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From "ASF GitHub Bot (JIRA)" <>
Subject [jira] [Commented] (SAMOA-78) Accept new values of a nominal attribute
Date Mon, 11 Dec 2017 15:29:09 GMT


ASF GitHub Bot commented on SAMOA-78:

GitHub user mgrzenda opened a pull request:

    SAMOA-78: Accept newly arriving values of nominal attributes

    This extension makes Attribute accept new values of nominal attributes arriving in the
stream. Hence, there is no need for preprocessing of the stream to discover all values of
nominal attributes first to put them e.g. in ARFF header next. 

You can merge this pull request into a Git repository by running:

    $ git pull SAMOA-78

Alternatively you can review and apply these changes as the patch at:

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #75
commit a92f9f36de856c5e8475b915de8c17763e537aef
Author: Maciej Grzenda <>
Date:   2017-12-11T15:21:03Z

    SAMOA-78: Accept newly arriving values of nominal attributes


> Accept new values of a nominal attribute
> ----------------------------------------
>                 Key: SAMOA-78
>                 URL:
>             Project: SAMOA
>          Issue Type: New Feature
>          Components: SAMOA-Instances
>            Reporter: Maciej Grzenda
> As of now, Attribute class assumes all values of a nominal attribute are defined before
stream processing starts. However, in case stream data evolves, for some attributes the complete
list of attribute values may not be known at the beginning. Hence, apart from declaring a
priori all attribute values e.g. in ARFF header, it sounds reasonable to gradually add new
attribute values once they are encountered in the instances. 

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