class_docstr: This head returns the input without changing it. This can
  be attached to a model, if the output of the model is the
  desired result.
class_docstr_tok: ["This","head","returns","the","input","without","changing","it",".","This","can","be","attached","to","a","model",",","if","the","output","of","the","model","is","the","desired","result","."]
code: def forward(self, x):
      return x
  
imports: from typing import Any, Dict
  from classy_vision.heads import ClassyHead, register_head
label_desc: Use image node_id 1 for calling the IdentityHead obj's underlying member method code with example usage: obj.forward(x) and returns: x