code: def forward(self, input1, input2):
      output1 = self.forward_once(input1)
      output2 = self.forward_once(input2)
      return output1, output2
  
imports: import torch
  import torch.nn
  import torch.nn.functional
  import torchvision
  from torch.autograd import Variable
  from tensorboardX import SummaryWriter
  import pytest
label_desc: Use image node_id 3 for calling the SiameseNetwork obj's underlying member method code with example usage: obj.forward(input1, input2) and returns: output1,  output2