One-expression classification in Bengali and its role in Bengali-English machine translation

This paper attempts to analyze one-expressions in Bengali and shows its effectiveness for machine translation. The characteristics of one-expressions are studied in 177 million word corpus. A classification scheme has been proposed for the grouping the one-expressions. The features contributing towards the classification are identified and a CRF-based classifier is trained on an authors' generated annotated dataset containing 2006 instances of one-expressions. The classifier's performance is tested on a test set (containing 300 instances of Bengali one-expressions) which is different from the training data. Evaluation shows that the classifier can correctly classify the one-expressions in 75% cases. Finally, the utility of this classification task is investigated for machine translation (Bengali-English). The translation accuracy is improved from 39% (by Google translator) to 60% (by the proposed approach) and this improvement is found to be statistically significant. All the annotated datasets (there was none before) are made free to facilitate further research on this topic.