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add README for major components; add eval scripts for dst and word_dst
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# Dialog State Tracking | ||
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In the pipeline task-oriented dialog framework, the DST module encodes | ||
the dialog history into a pre-defined state representation, which can be | ||
either structured or unstructured. | ||
In each turn, it takes as input the dialog act of user utterances, and updates | ||
its internal state variable. | ||
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This directory contains the interface definition of dialog state | ||
tracking module and some act-level DST module implementations. | ||
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## Interface | ||
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The interfaces of DST are defined in state_tracker.Tracker, including: | ||
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- **update** takes as input the new observation in each turn, and update | ||
the internal state variable of DST component. The new observation is the | ||
dialog act of user utterance, which may be the output of NLU module. | ||
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- **reset** reset the internal state variable for a new dialog session. |
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