CN106934042A - A kind of knowledge mapping represents model and its method - Google Patents

A kind of knowledge mapping represents model and its method Download PDF

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CN106934042A
CN106934042A CN201710155940.1A CN201710155940A CN106934042A CN 106934042 A CN106934042 A CN 106934042A CN 201710155940 A CN201710155940 A CN 201710155940A CN 106934042 A CN106934042 A CN 106934042A
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赵翔
谭真
方阳
曾维新
葛斌
肖卫东
唐九阳
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National University of Defense Technology
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Abstract

Model and its method are represented the invention discloses a kind of knowledge mapping, it is related to knowledge mapping presentation technology field, the expression model includes entity space module, majorized function module and model training module;The entity space is used for the representation space of presentation-entity feature, and it includes intrinsic state space and mimicry space;The majorized function is used to represent different entities distance after translation that it to include that distance is calculated and weight vectors;The model training module is used for features training and exports training result, and the training result is used to carry out knowledge mapping prediction and classification.Translation model of the present invention based on dynamic representation space, one dynamic representation space is set to each relation, solve the problems, such as to represent that model cannot be distinguished by different relation spaces in the prior art, there is provided more fully reliable method for expressing, and the efficiency that the complexity of model improves algorithm is reduced, preferable effect is achieved in actual applications.

Description

Knowledge graph representation model and method thereof
Technical Field
The invention relates to the technical field of knowledge graph representation, in particular to a knowledge graph representation model and a method thereof.
Background
The existing knowledge graph representation methods around the world mainly focus on utilizing artificially constructed features and features represented based on an RDF framework. These feature representation methods have problems of low efficiency, complex algorithm, and the like in knowledge representation. In recent years, a series of knowledge representation methods are proposed by using a deep learning method, but the current training knowledge representation method has the problems of higher model complexity or lower training efficiency.
In addition, representative work of a knowledge graph representation method at home and abroad mainly comprises TransE (embedded model based on translation) [1]]TransH (Hyperplanar-based Embedded model) [2]]TransR (Embedded model based on entity relationship space) [3]CTRANsR (Embedded model based on clustering and entity relationship space) [3]And TransD (Embedded model based on dynamic mapping matrix) [4]The methods are collectively referred to as translation-based knowledge representation models. Based on the translation model, for each triplet (h, r, t), the relation r is a translation operation from the head entity vector h to the tail entity vector t, and accordingly, Bordes et al first proposed a TransE (embedded model based on translation) knowledge representation method, which measures semantic similarity between calculated entities by the offset in Euclidean distance, and is a simple and basic knowledge representation methodr(h,t)=||h+r-t||2Wherein | | h + r-t | | non-woven phosphor2Is the norm of order 2 of h + r-t, the euclidean distance. The TransH (embedded model based on hyperplane) method establishes a relation-oriented hyperplane which is composed of a normal vector nrAnd a translation vector r, the head entity vector h and the tail entity vector t are firstly projected to a hyperplane of the relation to obtain a vector h=h-nr ThnrAnd t=t-nr Thnr. thus, the optimization goal of TransH (Hyperplanar-based Embedded model) becomes h+r=tWith the corresponding score function modified to fr(h,t)=||h+r-t||2. TransR (Embedded model based on entity relationship space) and CTRANsR (Embedded model based on clustering and entity relationship space) are expected to build a mapping matrix MrAnd a vector r for representing each relation r, specifically, a head entity vector h and a tail entity vector t are mapped to the hierarchy of the relation vector r through a matrix by TransR (embedded model based on entity relation space), and M is obtainedrh+r=Mrt, namely the optimization target of the transR (embedded model based on the entity relationship space), the TransD (embedded model based on the dynamic mapping matrix) replaces the multiplication operation of the matrix and the vector in the transR (embedded model based on the entity relationship space) by the vector operation, and the algorithm efficiency is improved.
