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https://issues.apache.org/jira/browse/SPARK-20203?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15953297#comment-15953297
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Cyril de Vogelaere commented on SPARK-20203:
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SPARK-20180 was about adding a special value (0) to find all pattern no matter
their length, and put it as default value.
You pointed it might lower the performances, without adding more
functionalities. So I closed that thread.
This one is just about changing the default value, no other changes in the code.
You said it needed discussion, since it was a change in default behavior. But
the amount of comment on the last thread would discourage discussion, I felt
like a new thread would be more appropriate.
> Change default maxPatternLength value to Int.MaxValue in PrefixSpan
> -------------------------------------------------------------------
>
> Key: SPARK-20203
> URL: https://issues.apache.org/jira/browse/SPARK-20203
> Project: Spark
> Issue Type: Wish
> Components: MLlib
> Affects Versions: 2.1.0
> Reporter: Cyril de Vogelaere
> Priority: Trivial
> Original Estimate: 0h
> Remaining Estimate: 0h
>
> I think changing the default value to Int.MaxValue would be more user
> friendly. At least for new users.
> Personally, when I run an algorithm, I expect it to find all solution by
> default. And a limited number of them, when I set the parameters to do so.
> The current implementation limit the length of solution patterns to 10.
> Thus preventing all solution to be printed when running slightly large
> datasets.
> I feel like that should be changed, but since this would change the default
> behavior of PrefixSpan. I think asking for the communities opinion should
> come first. So, what do you think ?
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