Python getattr called and enter infinite recursion even the attribute is not missing

Question

I define a NE_Conv2d class and override its __getattr__. When I try to get an existing attribute from one instance of this class, __getattr__ is called and enter infinite recursion.

I know one need to deal with __getattr__ carefully to avoid infinite recursion, but apparently the conv attribute already exists after __init__ is called. So when I try to get conv attribute, __getattr__ should not be called.

from torch import nn
class NE_Conv2d(nn.Module):
    '''Nonexpansive conv2d'''

    def __init__(self, *k, **kw):
        super(NE_Conv2d, self).__init__()
        self.conv = nn.Conv2d(*k, **kw)
        print('foo')

    def __getattr__(self, attr):
        return getattr(self.conv, attr)

a = NE_Conv2d(3, 32, 5)
print(a)
print(a.conv)

Above code should print info about a and a.conv, but enter infinite recursion when trying to get a.conv.

__getattr__ is only called if an attribute (conv here) is not found on an object. In this case self.conv is assigned in the __init__ method so __getattr__ will not be called if a.conv is accessed. — snakecharmerb
– snakecharmerb, Commented Jun 8, 2019 at 7:45
My thought is same as yours and that's the reason why I am totally confused when I run the above code and got RecursionError: maximum recursion depth exceeded error. — nanimonai
– nanimonai, Commented Jun 8, 2019 at 8:01

nanimonai · Accepted Answer · 2019-08-09 07:12:16Z

0

I seem to know what's wrong... setattr and getattr of nn.Module is reloaded...

answered Aug 9, 2019 at 7:12

nanimonai

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