`reduction` for `ContrastiveLoss`

[wyli]

Describe the bug
the error messages and docstring should be consistent

MONAI/monai/losses/contrastive.py

Lines 89 to 91 in a7bc4a3

	if self.reduction == LossReduction.SUM.value:
	return torch.sum(loss_partial) / (2 * self.batch_size)
	raise ValueError(f"Unsupported reduction: {self.reduction}, " f'available options are ["mean", "sum", "none"].')

MONAI/monai/losses/contrastive.py

Line 58 in a7bc4a3

ValueError: When ``self.reduction`` is not one of ["sum", "none"].

Expected behavior
implementing the option reduction="none"?

[wyli]

Hi @finalelement, could you please help look into this one?

[finalelement]

Sure thing, will get back soon.

[wyli]

discussed with @finalelement that I'll deprecate the reduction option