scala - How is logistic regression parallelized in Spark? -


i wouldlike have insight method used parallelize logistic regression in ml library, tried check source code didn't understand process.

spark uses called mini batch gradient descent regression:

http://ruder.io/optimizing-gradient-descent/index.html#minibatchgradientdescent

in nutshell, works this:

  1. select sample of data
  2. compute gradient on each row of sample
  3. aggregate gradient
  4. back step 1

the actual optimisation code spark line: https://github.com/apache/spark/blob/master/mllib/src/main/scala/org/apache/spark/mllib/optimization/gradientdescent.scala#l234


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