KR101677859B1 - Method for generating system response using knowledgy base and apparatus for performing the method - Google Patents
Method for generating system response using knowledgy base and apparatus for performing the method Download PDFInfo
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- KR101677859B1 KR101677859B1 KR1020150126046A KR20150126046A KR101677859B1 KR 101677859 B1 KR101677859 B1 KR 101677859B1 KR 1020150126046 A KR1020150126046 A KR 1020150126046A KR 20150126046 A KR20150126046 A KR 20150126046A KR 101677859 B1 KR101677859 B1 KR 101677859B1
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Abstract
Description
The present invention relates to an interactive system, and more particularly, to a method for generating a system response suitable for user utterance using a knowledge base and an apparatus for performing the system response.
BACKGROUND ART [0002] With the recent development of information processing technology, utilization of a dialogue system (Dialogue System) that provides interaction between a user terminal such as a smart phone, a tablet PC, a PDA (Personal Digital Assistant), and a smart home appliance has been popularized.
Currently, conversation systems are mainly used for purpose-oriented technologies that provide specific services to users and chat technologies that provide daily conversations. However, as the age of big data comes, conversation systems are becoming more popular in contents search, intelligent robots, Researches are being actively carried out for application to a wide range of technical fields such as PC, telematics, and home network.
The conversation system is required to have a technique for generating a system response suitable for user utterance.
Thus, conventionally, the intention of the user utterance is analyzed based on the corpus, the response example corresponding to the utterance intention of the user is extracted from the pre-constructed response sample database, and the extracted response example is compared with the context, We generated a system response suitable for user utterance by substituting the entity name for the purpose.
Specifically, for example, when a user utters a sentence of "I like Kim Yu-Na", a response example suitable for user utterance is extracted from a pre-constructed response sample database, and the object name of the response example is information By replacing it with 'Kim Yu-na', a system response such as "I like Kim Yu-na" or "Why do you like Kim Yu-na?"
The above-described conventional techniques generate a system response so that the user's uttered contents are included, thereby enhancing the realism of the conversation, but there is a limitation in that the system response that can be generated is simple and limited.
In addition, since the information included in the user utterance is referred to again through the system response, the conversation between the user and the conversation system proceeds monotonically, which lowers the satisfaction of users using the conversation system.
SUMMARY OF THE INVENTION An object of the present invention is to provide a system response generation method and apparatus capable of generating various system responses to a user utterance by using a knowledge base.
It is another object of the present invention to provide a system response generation method and apparatus capable of improving user satisfaction with an interactive system by generating various system responses to a user utterance using a knowledge base.
According to an aspect of the present invention, there is provided a method for generating a system response, the method comprising: extracting a named entity from an input sentence when an input sentence is received, Extracting knowledge associated with the entity name from a pre-established knowledge base, and generating a system response to the input sentence by replacing the system response candidate extracted in advance so as to reflect the knowledge extracted from the pre-constructed knowledge base .
Here, the step of extracting the object name from the input sentence includes analyzing the input sentence based on at least one of a part of speech tagger, a parser, a triple extractor, The part of speech information of each word constituting the sentence and the relationship information between the words can be extracted.
Here, the step of extracting the object name from the input sentence includes at least one of a name, a place name, an institution name, a name of object, and a time among the words constituting the input sentence based on the part of speech information and the relationship information of each word constituting the input sentence Can be extracted as the object name.
Here, the prebuilt knowledge base is a database structured by storing a tremendous amount of knowledge generated by an expert of various fields or a plurality of users in a triple form, and each knowledge is identified by the entity name Knowledge can be linked based on the type to which each knowledge belongs or the property each knowledge has.
The step of extracting the knowledge associated with the object name includes extracting knowledge having the same object name as the object name extracted from the input sentence in the pre-constructed knowledge base, extracting a plurality of knowledge And extracting knowledge associated with the input sentence from among the extracted knowledge.
Here, the step of selecting the knowledge associated with the object name of the input sentence includes a step of selecting the knowledge similarity between the object name extracted from the input sentence and the personal information of the user who inputs the input sentence, It is possible to determine the knowledge to be reflected in the system response among the plurality of knowledge extracted based on the calculated association score.
