1. Spark uses a string to represent a vector. For example, (8,[1,4,5],[0.871,1.0,0.447]) is one such string....
1. Spark uses a string to represent a vector. For example, (8,[1,4,5],[0.871,1.0,0.447])
is one such string. Write out the full vector that the above string represents:
2. Very briefly, what is the main advantage of using such a sting representation for a vector?
3.
When using columnSimilarities() call on a RDD, the results coming back is a collection of MatrixEntry instances. One of the instance looks like the following,
MatrixEntry(109,385,0.032109)
very briefly, write out what does this entry mean.
Homework Answers
SOLUTION-
1. In Spark we've many forms of vectors to represent the string in
Given, (8, [1,4,5], [0.871, 1.0, 0.447])
In this It has a size of 8, [1,4,5] represent the indices, the rest represent the values which are non-zero
It means that the vector has
0.871 at 1st position
1.0 at 4th position
0.447 at 5th position
2. It's helpful in computation and storage management. Such a string is used to provide clear reference.
3. Given , MatrixEntry(109,385,0.032109)
The constructor MatrixEntry represents ith row and jth column and it's corresponding value of that entry
109 is row
385 is column
0.032109 is the value/entry
row and column are of type long
value is of type double
Hence this represents to enter that particular value in a matrix which is distributed at ijth position.
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1. Spark uses a string to represent a vector. For example,
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