MLlib: how to get the best model with only the most significant explanatory variables in LogisticRegressionWithLBFGS or LogisticRegressionWithSGD ?

I am new in MLlib and in Spark.(I use Scala) I'm trying to understand how LogisticRegressionWithLBFGS and LogisticRegressionWithSGD work. I usually use R to do logistic regressions but now I do it on Spark to be able to analyze Big Data. The model only returns weights and intercept. My problem is

How to get the best performance with LogisticRegressionWithSGD?

I'm new to Spark and I'm getting bad performance with classification methods on Spark MLlib (worse than R in terms of AUC). I am trying to put my own parameters rather than the default parameters. Here is the method I want to use : train(RDD input, int numIterations, doub

Re: How to get the best performance with LogisticRegressionWithSGD?

I've tried several different couple of parameters for my LogisticRegressionWithSGD and here are my results. My numIterations varies from 100 to 500 by 50 and my stepSize varies from 0.1 to 1 by 0.1. My last line represents the maximum of each column and my last column the maximum of each line and w

How to read a Json file with a specific format?

I'm trying to read a Json file which is like : [ {"IFAM":"EQR","KTM":143000640,"COL":21,"DATA":[{"MLrate":"30","Nrout":"0","up":null,"Crate":"2"} ,{"MLrate":"30","Nrout":"0","up":null,"Crate":"2"} ,{"MLrate":"30","Nrout":"0","up":null,"Crate":"2"} ,{"MLrate":"30","Nrout":"0","up":null,"Crate":"

How to perform basic statistics on a Json file to explore my numeric and non-numeric variables?

I've imported a Json file which has this schema : sqlContext.read.json("filename").printSchema root |-- COL: long (nullable = true) |-- DATA: array (nullable = true) ||-- element: struct (containsNull = true) |||-- Crate: string (nullable = true)