---
title: BYTE_SIZE_MAP
description: "提供数据类型大小。"
url: https://www.hiascend.com/document/detail/zh/mindie/latest/mindiellm/llmdev/mindie_llm0145.html
sourcePath: /source/zh/mindie/310/mindiellm/llmdev/mindie_llm0145.html
indexId: c67247521d0293ca7f8f076c305fc2d7e89370d233b1958a8af5a5e1482f8cb558
---
# BYTE_SIZE_MAP

#### 枚举类功能

提供数据类型大小。


#### 枚举类格式

```
const std::unordered_map<InferDataType, size_t> BYTE_SIZE_MAP = {
{InferDataType::TYPE_INVALID, 0},
{InferDataType::TYPE_BOOL, sizeof(bool)},
{InferDataType::TYPE_UINT8, sizeof(uint8_t)},
{InferDataType::TYPE_UINT16, sizeof(uint16_t)},
{InferDataType::TYPE_UINT32, sizeof(uint32_t)},
{InferDataType::TYPE_UINT64, sizeof(uint64_t)},
{InferDataType::TYPE_INT8, sizeof(int8_t)},
{InferDataType::TYPE_INT16, sizeof(int16_t)},
{InferDataType::TYPE_INT32, sizeof(int32_t)},
{InferDataType::TYPE_INT64, sizeof(int64_t)},
{InferDataType::TYPE_FP16, sizeof(int16_t)},    // float16 类型不一定支持
{InferDataType::TYPE_FP32, sizeof(float)},
{InferDataType::TYPE_FP64, sizeof(double)},
{InferDataType::TYPE_STRING, 0},                // 长度不确定
{InferDataType::TYPE_BF16, sizeof(int16_t)},    // bfloat16 类型不一定支持
};
```