In practical application, TransE (embedded model based on translation) [1] achieves better prediction effect. In TransE (a translation-based embedded model), for each triplet (h, r, t), the head entity vector h, the tail entity vector t, and the relationship r are represented as n-dimensional vectors h (t) and r. The embedded vector t is approximately equal to the embedded h plus the embedded r, i.e. h + r ≈ t, and the TransE (translation-based embedded model) can well handle one-to-one relationships, but has an obvious disadvantage in handling complex relationships such as one-to-N, N-to-one, and N-to-N, and particularly, in the process of handling complex relationships, different entities use the same vector, which is not practical. TransH (hyperplane-based embedded model) [2] solves the problem of complex relationships by a hyperplane mapping rule that maps head entity vectors h and tail entity vectors t to relationship-specific hyperplanes. But entities and relationships are two completely different concepts and therefore it is not correct to place them in the same vector space. TransR (Embedded model based on entity relationship space)/CTRANsR (Embedded model based on clustering and entity relationship space) [3] and TransD (Embedded model based on dynamic mapping matrix) [4] propose two novel models that put entities and relationships in different vector spaces, for example: entity space and multiple relation space, TransR (embedded model based on entity relation space) sets a mapping matrix Mr for each relation r, and then the entity is mapped into the relation space by using Mr. In the relationship space, the entity vector mapped by Mr and the relationship vector r can construct a gold triple, which is described as Mrh + r ≈ Mrt. As an extension to TransR (Embedded model based on entity relationship space), CTRANsR (Embedded model based on clustering and entity relationship space) uses a clustering algorithm to segment the initial results of TransE (Embedded model based on translation), dividing each relationship r into several sub-relationships rs. To some extent, replacing r with rs solves the ambiguity problem for each relationship. TransD (embedded model based on dynamic mapping matrix) constructs a dynamic mapping matrix for each entity-relationship pair using two vectors ep and hp. However, the algorithm complexity of transR (embedded model based on entity relationship space)/CTRANsR (embedded model based on clustering and entity relationship space) is high, and the method cannot be applied in practice.
【1】Bordes A,Usunier N,Garcia-Duran A,et al.Translating embeddings formodeling multi-relational data[C]//Proc of NIPS.Cambridge,MA:MIT Press,2013:2787–2795
【2】Wang Zhen,Zhang Jianwen,Feng Jianlin,et al.Knowledge graphembedding by translating on hyperplanes[C]//Proc of AAAI.Menlo Park,CA:AAAI,2014:1112–1119
【3】Lin Yankai,Liu Zhiyuan,Sun Maosong,et al.Learning entity andrelation embeddings for knowledge graph completion[C]//Proc of AAAI.MenloPark,CA:AAAI,2015
【4】Ji Guoliang,He Shizhu,Xu Liheng,et al.Knowledge graph embeddingvia dynamic mapping matrix[C]//Proc of ACL.Stroudsburg PA:ACL,2045:687–696
Disclosure of Invention
The invention aims to provide a knowledge graph representation model and a method thereof, which can improve the representation capability of a knowledge graph and have important functions on completion and verification of the knowledge graph.
In order to achieve the purpose of the present invention, a first technical solution of the present invention is specifically as follows:
a knowledge spectrogram representation model comprises an entity space module, an optimization function module and a model training module;
the entity space module is used for representing a representation space of entity features, and comprises an eigen state space and a mimicry state space;
the optimization function module is used for representing the distance of different entities after translation, and comprises distance calculation and weight vectors;
the model training module is used for feature training and outputting a training result, and the training result is used for predicting and classifying the knowledge graph.
The second technical scheme of the invention is as follows:
a method of constructing the knowledge spectrogram representation model, the method comprising the steps of:
1) an entity space construction process, which adopts two vectors to represent an entity and a relation, wherein the two vectors comprise an eigen state vector and a mimicry vector, the eigen state vector is used for describing an entity relation eigen state, the mimicry vector is used for describing an entity relation mimicry, the mimicry vector forms a mimicry matrix, and the mimicry vector and the eigen state vector jointly form a feature vector of an entity space;
2) the optimization function process comprises the steps of calculating a distance formula between the translated head entity and the translated tail entity, and expressing weights of different dimensions by adopting weight vectors so as to achieve the purpose of optimizing the distance calculation formula;
3) a model training process that includes dynamic training of weight vectors and setting of parameters that prevent overfitting.
