WIP: Updated tested metric support for Hamerly

Author: PyDataBlog

src/hamerly.jl

@@ -150,7 +150,7 @@ function update_containers(::Hamerly, containers, centroids, n_threads, metric)
     @inbounds for i in axes(centroids, 2)
         for j in i+1:size(centroids, 2)
             d = distance(metric, centroids, centroids, i, j)
-            d = T(0.25)*d
+            d = T(centers_coefficient(metric)) * d
             s[i] = s[i] > d ? d : s[i]
             s[j] = s[j] > d ? d : s[j]
         end

src/kmeans.jl

@@ -199,3 +199,7 @@ function collect_containers(::AbstractKMeansAlg, containers, n_threads)
         @inbounds containers.centroids_new[end] .= containers.centroids_new[end] ./ containers.centroids_cnt[end]'
     end
 end
+
+# Special center co-efficent dispatched on Euclidean or different metrics supported by Distances.jl
+centers_coefficient(::Euclidean) = 0.25
+centers_coefficient(::Distances.Metric) = 0.5