code: def masks():
      return MaskArray(np.ones((2, 4, 4), dtype=np.uint8))
  
file_path: icevision/tests/models/mmdet/test_dataloaders.py
imports: import pytest
  from icevision.all import *
label_desc: Use image node_id 4 for calling a global function with example usage: masks() and returns: MaskArray