I've been running a classifier on my data with the 'NearestNeighbors' method. I've learned that I can specify the number of neighbours used with the following command:

 Classify[data, Method -> {"NearestNeighbors", "NeighborsNumber" -> X}]

However, I can't seem to find anywhere how many neighbours the classifier uses when I don't specify the number with the NeighborsNumber option. As a result, I'm not exactly sure what the "default" classifier is doing.

Does anyone have any insight into this? Any help would be much appreciated.



1 Answer 1


It probably picks an appropriate value by some (internal) heuristics. Use Information to get the parameters that were used for a particular case.

c = Classify[{1, 2, 3, 4} -> {1, 1, 2, 2}, Method -> "NearestNeighbors"];

Information[c, "MethodOption"]

(* Method -> {"NearestNeighbors", "NeighborsNumber" -> 1, 
  "DistributionSmoothing" -> 0.5, "NearestMethod" -> "KDtree"} *)
  • $\begingroup$ This works perfectly. I was aware that one could ask for lots of information from the classifying function, but didn't know about the method option in particular. Thanks! $\endgroup$
    – LNah
    Commented Feb 15, 2022 at 23:48

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