File size: 3,516 Bytes
be903e2 | 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 | // Tencent is pleased to support the open source community by making ncnn available.
//
// Copyright (C) 2021 THL A29 Limited, a Tencent company. All rights reserved.
//
// Licensed under the BSD 3-Clause License (the "License"); you may not use this file except
// in compliance with the License. You may obtain a copy of the License at
//
// https://opensource.org/licenses/BSD-3-Clause
//
// 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 "utils.h"
namespace pnnx {
const torch::jit::Node* find_node_by_kind(const std::shared_ptr<torch::jit::Graph>& graph, const std::string& kind)
{
for (const auto& n : graph->nodes())
{
if (n->kind().toDisplayString() == kind)
return n;
}
return 0;
}
unsigned short float32_to_float16(float value)
{
// 1 : 8 : 23
union
{
unsigned int u;
float f;
} tmp;
tmp.f = value;
// 1 : 8 : 23
unsigned short sign = (tmp.u & 0x80000000) >> 31;
unsigned short exponent = (tmp.u & 0x7F800000) >> 23;
unsigned int significand = tmp.u & 0x7FFFFF;
// NCNN_LOGE("%d %d %d", sign, exponent, significand);
// 1 : 5 : 10
unsigned short fp16;
if (exponent == 0)
{
// zero or denormal, always underflow
fp16 = (sign << 15) | (0x00 << 10) | 0x00;
}
else if (exponent == 0xFF)
{
// infinity or NaN
fp16 = (sign << 15) | (0x1F << 10) | (significand ? 0x200 : 0x00);
}
else
{
// normalized
short newexp = exponent + (-127 + 15);
if (newexp >= 31)
{
// overflow, return infinity
fp16 = (sign << 15) | (0x1F << 10) | 0x00;
}
else if (newexp <= 0)
{
// Some normal fp32 cannot be expressed as normal fp16
fp16 = (sign << 15) | (0x00 << 10) | 0x00;
}
else
{
// normal fp16
fp16 = (sign << 15) | (newexp << 10) | (significand >> 13);
}
}
return fp16;
}
float float16_to_float32(unsigned short value)
{
// 1 : 5 : 10
unsigned short sign = (value & 0x8000) >> 15;
unsigned short exponent = (value & 0x7c00) >> 10;
unsigned short significand = value & 0x03FF;
// NCNN_LOGE("%d %d %d", sign, exponent, significand);
// 1 : 8 : 23
union
{
unsigned int u;
float f;
} tmp;
if (exponent == 0)
{
if (significand == 0)
{
// zero
tmp.u = (sign << 31);
}
else
{
// denormal
exponent = 0;
// find non-zero bit
while ((significand & 0x200) == 0)
{
significand <<= 1;
exponent++;
}
significand <<= 1;
significand &= 0x3FF;
tmp.u = (sign << 31) | ((-exponent + (-15 + 127)) << 23) | (significand << 13);
}
}
else if (exponent == 0x1F)
{
// infinity or NaN
tmp.u = (sign << 31) | (0xFF << 23) | (significand << 13);
}
else
{
// normalized
tmp.u = (sign << 31) | ((exponent + (-15 + 127)) << 23) | (significand << 13);
}
return tmp.f;
}
} // namespace pnnx
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