code: def expected_n_subjects() -> int:
      return 2
  
file_path: brainiak/tests/io/test_io.py
imports: from pathlib import Path
  from typing import Iterable, Sequence
  import nibabel
  import numpy
  import pytest
  from brainiak import io
label_desc: Use image node_id 6 for calling a global function with example usage: expected_n_subjects() and returns: int