| /* |
| * 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/core/utils/quantization/AsymmHelpers.h" |
| #include "arm_compute/core/Helpers.h" |
| |
| #include <cmath> |
| #include <limits> |
| #include <numeric> |
| |
| namespace arm_compute |
| { |
| namespace quantization |
| { |
| constexpr int64_t fixed_point_one_Q0 = (1LL << 31); |
| constexpr float epsilon = 0.00001f; |
| |
| Status calculate_quantized_multiplier(float multiplier, int32_t *quant_multiplier, int32_t *shift) |
| { |
| if(multiplier >= 1.f) |
| { |
| Status status = calculate_quantized_multiplier_greater_than_one(multiplier, quant_multiplier, shift); |
| *shift *= -1; |
| return status; |
| } |
| else |
| { |
| return calculate_quantized_multiplier_less_than_one(multiplier, quant_multiplier, shift); |
| } |
| } |
| |
| Status calculate_quantized_multiplier_less_than_one(float multiplier, |
| int32_t *quant_multiplier, |
| int32_t *right_shift) |
| { |
| ARM_COMPUTE_RETURN_ERROR_ON(quant_multiplier == nullptr); |
| ARM_COMPUTE_RETURN_ERROR_ON(right_shift == nullptr); |
| ARM_COMPUTE_RETURN_ERROR_ON(multiplier < -epsilon); |
| ARM_COMPUTE_RETURN_ERROR_ON(multiplier > 1.0f + epsilon); |
| if(std::fabs(0.0f - multiplier) < epsilon) |
| { |
| *quant_multiplier = 0; |
| *right_shift = 0; |
| return Status{}; |
| } |
| |
| int shift_exp = 0; |
| const double q = std::frexp(multiplier, &shift_exp); |
| *right_shift = -1 * shift_exp; |
| auto q_fixed = static_cast<int64_t>(support::cpp11::round(q * fixed_point_one_Q0)); |
| ARM_COMPUTE_RETURN_ERROR_ON(q_fixed > fixed_point_one_Q0); |
| if(q_fixed == fixed_point_one_Q0) |
| { |
| q_fixed /= 2; |
| --*right_shift; |
| } |
| ARM_COMPUTE_RETURN_ERROR_ON(*right_shift < 0); |
| ARM_COMPUTE_RETURN_ERROR_ON(q_fixed > std::numeric_limits<int32_t>::max()); |
| *quant_multiplier = static_cast<int32_t>(q_fixed); |
| |
| return Status{}; |
| } |
| |
| Status calculate_quantized_multiplier_greater_than_one(float multiplier, |
| int32_t *quantized_multiplier, |
| int32_t *left_shift) |
| { |
| ARM_COMPUTE_RETURN_ERROR_ON(quantized_multiplier == nullptr); |
| ARM_COMPUTE_RETURN_ERROR_ON(left_shift == nullptr); |
| ARM_COMPUTE_RETURN_ERROR_ON(multiplier < 1.f); |
| |
| int shift_exp = 0; |
| const double q = std::frexp(multiplier, &shift_exp); |
| *left_shift = shift_exp; |
| auto q_fixed = static_cast<int64_t>(support::cpp11::round(q * fixed_point_one_Q0)); |
| ARM_COMPUTE_RETURN_ERROR_ON(q_fixed > fixed_point_one_Q0); |
| if(q_fixed == fixed_point_one_Q0) |
| { |
| q_fixed /= 2; |
| ++*left_shift; |
| } |
| ARM_COMPUTE_RETURN_ERROR_ON(*left_shift < 0); |
| ARM_COMPUTE_RETURN_ERROR_ON(q_fixed > std::numeric_limits<int32_t>::max()); |
| *quantized_multiplier = static_cast<int32_t>(q_fixed); |
| |
| return Status{}; |
| } |
| |
| arm_compute::Status calculate_quantized_multipliers_less_than_one(const QuantizationInfo &iq_info, |
| const QuantizationInfo &wq_info, |
| const QuantizationInfo &oq_info, |
| GEMMLowpOutputStageInfo &stage_info) |
| { |
| ARM_COMPUTE_RETURN_ERROR_ON(iq_info.scale().empty()); |
