Huber loss Convergence

 for (size <- Seq(1, 4, 16, 64); iter <- Seq(10, 50, 100)) {
    Thread.sleep(10000)
    val hlir = new LinearRegression().setLoss("huber").setSolver("l-bfgs").setMaxIter(iter).setTol(0)
    val start = System.currentTimeMillis
    val model = hlir.setBlockSize(size).fit(df)
    val end = System.currentTimeMillis
    println((model.uid, size, iter, end - start, model.summary.objectiveHistory.last, model.summary.totalIterations, model.coefficients.toString.take(100)))
}