Apache Spark 2.x Machine Learning Cookbook

How it works...

1. The signature for this method constructor is:

DenseVector (double[] values)

2. The method inherits from the following which makes its concrete methods available to all routines:

interface class java.lang.Objectinterface org.apache.spark.mllib.linalg. Vector

3. There are several method calls that are of interest:
   1. Make a deep copy of the vector:

DenseVector copy()

2. 2. Convert to the SparseVector. You will do this if your vector is long and the density decreases after a number of operations (for example, zero out non-contributing members):

SparseVector toSparse()

3. 3. Find the number of non-zero elements. This is useful so you can convert on-the-fly to the SparseVector if the density ID is low:

Int numNonzeros()

• 4. Convert ...