[scikit-learn] KNeighborsClassifier and metric='precomputed'

[Pedro Pazzini]

Hi all!

I'm trying to use a KNeighborsClassifier with precomputed metric. In it's
predict method (http://scikit-learn.org/stable/modules/generated/sklearn
.neighbors.KNeighborsClassifier.html#sklearn.neighbors.KNeighborsClassifier.predict)
it says the input should be:

"(n_query, n_indexed) if metric == ‘precomputed’"

What is n_indexed?

Shouldn't the shape of the input in the predict method be (n_query,n_query)?

How can I use the predict method after fitting the classifier with a
distance matrix?

Regards,
Pedro Pazzini
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