code: def extract_slot_name(slot):
      """
      Two valid slots under IOB scheme are B-Slot_Name / I-Slot_Name
      This function returns the Slot_Name
      """
      if is_valid_slot(slot):
          return slot[2:]
      else:
          raise Exception("Invalid slot")
  
file_path: pytext/demo/atis_joint_model/data_processor.py
imports: import os
  import random
  import click
  from pytext.utils.file_io import PathManager
label_desc: Use image node_id 3 for calling a global function with example usage: extract_slot_name(slot) and returns: slot