d = 0; d < accum_depth_iters; d++) { |
| // Load the signed 8bit values into the PR register: |
| ae_p24x2s input_24x2; |
| ae_p24x2s filter_24x2; |
| AE_LP8X2F_IU(input_24x2, input_ptr, 2); |
| AE_LP8X2F_IU(filter_24x2, filter_ptr, 2); |
| |
| // Right shift the signed 8bit values to expand to signed 24bit values: |
| input_24x2 = AE_P24X2S_SRAI(input_24x2, 16); |
| filter_24x2 = AE_P24X2S_SRAI(filter_24x2, 16); |
| |
| // Add offsets to data values (24 bit aligned): |
| input_24x2 = AE_P24S_ADDS_P24X2S(offsets_input_24x2, input_24x2); |
| filter_24x2 = AE_P24S_ADDS_P24X2S(offsets_filter_24x2, filter_24x2); |
| |
| // 24x2 signed integer dual MAC w/ addition into 56bit accumulator (48 |
| // bit aligned): |
| AE_MULAAP24S_HH_LL(sum_56, input_24x2, filter_24x2); |
| } |
| |
| // Left shift to get back into 32bit space (right padded to 48bit): |
| sum_56 = AE_Q56S_SLAI(sum_56, 16); |
| |
| // Add bias data if needed: |
| if (bias_data) { |
| ae_q56s bias_56 = AE_CVTQ48A32S(bias_data[out_c]); |
| sum_56 = AE_ADDQ56(sum_56, bias_56); |
| } |
| |
| // Shift left into 24bit space and place back on PR register: |
| sum_56 = AE_Q56S_SLAI(sum_56, 8); |
| ae_p24x2s sum_24x2 = AE_TRUNCP24Q48(sum_56); |
| |
| // MultiplyByQuantizedMultiplier returns a 48bit aligned value |
| sum_56 = MultiplyByQuantizedMultiplier(sum_24x2, output_multiplier, |
| output_shift); |
| |
| // Add output_offset and cap min/max values: |
| sum_56 = AE_ADDQ56(sum_56, output_offset_56); |
| sum_56 = AE_MINQ56S(sum_56, output_activation_max_56); |
| sum_56 = AE_MAXQ56S(sum_56, output_activation_min_56); |
| |
| output_data[out_c + output_depth * b] = |
| static_cast<int8_t>(AE_TRUNCA32Q48(sum_56)); |
| } |
| } |
| } |
| |
| } // namespace hifimini |
| } // namespace xtensa |
| |
| namespace fully_connected { |
| namespace { |
| |
| struct OpData { |
| // The scaling factor from input to output (aka the 'real multiplier') can |
| // be represented as a fixed point multiplier plus a left shift. |
| int32_t output_multiplier; |
| int output_shift; |
| // The range of the fused activation layer. For example for kNone and |
| // uint8_t these would be 0 and 255. |
| int32_t output_activation_min; |
| int32_t output_activation_max; |
| // The index of the temporary tensor where the quantized inputs are cached. |
| int input_quantized_index; |
| }; |
| |
| constexpr int kInputTensor = 0; |
| constexpr int kWeightsTensor = 1; |
| constexpr int kBiasTensor = 2; |
| constexpr int kOutputTensor = 0; |
| |
| TfLiteStatus CalculateOpData(TfLiteContext* context, |
| TfLiteFusedActivation activation, |
| TfLiteType data_type, const TfLiteTensor* input, |
| const TfLiteTensor* filter, |
| const TfLiteTensor* bias, TfLiteTensor* output, |
| OpData* data) { |
| TFLITE_DCHECK(data_type != kTfLiteFloat32); |
| |
| double real_multiplier = 0.0; |
| TF_LITE_ENSURE_STATUS(GetQuantizedConvolutionMultipler( |
| context, input, filter, bias, output, &real_multiplier)); |
| xtensa::hifimini::QuantizeMultiplier( |
| real_multiplier, &data->output_multiplier, &data->output_shift); |
| return CalculateActivationRangeQuantized(context, activation, output, |
| &data->output_activation_min, |
| &data->output_activation_max); |
| } |
| |
| } // namespace |
| |
| void* Init(TfLiteContext* context, const char* buffer, size_t length) { |