The third technical scheme of the invention is as follows:
the implementation method of the knowledge spectrogram representation model further comprises a data acquisition module, a preprocessing module, a feature extraction module, a training module, a knowledge spectrogram completion module and a classification module, and specifically comprises the following steps:
1) extracting data in the existing knowledge map by using a data acquisition module, performing distributed acquisition on knowledge existing in the Internet by using a distributed crawler system, and storing the knowledge in a distributed map database;
2) the method comprises the steps that a preprocessing module is used for carrying out structuralized processing on extracted data, and the preprocessing module is used for filtering the collected data and mainly comprises three parts, namely, entity relation duplicate removal, filtering entity relations which do not accord with description specifications and filtering entity relations in which illegal characters exist;
3) performing feature extraction on the data after the structured processing by using a feature extraction module, extracting entities, relations and attributes contained in the knowledge graph, describing the entities, relations and attributes in a triple form, and training the extracted features by using a training module;
4) and predicting and classifying the knowledge graph through the knowledge graph complementing module and the classifying module by using the trained result, wherein the knowledge graph complementing module and the classifying module test the trained representation model to verify the effectiveness of the model, and the recommendation of missing entities or relations in the knowledge graph and the judgment of the correctness of the existing triples are realized.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention sets a dynamic representation space for each relation based on the translation model of the dynamic representation space, solves the problem that the representation model can not distinguish different relation spaces in the prior art, provides a more comprehensive and reliable representation method, reduces the complexity of the model, improves the efficiency of the algorithm, and achieves better effect in practical application.
2. The invention provides a novel TransDR model (an embedded model based on a dynamic relation space), which constructs a dynamic relation space for each relation and provides a self-adaptive relation weight for each relation vector space; TransDR (an embedded model based on dynamic relationship space) can reduce noise from other relationships and improve the discrimination between different relationships.
Drawings
FIG. 1 is a schematic diagram of the composition and structure of a knowledge spectrogram representation model in the present invention.
Fig. 2 is an explanatory diagram of the basic idea of the TransDR model in the present invention.
FIG. 3 is a flow chart of entity space construction of a knowledge graph representation model in the present invention.
FIG. 4 is a flow chart of the optimization function construction of the knowledge graph representation model in the present invention.
FIG. 5 is a flow chart of the knowledge graph representation model training of the present invention.
FIG. 6 is a flow chart of the knowledge graph representation model operation of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The embodiment of the invention relates to a knowledge graph representation model and a method thereof, and the knowledge graph representation model comprises a data acquisition module, a preprocessing module, a feature extraction module, a knowledge graph completion module and a classification module, as shown in fig. 1.
The data acquisition module acquires knowledge existing in the Internet in a distributed manner by using a distributed crawler system and stores the knowledge in a distributed graph database; the preprocessing module filters the acquired data and mainly comprises three parts, namely, entity relationship duplication removal, entity relationship filtering, and entity relationship filtering, wherein the entity relationship filtering is not in accordance with the description specification, and illegal characters exist; the characteristic extraction module is used for training the extracted entity through a knowledge graph representation model; the knowledge graph complementing module and the classification module test the trained representation model, and the effectiveness of the model is verified.
The training module is a knowledge graph representation model, and the establishment process is as follows:
definition G is a triplet (h, r, t), where h represents the head entity, r represents the relationship, t represents the tail entity, and the bold font word h, r, t is the embedded representation of (h, r, t).
h=(h1,h2,...,hi,...,hn);
r=(r1,r2,...,ri,...,rn);
t=(t1,t2,...,ti,...,tn);
hi,ri,tiThe ith feature is h, r, t, respectively, n is the length of the feature, Δ represents the correct triplet set, Δ ' represents the incorrect triplet set, so (h, r, t) ∈ Δ represents that the triplet is correct, (h ', r ', t ') ∈ Δ ' represents that the triplet is incorrect, WrRepresenting an embedded representation of the relation weights, Wr=(wr1,wr2,...,wri,...,wrn);
The construction of the knowledge graph representation model specifically comprises entity space construction, optimization function and model training.
