I think this is really useful. I'm not convinced the word nominal is
well-known enough to be completely clear in this context.
what about
define stream weather( outlook options={sunny, overcast, rainy} )
Paul
On 21 September 2014 19:45, Ginnaliya Gamathige, Lahiru Manananda <
[email protected]> wrote:
> Hi Devs,
>
> I am developing a classification algorithm for siddhi and I have a
> requirement of defining attributes as a nominal attribute.
>
> Nominal attribute is similar to a string attribute but during the
> definition we have to give the possible values for that attribute.
> One of the value from that set can come as the actual value in a
> particular event. I can see in the code Siddhi doesn’t support this (Please
> correct me if I am wrong), so
> I am thinking of changing the Siddhi language grammar to parse nominal
> attribute as below.
>
> Example query: define stream weather(outlook nominal{sunny, overcast,
> rainy}, temperature nominal{hot, mild, cool}, humidity nominal{high,
> normal},windy nominal{TRUE, FALSE},play nominal{yes, no}).
>
> If there is a better way to do this, please provide me some feedback.
>
> During the classification algorithm it will use numeric values which
> maps to these possible values(Ex: sunny=0,overcase=1,rainy=2) and do the
> calculation using numeric values. Initial phase of the algorithm
> I am implementing[1], I hope to process nominal values (which is easy to
> implement), then algorithm should support processing numeric data too.
>
> If you have any feedback please let me know.
>
> [1]http://homes.cs.washington.edu/~pedrod/papers/kdd00.pdf
>
> Regards
> Lahiru
>
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