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Posted to issues@flink.apache.org by ChristophAl <gi...@git.apache.org> on 2015/06/29 10:14:29 UTC

[GitHub] flink pull request: [FLINK-1735] Feature Hasher

Github user ChristophAl commented on the pull request:

    https://github.com/apache/flink/pull/665#issuecomment-116517528
  
    Hi,
    
    after I rebased it on master and implemented the new pipeline interface, I have some followup questions regarding the types we should accept for feature hashing.
    
    I can think of Iterable[String] and Iterable[(String, Int)] for documents as well as (Int, Iterable[String]) and (Int, Iterable[(String, Int)]) for documents having some kind of index. So I'm not sure if it is required to hash arbitrary types by using .hashcode()?
    Also note, in case the nonNegative parameter is set to true, the output can be used as TF in TF-IDF.


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