update_many for metrics

[kulbachcedric]

Hi,

we could add a update_many(y,y_pred) method for the metrics.
It could be helpful with the predict_proba_many and learn_many methods.

What do you think?

Cedric

[MaxHalford]

Yes that's a reasonable ask. I'll think about it! It might have a few implications. In the meantime I'll add a card to the roadmap.