MindSpore报错AttributeError:‘NoneType‘ has no attribute...
1 报错描述
1.1 系统环境
Hardware Environment(Ascend/GPU/CPU): GPU
Software Environment:
– MindSpore version (source or binary): 1.6.0
– Python version (e.g., Python 3.7.5): 3.7.6
– OS platform and distribution (e.g., Linux Ubuntu 16.04): Ubuntu 4.15.0-74-generic
– GCC/Compiler version (if compiled from source):
1.2 基本信息
1.2.1 脚本
训练脚本是通过图模式测试自定义Parameter类，构建MatMul单算子网络的例子。脚本如下：
01 class my_paramter(Parameter):
02 def __init__(self, data, requires_grad):
03 super(my_paramter, self).__init__(data, requires_grad)
04 self.name = None
05
06 class Net(nn.Cell):
07 def __init__(self):
08 super(Net, self).__init__()
09 self.matmul = ops.MatMul()
10 self.weight = my_paramter(Tensor(np.ones((1, 2)), mindspore.float32),name='w', requires_grad=True)
11
12 def construct(self, x):
13 out = self.matmul(self.weight, x)
14 return out
15
16 net = Net()
17 x = Tensor(np.ones((2, 1)), mindspore.float32)
18 output = net(x)
19 print('output:',output)
1.2.2 报错
这里报错信息如下：
Traceback (most recent call last):
File "/home/test/demo.py", line 16, in <module>
net = Net()
File "/home/test/demo.py", line 10, in __init__
self.weight = my_paramter(Tensor(np.ones((1, 2)), mindspore.float32),name='w', requires_grad=True)
File "test/lib/python3.9/site-packages/mindspore/nn/cell.py", line 590, in __setattr__
self._set_attr_for_parameter(name, value)
File "test/lib/python3.9/site-packages/mindspore/nn/cell.py", line 492, in _set_attr_for_parameter
self.insert_param_to_cell(name, value)
File "test/lib/python3.9/site-packages/mindspore/nn/cell.py", line 798, in insert_param_to_cell
if isinstance(param, Parameter) and param.name == PARAMETER_NAME_DEFAULT:
File "test/lib/python3.9/site-packages/mindspore/common/parameter.py", line 300, in name
return self.param_info.name
AttributeError: 'NoneType' object has no attribute 'name'.
原因分析
在MindSpore1.6版本，在construct中创建和使用Tensor。如脚本中第16行代码所示。
接着看报错信息，在AttributeError中，写到*‘NoneType’ object has no attribute ‘name’*，意思是’NoneType’对象没有name属性，这是由于Parameter不允许派生子类，因此不能自行定义类Parameter。建议采用官方Parameter算子进行初始化。
2 解决方法
基于上面已知的原因，很容易做出如下修改：
01 class Net(nn.Cell):
02 def __init__(self):
03 super(Net, self).__init__()
04 self.matmul = ops.MatMul()
05 self.weight = Parameter(Tensor(np.ones((1, 2)), mindspore.float32),name='w', requires_grad=True)
06
07 def construct(self, x):
08 out = self.matmul(self.weight, x)
09 return out
10
11 net = Net()
12 x = Tensor(np.ones((2, 1)), mindspore.float32)
13 output = net(x)
14 print('output:',output)
此时执行成功，输出如下：
output: [[2.]]
3 总结
定位报错问题的步骤：
1、 找到报错的用户代码行：self.weight = my_paramter(Tensor(np.ones((1, 2)), mindspore.float32),name=‘w’, requires_grad=True);
2、 根据日志报错信息中的关键字，缩小分析问题的范围: ‘NoneType’ object has no attribute ‘name’;
3、 需要重点关注变量定义、初始化的正确性。