class_docstr: Helper class for building a 2D unet.
class_docstr_tok: ["Helper","class","for","building","a","2D","unet","."]
code: def forward(self, x):
      forward_passed = self.model(x)
      return torch.cat([x, forward_passed], 1)
  
imports: import torch
  import torch.nn
  import torchvision.utils
  from torch.nn import functional
label_desc: Use image node_id 2 for calling the UnetSkipConnectionBlock obj's underlying member method code with example usage: obj.forward(x) and returns: torch