(dbscan) Use valid index for neighbors #100
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The DBSCAN implementation was producing garbage results for me because the
_get_neighborsfunction was returning the wrong indices for valid neighbors.If comparing a sample with higher index than the argument, the returned indices were off by 1.
This change fixes it.
PS thanks for this implementation! It's a better fit for my use-case, where speed is not important but avoiding
scipyis very convenient.