Unknown Python syntax in PyTorch: a instance can directly receive a parameter

Question

I have a question about Python syntax when I'm learning PyTorch. The following codes are an example from the PyTorch document.

m = nn.Linear(20, 30)
input = autograd.Variable(torch.randn(128, 20))
output = m(input)
print(output.size())

This first line is to create an instance m, but why this instance m can directly receive a parameter like the line 3? I think it should use method to deal with parameter like m.method(input).

excalibur1491 · Accepted Answer · 2018-01-02 05:01:57Z

2

In python, any object can define a __call__ method that allows it to be used as a function like in your example.

Reference: https://docs.python.org/2/reference/datamodel.html#object.call

answered Jan 2, 2018 at 5:01

excalibur1491

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2 Comments

Zhi Jiang Over a year ago

Thank you so much. I am not very familiar with Python, so I didn't know it before.

excalibur1491 Over a year ago

Glad I could help

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