INNER CODE UNIT · Ruby

dif_vec

yoshoku/rumale · rumale-core/lib/rumale/dataset.rb:150

          dif_vec = centers.max(0) - min_vec
          dif_vec[dif_vec.eq(0)] = 1.0
          centers = ((centers - min_vec.tile(n_centers,
                                             1)) / dif_vec.tile(n_centers, 1)) * (center_max - center_min) + center_min
        end
        # generate blobs.
        sz_cluster = [n_samples / n_centers] * n_centers
        (n_samples % n_centers).times { |n| sz_cluster[n] += 1 }
        x = ::Rumale::Utils.rand_normal([sz_cluster[0], n_features], rng, 0.0, cluster_std) + centers[0, true]
        y = Numo::Int32.zeros(sz_cluster[0])
        (1...n_centers).each do |n|
          c = ::Rumale::Utils.rand_normal([sz_cluster[n], n_features], rng, 0.0, cluster_std) + centers[n, true]
          x = Numo::DFloat.vstack([x, c])
          y = y.concatenate(Numo::Int32.zeros(sz_cluster[n]) + n)
        end
        # shuffle data.
        if shuffle
          rand_ids = Array(0...n_samples).shuffle(random: rng.dup)

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