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https://issues.apache.org/jira/browse/FLINK-1999?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14550448#comment-14550448
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Till Rohrmann commented on FLINK-1999:
--------------------------------------
You probably have to apply a similar trick as the {{FeatureHasher}} to map a
word of a dictionary with unknown size to a fixed-length vector. Alternatively,
you first calculate the dictionary of all known words and the corresponding
mapping.
> TF-IDF transformer
> ------------------
>
> Key: FLINK-1999
> URL: https://issues.apache.org/jira/browse/FLINK-1999
> Project: Flink
> Issue Type: New Feature
> Components: Machine Learning Library
> Reporter: Ronny Bräunlich
> Assignee: Alexander Alexandrov
> Priority: Minor
> Labels: ML
>
> Hello everybody,
> we are a group of three students from TU Berlin (I guess we're not the first
> group creating an issue) and we want to/have to implement a tf-idf tranformer
> for Flink.
> Our lecturer Alexander told us that we could get some guidance here and that
> you could point us to an old version of a similar tranformer.
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