I am not sure I understand what you mean by "random order" but I guess
it has to do with my ArrayList result type.
What I had in mind is to put all sentences in a TreeSet during the
"action" method, and finally issue an ArrayList result object by
iterating over the TreeSet and grouping sentences.
My first guess was that such an accumulator might be faster than a
construction of windows using rules.
However I admit your suggestion is very elegant, and I thank you for
that! I am probably still too imperative-minded...
Regards,
Bruno.
Le 19/08/2011 16:05, Wolfgang Laun a écrit :
How would you write "buildwindows", given that its "action" method
would be called once for each Sentence, in random order?
It's very simple to write a very small set of rules to construct all
SentenceWindow facts of size 1 and then to extend them to any desired
size, depending on some parameter.
1. Given a Sentence and no Window beginning with it, create a Window
of length 1.
2. Given a Window of size n < desiredSize and given a Sentence
immediately following it, extend the Window to one of size n+1.
3a. For any Window of desiredSize, inspect it for "closely situated
ManualAnnotations".
3b. If ManualAnnotations have been associated with their containing
Sentences up-front, you just need to find Windows with more than 1
ManualAnnotation, adding them in the RHS of rule 2 above.
-W
2011/8/19 Bruno Freudensprung <bruno.freudenspr...@temis.com
<mailto:bruno.freudenspr...@temis.com>>
Hi Wolfgang,
Thanks for your answer.
Sentences are not contiguous (might be some space characters in
between) but manual annotations cannot overlap sentences
(interpret "overlap" in terms of Drools Fusion terminology).
If I had an "inside" operator, do you think the following
accumulate option could be better?
when
*$result : ArrayList() from accumulate ( $s: Sentence(),
buildwindows($s))*
*$w : SentenceWindows () **from $result*
a1 : ManualAnnotation (this *inside *$w)
a2 : ManualAnnotation (this != a1, this *inside *$w)
then
... do something with a1 and a2 since they are "close" to each
other
end
Does anyone know something about accumulator parametrization
(looking at the source code it does not seem to be possible, though)?
Maybe a syntax inspired of operator parametrization could be nice:
$result : ArrayList() from accumulate ( $s: Sentence(),
*buildwindows[3]($s)*)
Best regards,
Bruno.
Le 19/08/2011 13:55, Wolfgang Laun a écrit :
There are some details that one should consider before deciding
on a particular implementation technique.
* Are all Sentences contiguous, i.e., s1.end = pred( s2.start )
* Can a ManualAnnotation start on one Sentence and end in the
next or any further successor?
As in all problems where constraints depend on an order between
facts, performance is going to be a problem with increasing
numbers of Sentences and ManualAnnotations.
Your accumulate plan could be a very inefficient approach.
Creating O(N*N) pairs and then looking for an overlapping window
is much worse than looking at each window, for instance. But it
depends on the expected numbers for both.
-W
2011/8/19 Bruno Freudensprung <bruno.freudenspr...@temis.com
<mailto:bruno.freudenspr...@temis.com>>
Hello,
I am trying to implement rules handling "Sentence",
"ManualAnnotation" objects (imagine someone highligthing
words of the document). Basically "Sentence" objects have
"start" and "end" positions (fields) into the text of a
document, and they are Comparable according to their location
into the document.
I need to write rules using the notion "window of consecutive
sentences".
Basically I am not very interested by those "SentenceWindow"
objects, I just need them to define a kind of proximity
between "ManualAnnotation" objects.
What I eventually need in the "when" of my rule is something
like:
when
... maybe something creating the windows
a1 : ManualAnnotation ()
a2 : ManualAnnotation (this != a1)
SentenceWindow (this includes a1, this includes a2)
then
... do something with a1 and a2 since they are "close" to
each other
end
As I don't know the "internals" of Drools, I would like to
have your opinion about what the best "idiom":
* create all SentenceWindow objects and insert them in
the working memory, then write rules against all the
facts (SentenceWindow and ManualAnnotation)
* implement an accumulator that will create a list of
SentenceWindow object
The first option could look like:
|||rule "Create sentence windows"
when
# find 3 consecutive sentences
s1 : Sentence()
s2 : Sentence(this > s1)
s3 : Sentence(this > s2)
not Sentence(this != s2 && > s1 && < s3)
then
SentenceWindow swindow = new SentenceWindow();
swindow.setStart(s1.getStart());
swindow.setTheend(s3.getEnd());
insert(swindow);
end|
... Then use the first rule "as is".
The accumulator option could look like (I am not really sure
the syntax is correct) :
when
*$result : ArrayList() from accumulate ( $s: Sentence(),
buildwindows($s))*
a1 : ManualAnnotation ()
a2 : ManualAnnotation (this != a1)
*SentenceWindows (this includes a1, this includes a2) **from
$result*
then
... do something with a1 and a2 since they are "close" to
each other
end
Is it possible to decide if one way is best than the other?
And one last question: it is possible to "parametrize" an
accumulator (in order to provide the number of sentences that
should be put in the windows)?
I mean something like:
when
$result : ArrayList() from accumulate ( $s: Sentence(),
*buildwindows(3,* $s))
Thanks in advance for you insights,
Best regards,
Bruno.
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