| ARM_COMPUTE_RETURN_ERROR_ON(wq_info.scale().empty()); |
| ARM_COMPUTE_RETURN_ERROR_ON(oq_info.scale().empty()); |
| |
| const unsigned int size = wq_info.scale().size(); |
| |
| auto &quant_multipliers = stage_info.gemmlowp_multipliers; |
| auto &quant_shifts = stage_info.gemmlowp_shifts; |
| quant_multipliers.resize(size); |
| quant_shifts.resize(size); |
| |
| const auto &w_scales = wq_info.scale(); |
| const float i_scale = iq_info.scale().at(0); |
| const float o_scale = oq_info.scale().at(0); |
| |
| for(unsigned int i = 0; i < size; ++i) |
| { |
| const float multiplier = i_scale * w_scales[i] / o_scale; |
| int32_t quant_multiplier = 0; |
| int32_t quant_shift = 0; |
| ARM_COMPUTE_RETURN_ON_ERROR(calculate_quantized_multiplier_less_than_one(multiplier, &quant_multiplier, &quant_shift)); |
| quant_multipliers[i] = quant_multiplier; |
| quant_shifts[i] = quant_shift; |
| } |
| |
| // Legacy part |
| stage_info.gemmlowp_shift = quant_shifts[0]; |
| stage_info.gemmlowp_multiplier = quant_multipliers[0]; |
| |
| return Status{}; |
| } |
| |
| std::pair<int, int> get_min_max_values_from_quantized_data_type(DataType data_type) |
| { |
| int min_quant_val = 0; |
| int max_quant_val = 0; |
| switch(data_type) |
| { |
| case DataType::QASYMM8: |
| min_quant_val = std::numeric_limits<uint8_t>::min(); |
| max_quant_val = std::numeric_limits<uint8_t>::max(); |
| break; |
| case DataType::QSYMM8: |
| min_quant_val = std::numeric_limits<int8_t>::min(); |
| max_quant_val = std::numeric_limits<int8_t>::max(); |
| break; |
| case DataType::QASYMM16: |
| min_quant_val = std::numeric_limits<uint16_t>::min(); |
| max_quant_val = std::numeric_limits<uint16_t>::max(); |
| break; |
| case DataType::QSYMM16: |
| min_quant_val = std::numeric_limits<int16_t>::min(); |
| max_quant_val = std::numeric_limits<int16_t>::max(); |
| break; |
| default: |
| ARM_COMPUTE_ERROR("Unsupported data type"); |
| } |
| return std::make_pair(min_quant_val, max_quant_val); |
| } |
| void compute_quantized_multipliers_and_shifts(const ITensorInfo *input, |
| const ITensorInfo *weights, |
| const ITensorInfo *output, |
| unsigned int idx_ofms, |
| int32_t *output_multipliers_ptr, |
| int32_t *output_shifts_ptr) |
| { |
| const unsigned int num_filters = is_data_type_quantized_per_channel(weights->data_type()) ? weights->dimension(idx_ofms) : 1; |
| |
| const UniformQuantizationInfo iq_info = input->quantization_info().uniform(); |
| const QuantizationInfo wq_info = weights->quantization_info(); |
| const UniformQuantizationInfo oq_info = output->quantization_info().uniform(); |
| |
| for(unsigned int i = 0; i < num_filters; ++i) |
| { |
| int32_t output_multiplier = 0; |
| int32_t output_shift = 0; |
| const float multiplier = iq_info.scale * wq_info.scale()[i] / oq_info.scale; |
| calculate_quantized_multiplier(multiplier, &output_multiplier, &output_shift); |
| |
| output_multipliers_ptr[i] = output_multiplier; |
| output_shifts_ptr[i] = output_shift; |
| } |
| } |
| } // quantization |
| } // arm_compute |