code: def _test_preds(preds):
      assert len(preds) == 1
      assert isinstance(preds[0].segmentation.mask_array, MaskArray)
      assert preds[0].segmentation.mask_array.data.squeeze().shape == (
          64,
          64,
      )
      assert preds[0].segmentation.class_map is not None
      assert preds[0].segmentation.class_map.num_classes == 32
  
imports: import pytest
  from icevision.all import *
  from icevision.models.fastai.unet.backbones import *
label_desc: Use image node_id 1 for calling a global function with example usage: _test_preds(preds) without return types