Hi All, We have been trying to use Syntax Models for Moses for some time now. We have trained tree-to-tree models and HPB models and were trying to compare the results with standard PBSMT models.
We use en-de as language pairs and about 1.2 million lines as training data. For tree to tree models we have used Berkeley Parser for parsing both languages. However i found that Tree-to-Tree scores were much lower(about 4 BLEU points) compared to the PBSMT models. The HPB model (hierarchical moses without syntax) is slightly better than the PBSMT models. Is this behaviour normal. I am quite new to syntax based models, hence the question. Also do we need to parse the devsets during tuning of the tree-to-tree models ? Thanks and regards, Pratyush Banerjee
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