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authorredpony <redpony@ec762483-ff6d-05da-a07a-a48fb63a330f>2010-06-22 05:12:27 +0000
committerredpony <redpony@ec762483-ff6d-05da-a07a-a48fb63a330f>2010-06-22 05:12:27 +0000
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+Instructions for running the compound splitter, which is a reimplementation
+and extension (more features, larger non-word list) of the model described in
+
+ C. Dyer. (2009) Using a maximum entropy model to build segmentation
+ lattices for MT. In Proceedings of NAACL HLT 2009,
+ Boulder, Colorado, June 2009
+
+If you use this software, please cite this paper.
+
+
+GENERATING 1-BEST SEGMENTATIONS AND LATTICES
+------------------------------------------------------------------------------
+
+Here are some sample invokations:
+
+ ./compound-split.pl --output 1best < infile.txt > out.1best.txt
+ Segment infile.txt according to the 1-best segmentation file.
+
+ ./compound-split.pl --output plf < infile.txt > out.plf
+
+ ./compound-split.pl --output plf --beam 3.5 < infile.txt > out.plf
+ This generates denser lattices than usual (the default beam threshold
+ is 2.2, higher numbers do less pruning)
+
+
+MODEL TRAINING (only for the adventuresome)
+------------------------------------------------------------------------------
+
+I've included some training data for training a German language lattice
+segmentation model, and if you want to explore, you can or change the data.
+If you're especially adventuresome, you can add features to cdec (the current
+feature functions are found in ff_csplit.cc). The training/references are
+in the file:
+
+ dev.in-ref
+
+The format is the unsegmented form on the right and the reference lattice on
+the left, separated by a triple pipe ( ||| ). Note that the segmentation
+model inserts a # as the first word, so your segmentation references must
+include this.
+
+To retrain the model (using MAP estimation of a conditional model), do the
+following:
+
+ cd de
+ ./TRAIN
+
+Note, the optimization objective is supposed to be non-convex, but i haven't
+found much of an effect of where I initialize things. But I haven't looked
+very hard- this might be something to explore.
+