Here, the response template corresponding to the intention of the input sentence among the plurality of response templates stored in the previously constructed response candidate database may be selected as the system response candidate extracted in advance.
Here, generating a system response to an input sentence may generate a system response to the input sentence by replacing the response template with the knowledge constituting the input sentence and the knowledge selected from the prebuilt knowledge base .
According to another aspect of the present invention, there is provided an apparatus for generating a system response, the apparatus comprising: an object name extracting unit, which is implemented by an interactive system and extracts an object name from an input sentence when an input sentence is received; And a system response generator for generating a system response to the input sentence by replacing the system response candidate extracted in advance so as to reflect the knowledge extracted from the knowledge base constructed in advance and a knowledge extraction unit for extracting knowledge associated with the object name from the knowledge base .
According to the system response generating method and apparatus according to the embodiment of the present invention as described above, various system responses to user utterances can be generated by using the knowledge base.
Accordingly, user satisfaction with the conversation system can be improved, and the conversation system can be easily applied to a wide variety of technical fields.
1 is a flowchart illustrating a system response generation method using a knowledge base according to an embodiment of the present invention.
FIG. 2 is a diagram for explaining extraction of an object name in an input sentence according to an embodiment of the present invention.
FIG. 3 is a flowchart illustrating extraction of knowledge associated with an entity name extracted from an input sentence in a knowledge base according to an embodiment of the present invention.
4 is an exemplary diagram illustrating generating a system response to reflect knowledge extracted from a knowledge base according to an embodiment of the present invention.
5 is a block diagram illustrating an interactive system in which a system response generating device using a knowledge base according to an embodiment of the present invention is implemented.
While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing.
The terms first, second, A, B, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.
It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.
The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.
Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.
Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a flowchart illustrating a method of generating a system response using a knowledge base according to an embodiment of the present invention. FIG. 2 is a diagram illustrating extraction of an object name from an input sentence according to an exemplary embodiment of the present invention.
FIG. 3 is a flowchart illustrating extraction of knowledge associated with an object name extracted from an input sentence in a knowledge base according to an embodiment of the present invention. FIG. 4 is a flowchart illustrating a method of extracting knowledge extracted from a knowledge base according to an embodiment of the present invention ≪ / RTI > FIG.
Referring to FIG. 1, a system response generating method using a knowledge base may be performed by a system response generating apparatus implemented in an interactive system.
Here, the conversation system includes a user terminal such as a smart phone, a tablet PC, a PDA (Personal Digital Assistant), a navigation device, a notebook computer, a smart home appliance, and a system robot, The present invention is not limited thereto and can be easily applied to various devices and technology fields requiring interaction with a user.
The conversation system must implement a technique that generates a system response corresponding to the user utterance. However, the conventional system response generating technology has a limitation in that the system response that can be generated for the user utterance is simple and limited, and the conversation between the user and the conversation system proceeds monotonously, and the satisfaction of the user using the conversation system is low.
In order to overcome the limitations of the prior art described above, the present invention proposes a system response generation method that extracts knowledge related to user utterance in a knowledge base and reflects it in a system response.
The system response generation method proposed in the present invention includes a step S100 of extracting an object name from an input sentence, a step S200 of extracting knowledge associated with an object name from the knowledge base, and a step S200 of reflecting the knowledge extracted from the knowledge base, To generate a system response (S300).
As the input sentence is received, a named entity can be extracted from the received input sentence (S100).
Herein, the input sentence means a sentence which is recognized by the user and converted into text, but is not limited thereto, and may include text information inputted by the user for the application installed in the user terminal or for use of the online service.
In order to extract an object name from an input sentence, first, an input sentence is analyzed by analyzing an input sentence based on at least one of a part of speech tagger, a parser, a triple extractor, It is possible to extract the relation information between the parts-of-speech information of each word and the word constituting the input sentence.
In this case, the part-of-speech information may mean information such as a noun, a pronoun, an investigation, an investigation, a verb, an adjective, an adjective, an adverb, and an admiration classified according to function, form or meaning of each word constituting the input sentence, Information may mean information such as a subject, a descriptor, an object, a bore, a modifier, and the like classified according to a role and a dependency relationship of each word constituting the input sentence in the input sentence, but is not limited thereto.
