Lab 3 (due 1/25)
The goal of this lab is to continue development of your test suite
on the one hand, and to refine your starter grammar on the other. We
will be extending both to cover additional phenomena, but you may wish
to revisit some of the sentences/choices from Lab 2. Again, you'll
want to work on these two subtasks in parallel, though they are
described separately in the instructions below.
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In order to encourage people to get started earlier, this
assignment requires that you post a question to GoPost by
If you haven't already put your work for this class under version
control, do so now.
- Read David's wiki pages on subversion (svn).
- Request an acccount on lemur, our svn server,
from linghelp-at-u (David Brodbeck).
- Decide on a project name (e.g., the name of your language)
and create a directory of that name.
- Put your test suite text file from Lab 2 into that directory.
- Put a copy of your choices from from Lab 2 into that directory.
- (We'll put the grammars themselves under version control once we're done downloading them. Until then, it'll just be annoying, and all the information is in the choices files anyway.)
- From the directory above your project directory, invoke the following command:
svn import project-name svn://lemur.ling.washington.edu/students/username/project-name
Where "project-name" should be the name of your directory (two instances), and "username" is your username on the system.
- Move your old version of that directory out of the way:
mv project-name project-name-old
- Check out a working copy from svn:
svn checkout svn://lemur.ling.washington.edu/students/username/project-name
- Check that it's the same as what you had:
diff -r project-name-old project-name
- If so, delete the version that's not under svn:
rm -r project-name-old
- As you make changes to your test suite, commit them to the svn repository:
- Added bonus: If you are working on separate machines (e.g., if you want to work in the Treehouse, say, to get my help in debugging something during my office hours), you can use svn to keep the locations in sync.
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The first task is to create positive and negative example sentences
illustrating the following phenomena, to the extent that they
are relevant for your language:
Before you start, read the general instructions for
testsuites and the formatting
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The second task is to create a starter grammar by filling out
the required sections of the Grammar Matrix customization questionnaire. In
particular, you'll need to address these sections:
- Verbal features
- Sentential negation
- Matrix Yes/No Questions
Begin by uploading your choices file from lab 2, and modify from
NB: The sentential negaiton and matrix yes/no questions sections
might have more than their usual share of bugs. So start early so we have
a chance to work that out.
You'll likely need to include your lexicon section, e.g., to put
in tense/aspect affixes and/or include tense/aspect information
on existing affixes and/or include auxiliaries.
I will try to get feedback on lab2 to you quickly. Please read
that feedback for any other suggestions on how to improve your choices file.
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Make sure you can parse individual sentences
Once you have created your starter grammar (or each time you
create one, as you should iterate through grammar creation and
testing a few times as you refine your choices), try it out on a
couple of sentences interactively to see if it works:
- Load the grammar into the LKB.
- Using the parse dialog box (or 'C-c p' in emacs to get the parse
command inserted at your prompt), enter a sentence to parse.
- Examine the results. If it does parse, check out the semantics (pop-up menu on the little trees). If it doesn't look at the parse chart to see why not.
- Problems with lexical rules and lexical entries often become apparent here, too: If the LKB can't find an analysis for one of your words, it will say so, and (obviously) fail to parse the sentence.
Note that the questionnaire has a section for test sentences. If
you use this, then the parse dialog will be pre-filled with your test sentences.
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[incr tsdb()] profile
The final step for this lab is to use the [incr tsdb()] grammar
profiling system to test the performance of your starter grammar over
your test suite, and then examine the results. (You may find in doing
so that you want to refine certain aspects of your starter grammar.
You can do this by uploading the file "choices" which comes with your
grammar into the customization system and then tweaking from there.)
Create a test suite profile
- Create a directory called tsdb inside your grammar
- Inside tsdb, create two subdirectories: home (for
test suite instances) and skeletons (for skeletons).
- Save a copy of Index.lisp in
- Save a copy of Relations in
tsdb/skeletons. (If your browser doesn't like files without
extensions, here's another copy of the
same file with .txt appended. You should save it as just Relations.)
- Make a subdirectory called lab2 inside
tsdb/skeletons for your test suite. (If you choose a different
name for this subdirectory, you must edit Index.lisp accordingly.)
- Download the perl script make_item.pl
and run it on your test suite:
perl make_item.pl testsuite.txt
- (If the perl script doesn't like the formatting of your test suite,
edit the test suite appropriately and/or complain about the perl
script on GoPost.)
- Copy the .item file which is output by make_item.pl
- Copy tsdb/skeletons/Relations to tsdb/skeletons/lab2/relations (notice the change from R to r).
Create and run an initial test suite instance
- Start the lkb
- Load your starter grammar. (The script file is in matrix/lkb/script.)
- Start [incr tsdb()] (within emacs, that's M-x itsdb)
- In the [incr tsdb()] podium, select Options > Database Root
and input the path to tsdb/home.
- In the [incr tsdb()] podium, select Options > Skeleton Root
and input the path to tsdb/skeletons.
- Optional: For future use, you can set these variables
ahead of time in a file called .tsdbrc in your home directory.
It should contain these lines, with path names edited appropriately:
(setf *tsdb-home* "path-to-tsdb/home")
(setf *tsdb-skeleton-directory* "path-to-tsdb/skeletons")
- In the [incr tsdb()] podium, select File > Create. You should
see your test suite in the menu there. Select it, and get a test suite
instance. Post to GoPost if this doesn't work.
- Make sure your grammr is loaded into the LKB.
- Once you have a test suite instance, select it (by clicking on it),
then do Process > All Items.
- Explore the results, with functions such as Browse > Results and Analyze > Competence.
- Be sure to save (i.e., not overwrite or delete) this test suite
instance, as you'll be asked to turn it in.
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Your write up should include the following:
- Documentation the new or revised choices you made in the customization
system, illustrated with examples from your test suite. (Diff your lab2 and lab3 choices files to make sure you've caught all the changes.) Update 1/22/09: Here's an example of what this should look like.
- Descriptions of any properties of your language illustrated
in your test suite but not covered by your starter grammar and/or
the customization system.
- Documentation the coverage of your grammar over the testsuite.
If there are examples that thare parsed incorrectly (unanalyzed
grammatical examples, analyzed ungrammatical examples, or grammatical
examples assigned surprising parses), reflect on why that might be.
- Finally, if there are any places where the customization system
seems unable to cope with the properties of your language (within the
phenomena addressed in this lab), describe them here.
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ebender at u dot washington dot edu
Last modified: Sun Jan 25 21:25:10 PST 2009