1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
|
/*
* Copyright (c) 2017-2021, 2023 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[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.
*/
void compute_quantized_multipliers_and_shifts(const ITensorInfo *input,
const ITensorInfo *weights,
const ITensorInfo *output,
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 */
|
