This paper discusses models for dialogue state tracking using recurrent neural networks (RNN). We present experiments on the standard dialogue state tracking (DST) dataset, DSTC2. On the one hand, RNN models became the state of the art models in DST, on the other hand, most state-of-the-art models are only turn-based and require dataset-specific preprocessing (e.g. DSTC2-specific) in order to achieve such results. We implemented two architectures which can be used in incremental settings and require almost no preprocessing. We compare their performance to the benchmarks on DSTC2 and discuss their properties. With only trivial preprocessing, the performance of our models is close to the state-of- the-art results.
Our system is related to the RNN tracker of , which reported near state-of-the art results on the DSTC2 dataset and introduced the first incremental system which was able to update the dialogue state word-by-word with such accuracy. In contrast to work of , we use no abstraction of slot values. Instead, we add the additional features as described in . The first system which used a neural network for dialogue state tracking @cite_17 used a feed-forward network and more than 10 manually engineered features across different levels of abstraction of the user input, including the outputs of the spoken language understanding component (SLU). In our work, we focus on simplifying the architecture, hence we used only features which were explicitly given by the dialogue history word representation and the database.
@cite_17
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We present our work in Dialog State Tracking Challenge 5, the main task of which is to track dialog state on human-human conversations cross language. Firstly a probabilistic enhanced framework is used to represent sub-dialog, which consists of three parts, the input model for extracting features, the enhanced model for updating dialog state and the output model to give the tracking frame. Meanwhile, parallel language systems are proposed to overcome inaccuracy caused by machine translation for cross language testing. We also introduce a new iterative alignment method extended from our work in DSTC4. Furthermore, a slot-based score averaging method is introduced to build an ensemble by combining different trackers. Results of our DSTC5 system show that our method significantly improves tracking performance compared with baseline method.