#-------------------------------------------------------------
#
# Licensed to the Apache Software Foundation (ASF) under one
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# distributed with this work for additional information
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# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
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# KIND, either express or implied.  See the License for the
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#-------------------------------------------------------------

# Builtin function that does predictions based on a set of centroids provided.
#
# INPUT:
# -----------------------------------------------
# X     The input Matrix to do KMeans on.
# C     The input Centroids to map X onto.
# -----------------------------------------------
#
# OUTPUT:
# ------------------------------------------------------
# Y     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));
  Y = rowIndexMax(P);
}

