class_docstr: Identity layer
  The output of this layer is the input without any change.
  Use this layer to avoid using 'if' condition in forward methods
code: def forward(self, x):
      return x
  
imports: import copy
  import paddle
  import paddle.nn
  from disco_diffusion_ernievil_base.vit_b_16x.ernievil2.transformers.droppath import DropPath
label_desc: Use image node_id 2 for calling the Identity obj's underlying member method code with example usage: obj.forward(x) and returns: x