[scikit-learn] Affinity Propagation is the best algo for without choosing the number of cluster?

[lampahome]

I search for clustering algo to cluster into groups without considering
about number of groups.

I found AP algo which needn't choose the number of clusters.

In my experiments, AP cluster well without choosing any parameters.

But I'm not sure any corner case which will caused clustering worse.

Does anyone try AP and found some side-effect? or the way to tune
parameters?

thx
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