`ValueError: Out of options!` when passing `surr_loss='hinge'` to `PairwiseAUCLoss`

[AmanKashyap0807]

passing surr_loss="hinge" to PairwiseAUCLoss results in a ValueError: Out of options!.
Looking at libauc/losses/surrogate.py inside the get_surrogate_loss dispatcher, there is no elif statement for 'hinge', so it falls through to the else block and crashes.

Environment:
LibAUC Version: 2.0.0
PyTorch Version: 2.3.1

[PenGuln]

Thanks for the report! hinge_loss was defined and listed in __all__ but accidentally omitted from the get_surrogate_loss dispatcher, so it passed the assert check but hit the ValueError. Fixed in surrogate.py#L85-L86

[AmanKashyap0807]

@PenGuln Thank you so much for correcting f_ns and f_ps, you can also correct it from documentation on https://docs.libauc.org/_modules/libauc/losses/auc.html#PairwiseAUCLoss

[PenGuln]

Thanks for the heads-up — the documentation has been updated as well. Please let us know if you run into any further issues!