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Unsupervised semantic intent discovery from call log acoustics

Xiao Li, Asela Gunawardana, and Alex Acero


Unforeseen user intents can account for a significant portion of unsuccessful calls in an automatic voice response system. Discovering these unforeseen semantic intents usually requires expensive manual transcriptions. We propose a method to cluster the acoustics from logged calls by their estimated semantic intents. This is achieved through training a mixture of language models in an unsupervised manner. Each cluster is presented to the application developer with a suggested language model to cover the semantic intent of the data in that cluster. The application developer validates the cluster and its suggested language model, and then updates the application. A quantative evaluation on a corporate voice-dialer application shows that updating the application in this manner yields a relative 13.4% reduction in semantic error rate.


Publication typeInproceedings
Published inInternational Conference on Acoustics, Speech, and Signal Processing
PublisherInstitute of Electrical and Electronics Engineers, Inc.
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