code: def forward(self, x):
      for block, shortcut in zip(self.blocks, self.shortcuts):
          x = shortcut(x) + block(x)
      return x
  
imports: from torch import nn
  from torch.nn.utils import weight_norm
label_desc: Use image node_id 2 for calling the ResidualStack obj's underlying member method code with example usage: obj.forward(x) and returns: x