Anomaly detection based on K-Nearest Neighbor (KNN)

install by mrbgems

add conf.gem line to build_config.rb

MRuby::Build.new do |conf|
    # ... (snip) ...
    conf.gem :github => 'tsurubee/mruby-knn-detector'
end

example

$ mruby/bin/mirb
mirb - Embeddable Interactive Ruby Shell
> knn = KNN.new(2, 1)  #(Window size, Number of neighbors)
 => #<KNN:0xdc0fa0 @k=1, @w=2>
> data = [1, 2, 10, 2, 1]
 => [1, 2, 10, 2, 1]
> knn.score(data)
 => [0, 1.4142135623731, 8.0622577482985, 8.0622577482985, 1.4142135623731]

The input 'data' must be one-dimensional array-like object containing a sequence of values.
The output is Array with the same size as input data.

License

under the MIT License:

see LICENSE file