---
title: BroadcastInferShape
description: "对于满足broadcast关系（广播规则介绍参考NumPy(https://numpy.org/doc/stable/user/basics.broadcasting.html)官网）的两个shape，推导其broadcast后的shape。例如[1, 10]与[2, 1] broadcast后的shape为[2, 10]。"
url: https://www.hiascend.com/document/detail/zh/canncommercial/latest/API/aolapi/atlasascendc_api_07_1147.html
sourcePath: /source/zh/canncommercial/900/API/aolapi/atlasascendc_api_07_1147.html
indexId: eb3440947d537181f3ae37157db3e252ff561d942ee75b71c985464bcfa5810770
---
# BroadcastInferShape

#### 功能说明

对于满足broadcast关系（广播规则介绍参考NumPy(https://numpy.org/doc/stable/user/basics.broadcasting.html)官网）的两个shape，推导其broadcast后的shape。例如[1, 10]与[2, 1] broadcast后的shape为[2, 10]。


#### 函数原型

```
bool BroadcastInferShape(const op::Shape &self, const op::Shape &other, op::Shape &broadcastShape)
```


#### 参数说明

| 参数 | 输入/输出 | 说明 |
| --- | --- | --- |
| self | 输入 | 第一组shape。 |
| other | 输入 | 第二组shape。 |
| broadcastShape | 输出 | self和other经过broadcast后推导的shape。 |


#### 返回值说明

当self与other满足broadcast关系时，返回true，否则返回false。


#### 约束说明

无


#### 调用示例

```
// 生成shape为[2,1]和[2,10]的两个Shape对象，获取broadcast后的shape。
void Func() {
    gert::Shape shapeA;
    shapeA.AppendDim(1);
    shapeA.AppendDim(2);
    gert::Shape shapeB;
    shapeB.AppendDim(10);
    shapeB.AppendDim(2);
    gert::Shape shapeBrc;
    bool isBrc = BroadcastInferShape(shapeA, shapeB, shapeBrc);
}
```