| TFLITE_DCHECK(context->AllocatePersistentBuffer != nullptr); |
| return context->AllocatePersistentBuffer(context, sizeof(OpData)); |
| } |
| |
| TfLiteStatus Prepare(TfLiteContext* context, TfLiteNode* node) { |
| TFLITE_DCHECK(node->user_data != nullptr); |
| TFLITE_DCHECK(node->builtin_data != nullptr); |
| |
| OpData* data = static_cast<OpData*>(node->user_data); |
| const auto* params = |
| reinterpret_cast<TfLiteFullyConnectedParams*>(node->builtin_data); |
| |
| const TfLiteTensor* input = GetInput(context, node, kInputTensor); |
| const TfLiteTensor* filter = GetInput(context, node, kWeightsTensor); |
| const TfLiteTensor* bias = GetOptionalInputTensor(context, node, kBiasTensor); |
| TfLiteTensor* output = GetOutput(context, node, kOutputTensor); |
| |
| return CalculateOpData(context, params->activation, input->type, input, |
| filter, bias, output, data); |
| } |
| |
| TfLiteStatus EvalQuantizedInt8(TfLiteContext* context, TfLiteNode* node, |
| const OpData& data, const TfLiteTensor* input, |
| const TfLiteTensor* filter, |
| const TfLiteTensor* bias, TfLiteTensor* output) { |
| // TODO(b/154032858): Investigate removing extra copies, and also passing by |
| // value. TODO(b/155656675): Consider passing OpData by value once it is also |
| // passed to the FullyConnected function. Until it is copied to a local |
| // op_param variable, we do not get any latency improvements from passing by |
| // value. |
| FullyConnectedParams op_params; |
| op_params.input_offset = -input->params.zero_point; |
| op_params.weights_offset = -filter->params.zero_point; |
| op_params.output_offset = output->params.zero_point; |
| op_params.output_multiplier = data.output_multiplier; |
| op_params.output_shift = data.output_shift; |
| op_params.quantized_activation_min = data.output_activation_min; |
| op_params.quantized_activation_max = data.output_activation_max; |
| |
| xtensa::hifimini::FullyConnected( |
| op_params, GetTensorShape(input), GetTensorData<int8_t>(input), |
| GetTensorShape(filter), GetTensorData<int8_t>(filter), |
| GetTensorShape(bias), GetTensorData<int32_t>(bias), |
| GetTensorShape(output), GetTensorData<int8_t>(output)); |
| return kTfLiteOk; |
| } |
| |
| TfLiteStatus Eval(TfLiteContext* context, TfLiteNode* node) { |
| TFLITE_DCHECK(node->user_data != nullptr); |
| const OpData& data = *(static_cast<const OpData*>(node->user_data)); |
| |
| const TfLiteTensor* input = GetInput(context, node, kInputTensor); |
| const TfLiteTensor* filter = GetInput(context, node, kWeightsTensor); |
| const TfLiteTensor* bias = GetOptionalInputTensor(context, node, kBiasTensor); |
| TfLiteTensor* output = GetOutput(context, node, kOutputTensor); |
| |
| TFLITE_DCHECK(filter->type == kTfLiteInt8); |
| return EvalQuantizedInt8(context, node, data, input, filter, bias, output); |
| } |
| |
| } // namespace fully_connected |
| |
| TfLiteRegistration Register_FULLY_CONNECTED() { |
| return {/*init=*/fully_connected::Init, |
| /*free=*/nullptr, |
| /*prepare=*/fully_connected::Prepare, |
| /*invoke=*/fully_connected::Eval, |
| /*profiling_string=*/nullptr, |
| /*builtin_code=*/0, |
| /*custom_name=*/nullptr, |
| /*version=*/0}; |
| } |
| |
| } // namespace micro |
| } // namespace ops |
| } // namespace tflite |