class_docstr: a layer to replace bn or relu layers
code: def forward(self, input):
      return input
  
file_path: PaddleDetection/ppdet/utils/fuse_utils.py
imports: import copy
  import paddle
  import paddle.nn
label_desc: Use image node_id 2 for calling the Identity obj's underlying member method code with example usage: obj.forward(input) and returns: input