Let's start coding now. We start from the very beginning, that is, by importing libraries and packages:

package com.packt.ScalaML.HAR 

import ml.dmlc.mxnet.Context 
import LSTMNetworkConstructor.LSTMModel 
import scala.collection.mutable.ArrayBuffer 
import ml.dmlc.mxnet.optimizer.Adam 
import ml.dmlc.mxnet.NDArray 
import ml.dmlc.mxnet.optimizer.RMSProp 
import org.sameersingh.scalaplot.MemXYSeries 
import org.sameersingh.scalaplot.XYData 
import org.sameersingh.scalaplot.XYChart 
import org.sameersingh.scalaplot.Style._ 
import org.sameersingh.scalaplot.gnuplot.GnuplotPlotter 
import org.sameersingh.scalaplot.jfreegraph.JFGraphPlotter