code: def pick(self, lhs: T, rhs: T) -> T:
      if self is Side.LHS:
          return lhs
      elif self is Side.RHS:
          return rhs
      else:
          raise NotImplementedError("Unknown side: %s" % self)
  
file_path: PyTorch-BigGraph/torchbiggraph/types.py
imports: from enum import Enum
  from typing import Any, Dict, NamedTuple, TypeVar
  import torch
label_desc: Use image node_id 1 for calling the Side obj's underlying member method code with example usage: obj.pick(lhs, rhs) and returns: lhs, rhs