Solid space construction
Since the distribution of potential features of the knowledge-graph in different dimensions is not uniform, equal weights cannot be set for each dimension. The invention thus proposes a more flexible model, namely the TransDR (Embedded model based on dynamic relational space), which takes into account different types of relational spaces to avoid uneven distribution of different dimensions. As shown in fig. 2, the nsdr (embedded model based on dynamic relationship space) defines two vectors for each entity h (t), three vectors for each relationship r, a first vector of h (t) and a first vector of r represent natural features, a second vector of h (t) and a second vector of r represent extrinsic features used to construct the mapping matrix, and a third vector of r represents the relationship space weight in each dimension. Entities are randomly unordered in entity space, but after being translated into relationship space, the entities become ordered. Although it is used for
i=hi⊥+r-ti⊥WhereiniThe distance between the correct triples is represented,indicates the distance between the correct triplets, but r1(r2) The space can effectively identify the wrong tail entity and the correct tail entity, as shown in fig. 2 in particular.
The invention uses two vectors to represent entities and relationships, the first vector describing the eigenstates of the entity relationships, the other vector describing the mimicry of the entity relationships, six vectors he,hm,re,rm,te,tmA triplet (h, r, t) is represented, where the subscripts e and m denote the eigenstates and mimicry, the true state of an entity being composed of both mimicry and eigenstates.
Wherein h ise,hm,re,rm,te,tm∈Gm
RmRepresenting an M-dimensional entity relationship space, for each triplet (h, r, t), the invention defines two mimicry matrices Mh、MtRepresenting head and tail entity mimicry spaces, respectively, for Mh、MtIs defined as follows:
Mh=rmhm T(1)
Mt=rmtm T(2)
the symmetric mimicry matrix is constructed from a mimicry vector of entities and relationships, so for each triplet (h, r, t), h and t have a unique mimicry matrix.
In fact, the true state of an entity is composed of both mimicry and eigenstates, so the present invention defines the true vector as follows:
h=Mhhe+he(3)
t=Mtte+te(4)
the process of constructing the solid-space model is specifically shown in fig. 3.
Optimization function
Scoring function f for a gold tripler(h, t) should be lower and higher for an incorrect gold triplet, denoted L2For norm as an example, the conventional scoring function is:
to solve the problem that the traditional scoring function calculates the Euclidean Distance (ED) between h + r and t, which considers the uniform distribution of each feature dimension, but which cannot distinguish the trends of different relationship spaces, the invention uses a normalized euclidean distance (SED) instead of ED.
Wherein the function of SED is:
where X and X denote the feature vectors before and after normalization, respectively, and μ and σ are the expectation and standard deviation vectors, respectively. SED can eliminate the non-uniform distribution of features by normalization, so the distance between h + r and t is:
wherein σiIs the ith dimension characteristic of sigma, take Wr=1/σ2Book, bookThe invention proposes a new scoring function:
the optimization function construction flow is specifically shown in fig. 4.
Model training
To obtain a distinction between gold triples and incorrect triples, the present invention defines the following margin-based ranking loss function:
wherein,Δ and Δ' are the sets of positive and negative triplets, respectively, and γ is the distance between positive and negative samples. Since the original triple set contains only positive triples, negative triples have to be generated manually.
The invention constructs a negative triple set by using two strategies of random sampling and Bernoulli sampling.
The following constraints are considered in minimizing the loss L:
||h||≤1,||t||≤1
||Wr||=1 (7)
where equation (7) ensures that the relationship weight vector Wr is a constant, it is converted by means of soft constraints into the following unconstrained loss function:
where λ and η are two hyper-parameters that weight the importance of the soft constraint.
Training the penalty function using modified random gradient descent (ADADELTA), with constraints (5) and (6) missing in equation (8), and instead, constraints (5) and (6) are satisfied directly before each mini-lot is visited; to speed up convergence, the result of Trans E is used instead of he,te,reThe flow of the model training is specifically shown in fig. 5.
