| /* |
| * Copyright (c) 2017-2020 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_QUANTIZATION_ASYMM_HELPERS_H |
| #define ARM_COMPUTE_QUANTIZATION_ASYMM_HELPERS_H |
| |
| #include "arm_compute/core/Error.h" |
| #include "arm_compute/core/ITensor.h" |
| #include "arm_compute/core/Types.h" |
| |
| namespace arm_compute |
| { |
| namespace quantization |
| { |
| /** Calculate quantized representation of multiplier. |
| * |
| * @param[in] multiplier Real multiplier. |
| * @param[out] quant_multiplier Integer multiplier. |
| * @param[out] shift bit shift. A negative value indicates a left shift, while a positive value indicates a right shift |
| * @param[in] ignore_epsilon When true, ignore pre-defined epsilon value. Defaults to false |
| * |
| * @return a status |
| */ |
| Status calculate_quantized_multiplier(float multiplier, int32_t *quant_multiplier, int32_t *shift, bool ignore_epsilon = false); |
| /** Calculate quantized representation of multiplier with value less than one. |
| * |
| * @param[in] multiplier Real multiplier. |
| * @param[out] quant_multiplier Integer multiplier. |
| * @param[out] right_shift Right bit shift. |
| * @param[in] ignore_epsilon When true, ignore pre-defined epsilon value. Defaults to false |
| * |
| * @return a status |
| */ |
| Status calculate_quantized_multiplier_less_than_one(float multiplier, int32_t *quant_multiplier, int32_t *right_shift, bool ignore_epsilon = false); |
| /** Calculate quantized representation of multiplier having value greater than one. |
| * |
| * @param[in] multiplier Real multiplier. |
| * @param[out] quantized_multiplier Integer multiplier. |
| * @param[out] left_shift Left bit shift. |
| * |
| * @return a status |
| */ |
| Status calculate_quantized_multiplier_greater_than_one(float multiplier, int32_t *quantized_multiplier, int32_t *left_shift); |
| |
| /** Calculate quantized representation of per-channel multipliers |
| * |
| * @param[in] iq_info Input quantization info. |
| * @param[in] wq_info Weights quantization info. |
| * @param[in] oq_info Output quantization info. |
| * @param[in, out] stage_info GemmLowp output stage info |
| * |
| * @return a status |
| */ |
| Status calculate_quantized_multipliers(const QuantizationInfo &iq_info, |
| const QuantizationInfo &wq_info, |
| const QuantizationInfo &oq_info, |
| GEMMLowpOutputStageInfo &stage_info); |
| |
| /** Get minimum and maximum values for the input quantized data type |
| * |
| * @return min and max values for the quantized data type |
| */ |
| std::pair<int, int> get_min_max_values_from_quantized_data_type(DataType data_type); |
| /** Compute quantized per-channel multipliers and shifts. As many multipliers |
| * and shifts as output channels are computed. If weights are not quantized |
| * per-channel, multipliers and shifts will end up being the same for each |
| * channel. |
| * |
| * @param[in] input Input tensor info. |
| * @param[in] weights Weights tensor info. |
| * @param[in] output Output tensor info. |
| * @param[in] idx_ofms Dimension index to get OFMs from the weights tensor. |
| * @param[out] output_multipliers_ptr Pointer to the buffer where to store per-channel multipliers. |
| * @param[out] output_shifts_ptr Pointer to the buffer where to store per-channel shifts. |
| * |
| * @return min and max values for the quantized data type |
| */ |
| 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); |
| |
| /** Round to the nearest division by a power-of-two using exponent, copied from NEMath |
| * |
| * @note This function calculates the following expression: (x + 2^n -1 ) / 2^n where n = exponent |
| * |
| * @param[in] x Element to divide. |
| * @param[in] exponent Integer value used to round to nearest division by a power-of-two |
| * |
| * @return the nearest division by a power-of-two using exponent |
| */ |
| int32_t rounding_divide_by_pow2(int32_t x, int exponent); |
| |
| /** Compute multiplication of two integers |
| * |
| * @param[in] a One integer to multiply |
| * @param[in] b Another integer to multiply |
| * |
| * @return The multiplied value |
| */ |
| int32_t saturating_rounding_doubling_highmul(int32_t a, int32_t b); |
| |
| /** Compute the value multiplied by given quantized multiplier and shift |
| * |
| * @param[in] input Target value to multiply. |
| * @param[in] qmul Quantized multipler |
| * @param[in] shift Left bit shift |
| * |
| * @return The multiplied value |
| */ |
| int32_t multiply_by_quantized_multiplier(int32_t input, int32_t qmul, int32_t shift); |
| |
| /** Compute the value multiplied the power-of-two |
| * |
| * @param[in] exponent Exponent used to calculate power-of-two |
| * @param[in] v Target value to multiply |
| * |
| * @return The multiplied value |
| */ |
| int32_t saturating_rounding_multiply_by_pow2(int32_t exponent, int32_t v); |
| |
| /** Compute quantized multiplier and shift for the inverse square root of input. |
| * Using 3-bit fixed point and 5 iteration of Newton-Raphson method. |
| * |
| * @param[in] input Input to use |
| * @param[in] reverse_shift -1 to reverse the shift direction |
| * @param[out] output_inv_sqrt Quantized multiplier for inverse square root |
| * @param[out] output_shift Shift for inverse square root |
| * |
| */ |
| void get_invsqrt_quantized_multiplier_exp(int32_t input, int32_t reverse_shift, int32_t &output_inv_sqrt, int32_t &output_shift); |
| |
| } // namespace quantization |
| } // namespace arm_compute |
| #endif /* ARM_COMPUTE_IO_FILE_HANDLER_H */ |