code: def forward(self, x_children: List[torch.Tensor]):
      x = self.conv(torch.cat(x_children, 1))
      x = self.bn(x)
      if self.shortcut:
          x += x_children[0]
      x = self.relu(x)
  
      return x
  
imports: import math
  from typing import List, Optional
  import torch
  import torch.nn
  import torch.nn.functional
  from timm.data import IMAGENET_DEFAULT_MEAN, IMAGENET_DEFAULT_STD
  from timm.layers import create_classifier
  from ._builder import build_model_with_cfg
  from ._registry import register_model, generate_default_cfgs
label_desc: Use image node_id 2 for calling the DlaRoot obj's underlying member method code with example usage: obj.forward(x_children) and returns: x