code: def forward(self, x):
      stem_1_out = self.stem_1(x)
  
      stem_2a_out = self.stem_2a(stem_1_out)
      stem_2b_out = self.stem_2b(stem_2a_out)
  
      stem_2p_out = self.stem_2p(stem_1_out)
  
      out = self.stem_3(torch.cat((stem_2b_out, stem_2p_out), 1))
      return out, stem_1_out
  
imports: from __future__ import absolute_import, division, print_function
  import torch
  import torch.nn
  import torch.nn.functional
label_desc: Use image node_id 2 for calling the StemBlock obj's underlying member method code with example usage: obj.forward(x) and returns: out,  stem_1_out