Semantic parsing as machine translation
Most work on semantic parsing, even in variable-free formulations, has focused on developing task- and formalism-specific models, often with expensive training and decoding procedures. Can we use standard machine translation tools to perform the same task?
For a description of the system (it's really not complicated), see:
- J Andreas, A Vlachos and S Clark. "Semantic Parsing as Machine Translation". In ACL-short 2013. http://www.cs.berkeley.edu/~jda/papers/avc_smt_semparse.pdf
You should also check out Carolin Lawrence's cdec-based reimplementation at https://github.com/carhaas/cdec-semparse.
dependencies.yaml to reflect the configuration of your system.
smt_semparse should be set to the location of the repository root, the
srilm, etc. entries to the roots of the corresponding external
srilm_arch to your machine architecture.
Reproducing the ACL13 paper
Edit settings.yaml to choose a language and translation model for the particular experiment you want to run. Use the following additional settings:
lang=en -> stem=true, symm=srctotgt lang=de -> stem=true, symm=tgttosrc lang=el -> stem=false, symm=tgttosrc lang=th -> stem=false, symm=tgttosrc
Note that due to random MERT initialization your exact accuracy and F1 values may differ slightly from those in the paper.
Additional settings also allow you to do the following:
Rebuild the phrase table after running MERT to squeeze a few more translation rules out of the training data. (Should give a nearly-imperceptible improvement in accuracy.)
Filter rules which correspond to multi-rooted forests from the phrase table. (Should decrease accuracy.)
Do full-supervised training on only a fraction of the dataset, and use the remaining monolingual data to reweight rules. (Mostly garbage---this data set is already too small to permit experiments which require holding out even more data.)
MRL-to-NL à la Lu & Ng 2011.
Using a new dataset
extractor.py to create appropriately-formatted files in the working
directory. See the existing GeoQuery extractor for an example.