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Subject: CAS Multipliers and Pipeline Troubles
Date: Mon, 22 Jun 2009 13:34:24 +0200
Message-ID: 
 <0DBCCB475CDE864F8F6086D69BFC5D9F03A392D7@CALLISTO.ntdom.tk.informatik.tu-darmstadt.de>
Thread-Topic: CAS Multipliers and Pipeline Troubles
Thread-Index: AcnzLWSDDOKXv+qcTWq89LJgMxL7lQ==
From: "Valkyrie Savage" <savage@tk.informatik.tu-darmstadt.de>
To: <uima-user@incubator.apache.org>


Hello, all,

I'm working on a project involving UIMA, and I've run into some =
difficulties that I can't figure out.  This is my first month working =
with UIMA, so I am admittedly not well-versed in all its components and =
interactions, but I'll try to describe my problem as best I can.  I'm =
running UIMA 2.2.2-incubating with Java 1.6 inside of Eclipse Ganymede.

The project involves processing rather large documents, and the in-house =
components that I'm using have difficulty reading in a book-length chunk =
of text at a time.  For this reason, I've developed a very simple CAS =
multiplier; it takes in a CAS that contains Segment annotations and =
generates a new CAS for each Segment.  This multiplier is contained in =
an aggregate AE, and the other components of the AE are used for adding =
a few new annotations.  At the end of the aggregate is a simple CAS =
demultiplier; it is based heavily on the example in =
org.apache.uima.examples.casMultiplier, except that I hardcoded the tags =
that I want to copy across the demultiplying.

The problem that I am coming across is that the split CASes are being =
tagged correctly and merged correctly, but for whatever reason the =
merged CAS is not the one that is being sent on through the rest of the =
pipeline after this aggregate AE.  I have a simple CAS printer running =
at the end of the next() function of my demultiplier that shows that =
only the tags that I wanted are being retained after the merge, but they =
appear again if I add an AnnotationWriter in the next step of the =
pipeline.  I read about Flow Controllers, and it seems that the original =
CAS should be dropped from the pipeline by default, since new CASes are =
being created from it (I am not using any kind of user-defined Flow =
Controller), but that doesn't seem to be happening.  None of the new =
tags added in the Aggregate AE are being preserved, but all the tags =
that are supposed to be stripped out are being preserved.

If there's more information needed, I'll be happy to provide it.  As I =
mentioned, I'm new to UIMA, and I'm not sure how to go about trying to =
debug this.

Thank you!

Valkyrie Savage