scripts/builtin/abstain.dml

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m_abstain = function(Matrix[Double] X, Matrix[Double] Y, Double threshold, Boolean verbose = FALSE)
return (Matrix[Double] abstain)
{

  # for(i in 1:100) {
  betas = multiLogReg(X=X, Y=Y, icpt=2, tol=1e-9, reg=0.0001, maxi=100, maxii=0, verbose=FALSE)
  [prob, yhat, accuracy] = multiLogRegPredict(X, betas, Y, FALSE)
  abstain = cbind(X, Y)
  inc = ((yhat != Y) & (rowMaxs(prob) < threshold))

  if(sum(inc) > 0)
  {
    # print("inc vector "+toString(inc))
    abstain = removeEmpty(target = cbind(X, Y), margin = "rows", select = (inc == 0) )
  }

}