Named entities can be extracted from the words constituting the input sentence based on the extracted parts information and the relation information between the words constituting the input sentence by analyzing the input sentence.
Specifically, words having relation information of 'subject', 'object', and 'bore' can be extracted as the object name having the part of speech information of 'noun' among the words constituting the input sentence. At this time, the extracted entity name may mean a word representing a person, a place name, an institution name, a name of object, a time, etc., but is not limited thereto.
Specifically, for example, when the
Thus, the word 'Kim-yuna' having the part of
In this example, the object name is extracted using the parts-of-speech information and the relationship information of the words constituting the input sentence. However, the present invention is not limited to this, and it is possible to perform labeling by using dictionary-based matching technique or corpus collected in advance. And then extract the object name from the input sentence using a probability-based language model such as word n-gram or the like.
Once the entity name is extracted from the input sentence, the knowledge associated with the entity name can be extracted from the pre-established knowledge base (S200).
Here, the knowledge base is a database structured and stored for each of a large amount of knowledge generated by experts in various fields or a plurality of users, and may represent a DBpedia, a freebase, and the like But is not limited thereto.
The knowledge base stores a vast amount of knowledge in the form of entity-type-entity-entity-entity-property-entity triples . In this case, an entity refers to unique information indicating each knowledge so as to identify a vast amount of knowledge stored in the knowledge base, a property means a property or property possessed by each knowledge, (type) can mean pre-set information to classify a vast amount of knowledge stored in a knowledge base by grouping similar knowledge of attributes.
For example, if knowledge in a knowledge base has a type of 'figure skater', such as' Kim Yu-na ', it will be linked to' Maeda Asada ', an intellectual with the same type as' Kim Yu- And can be stored in a triple-type structure. As such, the vast amount of knowledge stored in the knowledge base can be linked through types or attributes.
In order to extract the knowledge associated with the entity name extracted from the input sentence in the knowledge base, a step S210 of extracting knowledge having an entity name identical to the entity name of the input sentence as shown in FIG. 3 (S210) (S220) of extracting knowledge from the input sentence, and sorting knowledge associated with the input sentence among the extracted knowledge (S230).
Specifically, for example, when the
The knowledge base extracts the knowledge associated with the 'figure skater' which is the type of the object name 'Kim-yuna', or extracts the knowledge associated with the attributes' Kim-yuna ',' coach ',' birthday ',' &Quot; (S220). ≪ / RTI >
Among the plurality of knowledge extracted from the knowledge base, knowledge having a relatively high correlation with the input sentence can be selected (S230). Specifically, it is possible to calculate the semantic similarity between each of the knowledge extracted from the input sentence and each of a plurality of knowledge extracted from the knowledge base, or calculate the similarity degree from the knowledge base based on the number or frequency of use of each of the plurality of knowledge, The association scores for each of the extracted knowledge items are calculated and the knowledge to be reflected in the system response among the plurality of knowledge items can be determined using the calculated association scores.
In particular, in calculating the association score for each of a plurality of knowledge extracted from the knowledge base to determine knowledge to be reflected in the system response, a system response suitable for each user can be generated by reflecting the user's personal information and interest information.
When the knowledge associated with the input sentence is extracted from the knowledge base, a system response to the input sentence can be generated by replacing the system response candidate extracted in advance so as to reflect the knowledge (S300).
Here, the response candidate corresponding to the intention of the input sentence among the plurality of response templates stored in the pre-established response candidate database may be selected as the system response candidate.
If the
If the intention of the
Therefore, the [verb] slot of the response template 30 is replaced with 'like' corresponding to the verb among the words constituting the
As described above, the present invention can provide various system responses as compared with the conventional system response generation technology by generating the system response by reflecting both the words constituting the input sentence and the knowledge extracted from the knowledge base, User satisfaction is expected to be improved.
5 is a block diagram illustrating an interactive system in which a system response generating device using a knowledge base according to an embodiment of the present invention is implemented.
Referring to FIG. 5, the system
Here, the
The
First, the system
The entity
More specifically, the object
The
Here, the
The
That is, the
In particular, the
In addition, in calculating the association score for each of a plurality of knowledge extracted from the knowledge base to determine knowledge to be reflected in the system response, a system response suitable for each user can be generated by reflecting the user's personal information and interest information.
