|Title||Using Dependency Grammar Features in Whole Sentence Maximum Entropy Language Model for Speech Recognition|
|Publication Type||Conference Paper|
|Year of Publication||2010|
|Authors||Ruokolainen, T, Alumäe, T, Dobrinkat, M|
|Conference Name||The Fourth International Conference Baltic HLT 2010|
|Conference Location||Amsterdam, The Netherlands|
In automatic speech recognition, the standard choice for a language model is the well-known n-gram model. The n-grams are used to predict the probability of a word given its n-1 preceding words. However, the n-gram model is not able to explicitly learn grammatical relations of the sentence. In the present work, in order to augment the n-gram model with grammatical features, we apply the Whole Sentence Maximum Entropy framework. The grammatical features are head-modifier relations between pairs of words, together with the labels of the relationships, obtained with the dependency grammar. We evaluate the model in a large vocabulary speech recognition task with Wall Street Journal speech corpus. The results show a substantial improvement in both test set perplexity and word error rate.