Ensure location as tuple in wsireader (#8007)

Fixes #8006

### Description

Ensure location as tuple in wsireader

### Types of changes
<!--- Put an `x` in all the boxes that apply, and remove the not
applicable items -->
- [x] Non-breaking change (fix or new feature that would not break
existing functionality).
- [ ] Breaking change (fix or new feature that would cause existing
functionality to change).
- [ ] New tests added to cover the changes.
- [ ] Integration tests passed locally by running `./runtests.sh -f -u
--net --coverage`.
- [x] Quick tests passed locally by running `./runtests.sh --quick
--unittests --disttests`.
- [ ] In-line docstrings updated.
- [ ] Documentation updated, tested `make html` command in the `docs/`
folder.

Signed-off-by: YunLiu <[email protected]>

monai/data/wsi_datasets.py

@@ -23,7 +23,7 @@
 from monai.data.utils import iter_patch_position
 from monai.data.wsi_reader import BaseWSIReader, WSIReader
 from monai.transforms import ForegroundMask, Randomizable, apply_transform
-from monai.utils import convert_to_dst_type, ensure_tuple_rep
+from monai.utils import convert_to_dst_type, ensure_tuple, ensure_tuple_rep
 from monai.utils.enums import CommonKeys, ProbMapKeys, WSIPatchKeys
 
 __all__ = ["PatchWSIDataset", "SlidingPatchWSIDataset", "MaskedPatchWSIDataset"]
@@ -123,9 +123,9 @@ def _get_label(self, sample: dict):
     def _get_location(self, sample: dict):
         if self.center_location:
             size = self._get_size(sample)
-            return [sample[WSIPatchKeys.LOCATION][i] - size[i] // 2 for i in range(len(size))]
+            return ensure_tuple(sample[WSIPatchKeys.LOCATION][i] - size[i] // 2 for i in range(len(size)))
         else:
-            return sample[WSIPatchKeys.LOCATION]
+            return ensure_tuple(sample[WSIPatchKeys.LOCATION])
 
     def _get_level(self, sample: dict):
         if self.patch_level is None: