AttributeError: module 'torch.nn' has no attribute 'Conv2dTranspose'

This error occurs when you try to use the Conv2dTranspose module in PyTorch but it is not available in the nn module. This module was introduced in PyTorch version 0.4.0, so if you are using an older version of PyTorch, you may encounter this error.

To solve this error, you can do one of the following:

1. Upgrade your PyTorch version to 0.4.0 or later.
2. Use the functional interface for ConvTranspose2d instead of the nn module. The functional interface can be accessed using the torch.nn.functional module.

For example, instead of using nn.Conv2dTranspose, you can use F.conv_transpose2d:

import torch
import torch.nn.functional as F

x = torch.randn(1, 16, 32, 32) # input tensor
conv_transpose = F.conv_transpose2d(x, 8, kernel_size=3, stride=2, padding=1)

This should solve the AttributeError.