code: def identity(x):
      # simple transform that returns the input itself
      return x
  
file_path: MONAI/tests/test_patch_dataset.py
imports: from __future__ import annotations
  import sys
  import unittest
  import numpy
  from monai.data import DataLoader, Dataset, PatchDataset
  from monai.transforms import RandShiftIntensity, RandSpatialCropSamples
  from monai.utils import set_determinism
label_desc: Use image node_id 1 for calling a global function with example usage: identity(x) and returns: x