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Fix: make y optional in ignore_background #8647

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Fix: make y optional in ignore_background #8647

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74ce60d
Fix: make y optional in ignore_background
Kirscher Nov 30, 2025
9360ec1
Merge branch 'dev' into fix/ignore-background-optional-y
ericspod Mar 1, 2026
5c3f448
Apply suggestion from @Copilot
ericspod Mar 1, 2026
e674ec1
Merge branch 'dev' into fix/ignore-background-optional-y
ericspod Mar 29, 2026
47c4666
Merge branch 'dev' into fix/ignore-background-optional-y
ericspod Apr 14, 2026
e959caf
Merge branch 'dev' into fix/ignore-background-optional-y
ericspod Apr 29, 2026
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4 changes: 1 addition & 3 deletions monai/metrics/active_learning_metrics.py
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Original file line number Diff line number Diff line change
Expand Up @@ -129,9 +129,7 @@ def compute_variance(
y_pred = y_pred.float()

if not include_background:
y = y_pred
# TODO If this utils is made to be optional for 'y' it would be nice
y_pred, y = ignore_background(y_pred=y_pred, y=y)
y_pred, _ = ignore_background(y_pred=y_pred)

# Set any values below 0 to threshold
y_pred[y_pred <= 0] = threshold
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7 changes: 5 additions & 2 deletions monai/metrics/utils.py
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Expand Up @@ -51,7 +51,9 @@
]


def ignore_background(y_pred: NdarrayTensor, y: NdarrayTensor) -> tuple[NdarrayTensor, NdarrayTensor]:
def ignore_background(
y_pred: NdarrayTensor, y: NdarrayTensor | None = None
) -> tuple[NdarrayTensor, NdarrayTensor | None]:
Comment on lines +54 to +56
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Copilot AI Mar 1, 2026

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The updated type signature makes y optional, but it also changes the return type for all callers to tuple[NdarrayTensor, NdarrayTensor | None]. This will propagate Optional[...] into existing call sites that always pass y (many metrics do), and is likely to fail the repo’s mypy checks. Consider using @overload so that when y is provided the return type remains tuple[NdarrayTensor, NdarrayTensor], and only returns None in the second position when y is omitted/None.

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@ericspod ericspod Mar 1, 2026

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Hi @Kirscher we are seeing this issue in the mypy tests now, please look at what was said here to see how to resolve it. There are other uses of ignore_background you can update to remove the unneeded y=y argument.

"""
This function is used to remove background (the first channel) for `y_pred` and `y`.

Expand All @@ -63,7 +65,8 @@ def ignore_background(y_pred: NdarrayTensor, y: NdarrayTensor) -> tuple[NdarrayT

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ignore_background now allows y=None, but the docstring still describes y as a required ground truth tensor. Please update the docstring to reflect that y is optional and clarify what is returned when y is None (e.g., second tuple element is None).

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"""

y = y[:, 1:] if y.shape[1] > 1 else y # type: ignore[assignment]
if y is not None:
y = y[:, 1:] if y.shape[1] > 1 else y # type: ignore[assignment]
y_pred = y_pred[:, 1:] if y_pred.shape[1] > 1 else y_pred # type: ignore[assignment]
return y_pred, y

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