code: def header():
      header = {
          "col_user": "UserId",
          "col_item": "MovieId",
          "col_rating": "Rating",
          "col_timestamp": "Timestamp",
      }
      return header
  
file_path: recommenders/contrib/sarplus/python/tests/conftest.py
imports: import calendar
  import datetime
  import pandas
  import pytest
  from sklearn.model_selection import train_test_split
label_desc: Use image node_id 2 for calling a global function with example usage: header() and returns: header