code: def forward(self, x):
      x = self.block(x)
      return x
  
imports: import torch
  import torch.nn
  import torch.nn.functional
  from pywick.models.segmentation.da_basenets.resnet import resnet18
label_desc: Use image node_id 2 for calling the _BiSeHead obj's underlying member method code with example usage: obj.forward(x) and returns: x