The working process of the knowledge graph representation model is shown in fig. 6, and the implementation method of the knowledge graph representation model comprises the following steps:
1) extracting data in the existing knowledge map by using a data acquisition module, performing distributed acquisition on knowledge existing in the Internet by using a distributed crawler system, and storing the knowledge in a distributed map database;
2) the method comprises the steps that a preprocessing module is used for carrying out structuralized processing on extracted data, and the preprocessing module is used for filtering the collected data and mainly comprises three parts, namely, entity relation duplicate removal, filtering entity relations which do not accord with description specifications and filtering entity relations in which illegal characters exist;
3) performing feature extraction on the data after the structured processing by using a feature extraction module, extracting entities, relations and attributes contained in the knowledge graph, describing the entities, relations and attributes in a triple form, and training the extracted features by using the knowledge graph representation model;
4) and predicting and classifying the knowledge graph through the knowledge graph complementing module and the classifying module by using the trained result, wherein the knowledge graph complementing module and the classifying module test the trained representation model to verify the effectiveness of the model, and the recommendation of missing entities or relations in the knowledge graph and the judgment of the correctness of the existing triples are realized.
The above embodiments only serve to explain the technical solution of the present invention, and the protection scope of the present invention is not limited to the implementation system and the specific implementation steps described in the above embodiments. Therefore, the technical solutions that the specific formulas and algorithms in the above embodiments are simply replaced, but the substantial contents are still consistent with the method of the present invention, and all the technical solutions are within the protection scope of the present invention.

Claims (3)

1. A knowledge spectrogram representation model is characterized by comprising an entity space module, an optimization function module and a model training module;
the entity space module is used for representing a representation space of entity features, and comprises an eigen state space and a mimicry state space;
the optimization function module is used for representing the distance of different entities after translation, and comprises distance calculation and weight vectors;
the model training module is used for feature training and outputting a training result, and the training result is used for predicting and classifying the knowledge graph.
2. A method of constructing a knowledge spectrogram representation model of claim 1, the method comprising:
1) an entity space construction process, which adopts two vectors to represent an entity and a relation, wherein the two vectors comprise an eigen state vector and a mimicry vector, the eigen state vector is used for describing an entity relation eigen state, the mimicry vector is used for describing an entity relation mimicry, the mimicry vector forms a mimicry matrix, and the mimicry vector and the eigen state vector jointly form a feature vector of an entity space;
2) the optimization function process comprises the steps of calculating a distance formula between the translated head entity and the translated tail entity, and endowing different dimensions of the head entity and the tail entity with different weights by adopting weight vectors so as to achieve the purpose of optimizing the distance calculation formula;
3) a model training process that includes dynamic training of weight vectors and setting of parameters that prevent overfitting.
3. The method for implementing a knowledge spectrogram representation model as defined in claim 1, further comprising a data acquisition module, a preprocessing module, a feature extraction module, a knowledge spectrogram completion module and a classification module, wherein the implementation method specifically comprises the following steps:
1) extracting data in the existing knowledge map by using a data acquisition module, performing distributed acquisition on knowledge existing in the Internet by using a distributed crawler system, and storing the knowledge in a distributed map database;
2) the method comprises the steps that a preprocessing module is used for carrying out structuralized processing on extracted data, and the preprocessing module is used for filtering the collected data and mainly comprises three parts, namely, entity relation duplicate removal, filtering entity relations which do not accord with description specifications and filtering entity relations in which illegal characters exist;
3) performing feature extraction on the data after the structured processing by using a feature extraction module, extracting entities, relations and attributes contained in the knowledge graph, describing the entities, relations and attributes in a triple form, and training the extracted features by using the knowledge graph representation model;
4) and predicting and classifying the knowledge graph through the knowledge graph complementing module and the classifying module by using the trained result, wherein the knowledge graph complementing module and the classifying module test the trained representation model to verify the effectiveness of the model, and the recommendation of missing entities or relations in the knowledge graph and the judgment of the correctness of the existing triples are realized.
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