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Hi Wolfgang,<br>
<br>
Thanks for your answer.<br>
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).<br>
If I had an "inside" operator, do you think the following accumulate
option could be better? <br>
<br>
<tt>when<br>
<b>$result : ArrayList() from accumulate ( $s: Sentence(),
buildwindows($s))</b><br>
</tt><tt> <b> $w : SentenceWindows () </b></tt><b><tt>from
$result</tt></b><br>
<tt> </tt><tt> a1 : ManualAnnotation (this <b>inside </b>$w)<br>
a2 : ManualAnnotation (this != a1, </tt><tt>this <b>inside </b>$w</tt><tt>)<br>
</tt><tt>then<br>
... </tt><tt>do something with a1 and a2 since they are
"close" to each other</tt><br>
<tt> end</tt><br>
<br>
Does anyone know something about accumulator parametrization
(looking at the source code it does not seem to be possible,
though)?<br>
Maybe a syntax inspired of operator parametrization could be nice:<br>
<br>
<tt> $result : ArrayList() from accumulate ( $s: Sentence(),
<b> buildwindows[3]($s)</b>)<br>
</tt><br>
Best regards,<br>
<br>
Bruno.<br>
<br>
Le 19/08/2011 13:55, Wolfgang Laun a écrit :
<blockquote
cite="mid:CANaj1Lc0vq+LikW7jGeUhc6wvwQQ5PNU0xUvxTQ3o7EsY_qbVg@mail.gmail.com"
type="cite">There are some details that one should consider before
deciding on a particular implementation technique.<br>
<ul>
<li>Are all Sentences contiguous, i.e., s1.end = pred( s2.start
)</li>
<li>Can a ManualAnnotation start on one Sentence and end in the
next or any further successor?</li>
</ul>
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.<br>
<br>
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.<br>
<br>
-W<br>
<br>
<br>
<br>
<div class="gmail_quote">2011/8/19 Bruno Freudensprung <span
dir="ltr"><<a moz-do-not-send="true"
href="mailto:bruno.freudensprung@temis.com">bruno.freudensprung@temis.com</a>></span><br>
<blockquote class="gmail_quote" style="border-left: 1px solid
rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left:
1ex;">
<div bgcolor="#ffffff" text="#000000"> Hello,<br>
<br>
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.<br>
<br>
I need to write rules using the notion "window of
consecutive sentences". <br>
<br>
Basically I am not very interested by those "SentenceWindow"
objects, I just need them to define a kind of proximity
between "ManualAnnotation" objects.<br>
What I eventually need in the "when" of my rule is something
like:<br>
<br>
<tt>when<br>
... maybe something creating the windows<br>
a1 : ManualAnnotation ()<br>
a2 : ManualAnnotation (this != a1)<br>
SentenceWindow (this includes a1, this includes a2)<br>
then<br>
... do something with a1 and a2 since they are "close"
to each other<br>
end</tt><br>
<br>
As I don't know the "internals" of Drools, I would like to
have your opinion about what the best "idiom":<br>
<ul>
<li>create all SentenceWindow objects and insert them in
the working memory, then write rules against all the
facts (SentenceWindow and ManualAnnotation)<br>
</li>
<li>implement an accumulator that will create a list of
SentenceWindow object </li>
</ul>
<br>
The first option could look like:<br>
<br>
<code></code><code>rule "Create sentence windows"<br>
when<br>
# find 3 consecutive sentences<br>
s1 : Sentence()<br>
s2 : Sentence(this > s1)<br>
s3 : Sentence(this > s2)<br>
not Sentence(this != s2 && > s1
&& < s3)<br>
then<br>
SentenceWindow swindow = new SentenceWindow();<br>
swindow.setStart(s1.getStart());<br>
swindow.setTheend(s3.getEnd());<br>
insert(swindow);<br>
end</code><br>
<br>
... Then use the first rule "as is".<br>
<br>
The accumulator option could look like (I am not really sure
the syntax is correct) :<br>
<br>
<tt>when<br>
<b>$result : ArrayList() from accumulate ( $s:
Sentence(), buildwindows($s))</b><br>
</tt><tt> a1 : ManualAnnotation ()<br>
a2 : ManualAnnotation (this != a1)<br>
<b> SentenceWindows (this includes a1, this includes
a2) </b></tt><b><tt>from $result</tt></b><br>
<tt> then<br>
... </tt><tt>do something with a1 and a2 since they
are "close" to each other</tt><br>
<tt> end</tt><br>
<br>
Is it possible to decide if one way is best than the other?<br>
<br>
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)?<br>
I mean something like:<br>
<br>
<tt>when<br>
$result : ArrayList() from accumulate ( $s:
Sentence(), <b>buildwindows(3,</b> $s))<br>
</tt><br>
<br>
Thanks in advance for you insights,<br>
<br>
Best regards,<br>
<font color="#888888"> <br>
Bruno.<br>
</font></div>
<br>
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</blockquote>
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