TypeError: 'NoneType' object is not callable

[amirid]

Hi,
I want to port z = nn.Sampler():forward({mean, log_var}) from torch to the following in python:

sampler = nn.Sampler()
z = sampler._forward(mean, log_var)

and I get the following error:

sampler = nn.Sampler()
TypeError: 'NoneType' object is not callable

How can I solve it?