scripts/builtin/kmeansPredict.dml

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# Builtin function that does predictions based on a set of centroids provided.
#
# INPUT PARAMETERS:
# ----------------------------------------------------------------------------
# NAME     TYPE      DEFAULT  MEANING
# ----------------------------------------------------------------------------
# X        Double    ---      The input Matrix to do KMeans on.
# C        Double    ---      The input Centroids to map X onto.
#
# RETURN VALUES
# ----------------------------------------------------------------------------
# NAME     TYPE      DEFAULT  MEANING
# ----------------------------------------------------------------------------
# Y        String    "Y.mtx"  The mapping of records to centroids
# ----------------------------------------------------------------------------


m_kmeansPredict = function(Matrix[Double] X, Matrix[Double] C)
  return (Matrix[Double] Y)
{
 
    D =  -2 * (X %*% t(C)) + t(rowSums (C ^ 2));
    P = (D <= rowMins (D));
    aggr_P = t(cumsum (t(P)));
    Y = rowSums (aggr_P == 0) + 1

}