code: def _insert_return(fn):
      return _insert_op(fn=fn, op="return", name="return")
  
file_path: coremltools/coremltools/converters/mil/frontend/tensorflow2/tf_graph_pass/rewrite_control_flow_functions.py
imports: from coremltools import _logger
  from coremltools.converters.mil.frontend.tensorflow.basic_graph_ops import connect_edge, connect_edge_at_index, delete_node, disconnect_edge, replace_dest, replace_node
  from coremltools.converters.mil.frontend.tensorflow.parsed_tf_node import ParsedTFNode
label_desc: Use image node_id 5 for calling a global function with example usage: _insert_return(fn) and returns: _insert_op