Top 50 Apache Spark Interview Questions & Answers by Knowledge Powerhouse

Author:Knowledge Powerhouse [Powerhouse, Knowledge]
Language: eng
Format: epub
Published: 2017-03-17T07:00:00+00:00

23. What are the two main types of Vector in Spark?

There are two main types of Vector in Spark:

Dense Vector: A dense vector is backed by an array of double data type. This array contains the values.

E.g. {1.0 , 0.0, 3.0}

Sparse Vector: A sparse vector is backed by two parallel arrays. One array is for indices and the other array is for values.

E.g. {3, [0,2], [1.0,3.0]}

In this array, the first element is the number of elements in vector. Second element is the array of indices of non-zero values. Third element is the array of non-zero values.

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