Cyril de Vogelaere created SPARK-20265:
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Summary: Improve Prefix'span pre-processing efficiency
Key: SPARK-20265
URL: https://issues.apache.org/jira/browse/SPARK-20265
Project: Spark
Issue Type: Improvement
Components: MLlib
Affects Versions: 2.1.0
Reporter: Cyril de Vogelaere
Priority: Minor
Given the sequence :
0 4 0 1 0 2 0 5 0 2 0 4 0 5
And supposing only item 4 and 5 are frequent. The current implementation will
clean the sequence as follow.
0 4 0 0 0 5 0 0 4 0 5
Which, while still giving the same results, inneficiently leave sequences of
zero. A quick change in the code can removes those sequence of zeros, while not
changing the returned solutions.
I ran test to mesure efficiency gain, they are available in the graph below :
http://i67.tinypic.com/29ljswy.jpg
As you can see, the performance increase is signifiant.
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