what is ".class.name__" attribute of an python object?

Question

I was going through pytorch codebase for face generation using DCGAN and come across this code.

def weights_init(m):
    classname = m.__class__.__name__
    if classname.find('Conv') != -1:
        nn.init.normal_(m.weight.data, 0.0, 0.02)
    elif classname.find('BatchNorm') != -1:
        nn.init.normal_(m.weight.data, 1.0, 0.02)
        nn.init.constant_(m.bias.data, 0)

I don't understand line 2 classname = m.__class__.__name__ and line 3 if classname.find('Conv') != -1: from above method weights_init.

Jay Modi · Accepted Answer · 2019-12-14 13:36:57Z

3

To answer your title question, Python's language reference standard types documentation explains it best.

My class Hero is basically user defined callable type and it has special attribute __name__. These attributes are writable and I can modify it as well.

Python String's .find() method quote from official doc:

Return the lowest index in the string where substring sub is found within the slice s[start:end]. Optional arguments start and end are interpreted as in slice notation. Return -1 if sub is not found.

Basically, your sample code is trying to find Conv in the class name and proceed further accordingly.

answered Dec 14, 2019 at 13:36

Jay Modi

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