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Dialogue system, a dialogue method and a method of adapting a dialogue system

  • US 10,635,698 B2
  • Filed: 08/28/2017
  • Issued: 04/28/2020
  • Est. Priority Date: 02/13/2017
  • Status: Active Grant
First Claim
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1. A dialogue system comprising:

  • an input for receiving data relating to a speech or text signal originating from a user;

    an output for outputting information specified by an action; and

    a processor configured to;

    i) update a system state based on the input data using a state tracker model, wherein the system state comprises probability values associated with each of a plurality of possible values for each of a plurality of categories, wherein a category corresponds to a subject that the speech or text signal may relate to and can take on one or more values from a set of values;

    ii) identify one or more relevant categories based on at least part of the updated system state information using an identifier model;

    iii) define a set of information from stored information, the stored information comprising a plurality of action functions and categories, the set of information excluding categories which were not identified as relevant;

    iv) generate a reduced system state comprising the probability values associated with one or more of the plurality of possible values for each of the relevant categories;

    v) determine an action based on the reduced system state and the set of information using a policy model; and

    vi) output information specified by the determined action at the output, wherein the action comprises an action function combined with a relevant category or an action function,wherein the stored information and the plurality of categories are from a plurality of different pre-defined domain-specific ontologies, wherein a pre-defined domain corresponds to a particular dialogue topic and wherein the pre-defined domain-specific ontology comprises the plurality of categories and actions relating to the particular dialogue topic, and wherein the relevant categories comprise categories from different pre-defined domain-specific ontologies and the set of information comprises actions from different pre-defined domain-specific ontologies.

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