Active Learning for Domain Classification in a Commercial Spoken Personal Assistant
This work addresses the challenge of reducing annotation costs for domain classification in personal assistants, though it is incremental as it builds on existing active learning methods.
The paper tackles the problem of efficiently selecting new training data for a domain classification component in a commercial spoken personal assistant, presenting a simple technique that identifies helpful examples for annotation, and results show it leads to higher accuracy improvements compared to random-selection and entropy-based methods given a fixed annotation budget.
We describe a method for selecting relevant new training data for the LSTM-based domain selection component of our personal assistant system. Adding more annotated training data for any ML system typically improves accuracy, but only if it provides examples not already adequately covered in the existing data. However, obtaining, selecting, and labeling relevant data is expensive. This work presents a simple technique that automatically identifies new helpful examples suitable for human annotation. Our experimental results show that the proposed method, compared with random-selection and entropy-based methods, leads to higher accuracy improvements given a fixed annotation budget. Although developed and tested in the setting of a commercial intelligent assistant, the technique is of wider applicability.