code: def IsMerge(op):
      """Return true if `op` is a Merge."""
      return op.type == "Merge" or op.type == "RefMerge"
  
imports: import os
  import traceback
  from tensorflow.python import tf2
  from tensorflow.python.platform import tf_logging
label_desc: Use image node_id 9 for calling a global function with example usage: IsMerge(op) and returns: unknown