(1) When I try to use it with a sparse matrix I get (for a binary problem):
--> 585 proba = np.ones((len(X), 2), dtype=np.float64)
--> 175 raise TypeError("sparse matrix length is ambiguous;
use getnnz()"
176 " or shape[0]")
(2) When I try to use it for a multiclass problem, it's not
implemented, but I'd like to know if it's doable, or if there's a
particular reason (i.e. theoretical) why it isn't.
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