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43 lines
1.4 KiB
Plaintext
43 lines
1.4 KiB
Plaintext
Re-implementation of Johnson et al. (2007)'s phrasetable filtering strategy.
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This implementation relies on Joy Zhang's SALM Suffix Array toolkit. It is
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available here:
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http://projectile.sv.cmu.edu/research/public/tools/salm/salm.htm
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--Chris Dyer <redpony@umd.edu>
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BUILD INSTRUCTIONS
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---------------------------------
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1. Download and build SALM.
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2. make SALMDIR=/path/to/SALM
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USAGE INSTRUCTIONS
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---------------------------------
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1. Using the SALM/Bin/Linux/Index/IndexSA.O32, create a suffix array index
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of the source and target sides of your training bitext.
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2. cat phrase-table.txt | ./filter-pt -e TARG.suffix -f SOURCE.suffix \
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-l <FILTER-VALUE>
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FILTER-VALUE is the -log prob threshold described in Johnson et al.
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(2007)'s paper. It may be either 'a+e', 'a-e', or a positive real
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value. 'a+e' is a good setting- it filters out <1,1,1> phrase pairs.
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I also recommend using -n 30, which filteres out all but the top
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30 phrase pairs, sorted by P(e|f). This was used in the paper.
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3. Run with no options to see more use-cases.
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REFERENCES
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---------------------------------
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H. Johnson, J. Martin, G. Foster and R. Kuhn. (2007) Improving Translation
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Quality by Discarding Most of the Phrasetable. In Proceedings of the 2007
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Joint Conference on Empirical Methods in Natural Language Processing and
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Computational Natural Language Learning (EMNLP-CoNLL), pp. 967-975.
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