The system
To this end, the user
The
The system
The natural
The system configuration of the
In addition, the operation of the system
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that
10: Input sentence 11: Part of speech information
13: Relationship information 15: Object name
20: Extracted knowledge 30: Response template
40: System response
100: System response generator 110: Object name extractor
120: knowledge extracting unit 130: system response generating unit
140: knowledge base 200: conversation system
210: user utterance understanding part 220: conversation management part
230: natural language generation unit 240: response candidate DB
Claims (16)
Extracting a named entity from the received input sentence as the input sentence is received;
Extracting knowledge associated with the entity name from a pre-established knowledge base; And
Generating a system response for the input sentence by replacing a system response candidate extracted in advance so as to reflect the knowledge extracted from the pre-built knowledge base,
Wherein the knowledge base stores each knowledge identified by the entity name in a triple type structure by linking each knowledge based on a type to which each knowledge belongs or an attribute of each knowledge,
Wherein the knowledge associated with the entity name is knowledge related to the input statement among a plurality of knowledge linked to knowledge having an entity name equal to the extracted entity name in the knowledge base based on the type or the attribute. Way.
Wherein the step of extracting the entity name from the input sentence comprises:
Analyzing the input sentence based on at least one of a part of speech tagger, a parser, a triple extractor, and a speech classifier to extract part of speech information of each word constituting the input sentence, And extracting relationship information between the first and second information.
Wherein the step of extracting the entity name from the input sentence comprises:
Extracting a word representing at least one of a name, a place name, an institution name, an object name, and a time among the words constituting the input sentence based on the part of speech information of each word constituting the input sentence and the relation information between the words, Lt; RTI ID = 0.0 > 1, < / RTI >
The knowledge associated with the input sentence,
Calculating an association score for each of the plurality of knowledge based on the semantic similarity degree with the entity name extracted from the input sentence and the personal information and interest information of the user who has input the input sentence, ≪ / RTI > is determined among a plurality of knowledge.
The system response candidate, which is extracted in advance,
Wherein a response template corresponding to the intention of the input sentence is selected from a plurality of response templates stored in a pre-established response candidate database.
Wherein generating a system response for the input statement comprises:
Generating a system response for the input sentence by replacing the selected response template with words comprising the input sentence and knowledge selected from the pre-built knowledge base.
An object name extracting unit for extracting a named entity from the received input sentence when an input sentence is received;
A knowledge extraction unit for extracting knowledge associated with the entity name from a pre-established knowledge base; And
And a system response generator for generating a system response to the input sentence by replacing the system response candidate extracted in advance so as to reflect the knowledge extracted from the knowledge base constructed in advance,
Wherein the knowledge base stores each knowledge identified by the entity name in a triple-type structure by linking each knowledge based on a type to which each knowledge belongs or an attribute of each knowledge,
Wherein the knowledge associated with the entity name is knowledge related to the input sentence among a plurality of knowledge connected to knowledge having the same entity name as the entity name extracted from the input sentence in the knowledge base based on the type or the attribute. System response generator.
The object-
Analyzing the input sentence based on at least one of a part of speech tagger, a parser, a triple extractor, and a speech classifier to extract part of speech information of each word constituting the input sentence, And extracts relationship information between the plurality of apparatuses.
The object-
Extracting a word representing at least one of a name, a place name, an institution name, an object name, and a time among the words constituting the input sentence based on the part of speech information of each word constituting the input sentence and the relation information between the words, The system response generation device comprising:
The knowledge associated with the input sentence,
Calculating an association score for each of the plurality of knowledge based on the semantic similarity degree with the entity name extracted from the input sentence and the personal information and interest information of the user who has input the input sentence, Wherein the system response is determined from a plurality of knowledge.
The system response candidate, which is extracted in advance,
Wherein a response template corresponding to the intention of the input sentence is selected from among a plurality of response templates stored in a previously constructed response candidate database.
Wherein the system response generating unit comprises:
Wherein the system response generator generates a system response for the input sentence by replacing the selected response template with words comprising the input sentence and knowledge selected from the pre-built knowledge base.
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