class_docstr: Maps an opcode index to an op name.
code: def __call__(self, x):
      if x not in self.code_to_name:
          s = "<UNKNOWN>"
      else:
          s = self.code_to_name[x]
      return "%s (%d)" % (s, x)
  
imports: import json
  import os
  import re
  import sys
  import numpy
label_desc: Use image node_id 2 for calling the OpCodeMapper obj's underlying member method code with example usage: obj.__call__(x) and returns: unknown