code: def _identity(x):
      return x
  
file_path: mne-python/mne/utils/tests/test_progressbar.py
imports: from pathlib import Path
  import numpy
  import pytest
  from numpy.testing import assert_array_equal
  from mne.parallel import parallel_func
  from mne.utils import ProgressBar, array_split_idx, catch_logging, use_log_level
label_desc: Use image node_id 2 for calling a global function with example usage: _identity(x) and returns: x