Construct内报错和定位解决

quote="Hanshize, post:1, topic:985, full:true"

1 系统环境

硬件环境(Ascend/GPU/CPU): CPU MindSpore版本: 1.9 执行模式: 静态图 Python版本: 3.7.5 操作系统平台: linux

2 报错信息

2.1 问题描述

有一个模型，在construct里进行了一些计算，计算完毕后想删除某个tensor

2.2 报错信息

arduino 复制代码

Traceback (most recent call last):
  File "D:/cons.py", line 11, in <module>
    m(1, 2)
  File "D:\python3.7\lib\site-packages\mindspore\nn\cell.py", line 622, in __call__
    out = self.compile_and_run(*args)
  File "D:\python3.7\lib\site-packages\mindspore\nn\cell.py", line 1007, in compile_and_run
    self.compile(*inputs)
  File "D:\python3.7\lib\site-packages\mindspore\nn\cell.py", line 979, in compile
    jit_config_dict=self._jit_config_dict)
  File "D:\python3.7\lib\site-packages\mindspore\common\api.py", line 1147, in compile
    result = self._graph_executor.compile(obj, args_list, phase, self._use_vm_mode())
RuntimeError: Unsupported statement 'Delete'.
More details please refer to syntax support at https://www.mindspore.cn

----------------------------------------------------
- The Traceback of Net Construct Code:
----------------------------------------------------

# In file D:/cons.py:9
        del a
        ^

----------------------------------------------------
- C++ Call Stack: (For framework developers)
----------------------------------------------------
mindspore\ccsrc\pipeline\jit\parse\parse.cc:772 mindspore::parse::Parser::ParseStatement


Process finished with exit code 1

2.3 脚本代码

python 复制代码

from mindspore import nn
import mindspore as ms

ms.set_context(mode=ms.GRAPH_MODE)
class Model(nn.Cell):
    def construct(self, x, y):
        a = x + 1
        y = a + y
        del a
        return y

m = Model()
m(1, 2)

3 根因分析

在Graph模式下，Python代码并不是由Python解释器去执行，而是将代码编译成静态计算图，然后执行静态计算图。由于语法解析的限制，当前在编译构图时，支持的数据类型、语法以及相关操作并没有完全与Python语法保持一致，部分使用受限。具体参考：静态图语法支持 | MindSpore 1.8 文档 | 昇思MindSpore社区出错的代码 gitee.com/mindspore/m...

从说明文档和代码上都能看出del不被支持

4 解决方案

不用del，将变量置None

ini 复制代码

from mindspore import nn
import mindspore as ms

ms.set_context(mode=ms.GRAPH_MODE)
class Model(nn.Cell):
    def construct(self, x, y):
        a = x + 1
        y = a + y
        a = None
        return y

m = Model()
m(1, 2)

/quote