code: def df_with_users_interacting_only_once():
      return pd.DataFrame(
          data={
              "userId": [0, 1, 1, 2, 2, 2, 3, 3, 3, 4, 0, 5],
              "itemId": [1, 2, 3, 4, 5, 6, 7, 8, 9, 1, 2, 3],
          }
      )
  
file_path: collie/tests/fixtures/utils_fixtures.py
imports: import numpy
  import pandas
  import pytest
  import torch
label_desc: Use image node_id 4 for calling a global function with example usage: df_with_users_interacting_only_once() and returns: pd