@inproceedings{moore2004improving,
author = {Moore, Bob},
title = {Improving IBM Word Alignment Model 1},
year = {2004},
month = {July},
abstract = {We investigate a number of simple methods for improving the word-alignment accuracy of IBM Model 1. We demonstrate reduction in alignment error rate of approximately 30% resulting from (1) giving extra weight to the probability of alignment to the null word, (2) smoothing probability estimates for rare words, and (3) using a simple heuristic estimation method to initialize, or replace, EM training of model parameters.},
publisher = {Association for Computational Linguistics},
url = {http://approjects.co.za/?big=en-us/research/publication/improving-ibm-word-alignment-model-1/},
}