code: def add_one(i):  # picklable for multiprocessing
      return i + 1
  
imports: import pytest
  from datasets.parallel import ParallelBackendConfig, parallel_backend
  from datasets.utils.py_utils import map_nested
  from .utils import require_dill_gt_0_3_2, require_joblibspark, require_not_windows
label_desc: Use image node_id 1 for calling a global function with example usage: add_one(i) and returns: unknown