code: def GroupByteSize(field_number, message):
      return (
          2 * TagByteSize(field_number)  # START and END group.
          + message.ByteSize()
      )
  
imports: import struct
  from google.protobuf import descriptor
  from google.protobuf import message
label_desc: Use image node_id 22 for calling a global function with example usage: GroupByteSize(field_number, message) and returns: unknown