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<br>
I am not sure I understand what you mean by "random order" but I
guess it has to do with my ArrayList result type.<br>
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.<br>
My first guess was that such an accumulator might be faster than a
construction of windows using rules.<br>
However I admit your suggestion is very elegant, and I thank you for
that! I am probably still too imperative-minded...<br>
<br>
Regards,<br>
<br>
Bruno.<br>
<br>
Le 19/08/2011 16:05, Wolfgang Laun a écrit :
<blockquote
cite="mid:CANaj1LfZGMP6O7hMZdAKrTY3V1XxetTmTPK83DqjA=_Jj-FEVQ@mail.gmail.com"
type="cite">How would you write "buildwindows", given that its
"action" method would be called once for each Sentence, in random
order?<br>
<br>
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.<br>
1. Given a Sentence and no Window beginning with it, create a
Window of length 1.<br>
2. Given a Window of size n < desiredSize and given a Sentence
immediately following it, extend the Window to one of size n+1.<br>
3a. For any Window of desiredSize, inspect it for "closely
situated ManualAnnotations".<br>
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.<br>
<br>
-W<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"> <br>
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 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"
target="_blank">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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