code: def forward(self, a, b):
      b = self.conv1(b)
      a = self.conv2(a)
      if self.upscale:
          b = F.interpolate(
              b, scale_factor=2.0, mode="bilinear", align_corners=True
          )
      return torch.cat((a, b), dim=1)
  
imports: import os
  import sys
  import torch
  import torch.nn
  import torch.utils.model_zoo
  from torch.nn import functional
label_desc: Use image node_id 2 for calling the BlockTypeA obj's underlying member method code with example usage: obj.forward(a, b) and returns: torch