replace view with reshape for robustness (#5690)

#5684 (comment)
Signed-off-by: Joeycho <joeyadamcho@gmail.com>

Fixes #5684

### 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`.
- [ ] 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: Joeycho <joeyadamcho@gmail.com>

Author: Joeycho

monai/metrics/confusion_matrix.py

@@ -163,8 +163,8 @@ def get_confusion_matrix(y_pred: torch.Tensor, y: torch.Tensor, include_backgrou
     batch_size, n_class = y_pred.shape[:2]
     # convert to [BNS], where S is the number of pixels for one sample.
     # As for classification tasks, S equals to 1.
-    y_pred = y_pred.view(batch_size, n_class, -1)
-    y = y.view(batch_size, n_class, -1)
+    y_pred = y_pred.reshape(batch_size, n_class, -1)
+    y = y.reshape(batch_size, n_class, -1)
     tp = ((y_pred + y) == 2).float()
     tn = ((y_pred + y) == 0).float()