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Raise OptionalImportError when user-specified reader is not installed #9039

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Raise OptionalImportError when user-specified reader is not installed #9039

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aedd0bb
Raise OptionalImportError when user-specified reader is not installed…
vandhanaanatarajan-oss Aug 1, 2026
a476a63
Address CodeRabbit feedback: add Raises docstring and check exception…
vandhanaanatarajan-oss Aug 1, 2026
f3bd473
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Aug 1, 2026
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6 changes: 3 additions & 3 deletions monai/transforms/io/array.py
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Original file line number Diff line number Diff line change
Expand Up @@ -209,10 +209,10 @@ def __init__(
the_reader = look_up_option(_r.lower(), SUPPORTED_READERS)
try:
self.register(the_reader(*args, **kwargs))
except OptionalImportError:
warnings.warn(
except OptionalImportError as e:
raise OptionalImportError(
f"required package for reader {_r} is not installed, or the version doesn't match requirement."
)
) from e
except TypeError: # the reader doesn't have the corresponding args/kwargs
warnings.warn(f"{_r} is not supported with the given parameters {args} {kwargs}.")
self.register(the_reader())
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11 changes: 8 additions & 3 deletions tests/transforms/test_load_image.py
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Expand Up @@ -221,9 +221,14 @@ def test_nibabel_reader(self, input_param, filenames, expected_shape):
assert_allclose(result.affine, torch.eye(4))
self.assertTupleEqual(result.shape, expected_shape)

@SkipIfNoModule("nibabel")
@SkipIfNoModule("cupy")
@SkipIfNoModule("kvikio")

def test_reader_not_installed_raises(self):
from unittest.mock import patch
from monai.utils import OptionalImportError

with patch("monai.data.ITKReader", side_effect=OptionalImportError("itk not installed")):
with self.assertRaises(OptionalImportError):
LoadImage(reader="ITKReader")
@parameterized.expand([TEST_CASE_GPU_1, TEST_CASE_GPU_2, TEST_CASE_GPU_3, TEST_CASE_GPU_4])
def test_nibabel_reader_gpu(self, input_param, filenames, expected_shape):
if torch.__version__.endswith("nv24.8"):
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