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Fix type hint for image reader #8646

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Fix type hint for image reader #8646

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bf06a4f
Fix type hint for image reader
Kirscher Nov 30, 2025
1a58715
Merge branch 'dev' into fix/image-reader-type-hint
ericspod Dec 1, 2025
338ef11
Merge branch 'dev' into fix/image-reader-type-hint
ericspod Dec 5, 2025
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Fix type hint for image reader 
Signed-off-by: Tristan Kirscher <85068746+Kirscher@users.noreply.github.com>
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@Kirscher
Kirscher committed Nov 30, 2025
commit bf06a4f0081b77588dda2624a751da46c4ea3b6d
19 changes: 10 additions & 9 deletions 19 monai/data/image_reader.py
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Expand Up @@ -22,7 +22,7 @@
from collections.abc import Callable, Iterable, Iterator, Sequence
from dataclasses import dataclass
from pathlib import Path
from typing import TYPE_CHECKING, Any
from typing import TYPE_CHECKING, Any, Union

import numpy as np
from torch.utils.data._utils.collate import np_str_obj_array_pattern
Expand Down Expand Up @@ -57,6 +57,13 @@
cp, has_cp = optional_import("cupy")
kvikio, has_kvikio = optional_import("kvikio")

if TYPE_CHECKING:
import cupy

NdarrayOrCupy = Union[np.ndarray, cupy.ndarray]
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@ericspod ericspod Dec 1, 2025

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This was done to get around Cupy being an optional dependency, this makes it necessary when type checking but this might not be avoidable right now. We do need to consider a way of defining placeholder types for optional dependencies so we can type check correctly without these workarounds.

else:
NdarrayOrCupy = Any

__all__ = ["ImageReader", "ITKReader", "NibabelReader", "NumpyReader", "PILReader", "PydicomReader", "NrrdReader"]


Expand Down Expand Up @@ -663,10 +670,7 @@ def get_data(self, data) -> tuple[np.ndarray, dict]:
metadata[MetaKeys.SPATIAL_SHAPE] = data_array.shape
dicom_data.append((data_array, metadata))

# TODO: the actual type is list[np.ndarray | cp.ndarray]
# should figure out how to define correct types without having cupy not found error
# https://github.com/Project-MONAI/MONAI/pull/8188#discussion_r1886645918
img_array: list[np.ndarray] = []
img_array: list[NdarrayOrCupy] = []
compatible_meta: dict = {}

for data_array, metadata in ensure_tuple(dicom_data):
Expand Down Expand Up @@ -1104,10 +1108,7 @@ def get_data(self, img) -> tuple[np.ndarray, dict]:
img: a Nibabel image object loaded from an image file or a list of Nibabel image objects.

"""
# TODO: the actual type is list[np.ndarray | cp.ndarray]
# should figure out how to define correct types without having cupy not found error
# https://github.com/Project-MONAI/MONAI/pull/8188#discussion_r1886645918
img_array: list[np.ndarray] = []
img_array: list[NdarrayOrCupy] = []
compatible_meta: dict = {}

for i, filename in zip(ensure_tuple(img), self.filenames):
Expand Down
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