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From Peter Klügl <peter.klu...@averbis.com>
Subject Re: Usage of anchors
Date Wed, 21 Aug 2019 10:10:21 GMT
Hi,

Am 20.08.2019 um 16:09 schrieb Dominik Terweh:
>
> Dear All,
>
>  
>
> I have some questions regarding processing times and anchors ("@").
>
>  
>
> First of all, is it possible to define an anchor on a disjunction?
>
> What I tested was to have a simple rule (1) that should start on the
> Element in the middle (2). Now this element had a variation (3) but I
> could not use the anchor in that case anymore:
>
> 1) A    B   C;       // works
>
> 2) A   @B   C;       // works
>
> 3) A @(B|D) C;       // NOT WORKING
>
> Is this behaviour intended or simply not supported?
>
> [NOTE: NOT WORKING means eclipse does not complain, but the rule never
> matches]
>
>  
>
> The above led to some testing with a different setup(4), however,
> since disjunctions don't seem to work, this was also not valid.
>
> 4) A @((B C) | (D C));   // NOT WORKING
>

Anchors at disjunct rule elements are syntactically supported but do not
work correctly. I will open a bug ticket.


>  
>
> Is there a scenario where anchors are valid in and before brackets?
> From my observation I've seen that (5)-(10) are all working as
> expected and all start matching on B. But, do they differ in terms of
> processing? I noticed slightly longer processing times in (5) and ever
> so slightly in (6), but not very indicative. Could (5)-(10) differ in
> processing time?
>
> 5)   A   @B C
>
> 6)  (A   @B C)
>
> 7) @(A   @B C)
>
> 8)   A  @(B C)
>
> 9)   A @(@B C)
>
> 10)  A  (@B C)
>

Yes since different combinations of methods are called, but I think
there should not be a big difference between (5)-(9).


>  
>
> Since rule (10) works as expected, why does (11) work differently and
> start on A but not on B and D? (This would be useful in a scenario
> where B and D combined appear less often than A)
>
> 11) A  ((@B C) | (@D C));   // starts matching on A
>
>  
>
>  
>

I have to check that. I think (10) start with A too.



Two comments for anchors and disjunct rule elements:

Anchors started as a manual option to optimize the rule execution time
compared tot he automatic dynamic anchoring. However, the anchor can
considerably change the consequences of a rule. For me, the anchor is
more of an engineering option which also can be used to speed up the rules.


Disjunct rule elements are not well supported and maintained in Ruta.
Their implementation is not efficient and they can lead to unintened
matches. Thus, their usage is not allowed in my team and I would not
recommend using them right now.


(I will try to find the time to improve the implementation)


Best,


Peter


> Thank you in advance for your answers,
>
> Best
>
> Dominik
>
> Dominik Terweh
> Praktikant
>
> *Drooms GmbH*
> Eschersheimer Landstraße 6
> 60322 Frankfurt, Germany
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>
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>
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>
-- 
Dr. Peter Klügl
R&D Text Mining/Machine Learning

Averbis GmbH
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Germany

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