{ "paper_id": "2020", "header": { "generated_with": "S2ORC 1.0.0", "date_generated": "2023-01-19T07:58:05.691229Z" }, "title": "A survey of embedding models of entities and relationships for knowledge graph completion", "authors": [ { "first": "Dat", "middle": [ "Quoc" ], "last": "Nguyen", "suffix": "", "affiliation": { "laboratory": "", "institution": "VinAI Research", "location": { "country": "Vietnam" } }, "email": "v.datnq9@vinai.io" } ], "year": "", "venue": null, "identifiers": {}, "abstract": "Knowledge graphs (KGs) of real-world facts about entities and their relationships are useful resources for a variety of natural language processing tasks. However, because knowledge graphs are typically incomplete, it is useful to perform knowledge graph completion or link prediction, i.e. predict whether a relationship not in the knowledge graph is likely to be true. This paper serves as a comprehensive survey of embedding models of entities and relationships for knowledge graph completion, summarizing up-to-date experimental results on standard benchmark datasets and pointing out potential future research directions.", "pdf_parse": { "paper_id": "2020", "_pdf_hash": "", "abstract": [ { "text": "Knowledge graphs (KGs) of real-world facts about entities and their relationships are useful resources for a variety of natural language processing tasks. However, because knowledge graphs are typically incomplete, it is useful to perform knowledge graph completion or link prediction, i.e. predict whether a relationship not in the knowledge graph is likely to be true. This paper serves as a comprehensive survey of embedding models of entities and relationships for knowledge graph completion, summarizing up-to-date experimental results on standard benchmark datasets and pointing out potential future research directions.", "cite_spans": [], "ref_spans": [], "eq_spans": [], "section": "Abstract", "sec_num": null } ], "body_text": [ { "text": "Let us revisit the classic Word2Vec example of a \"royal\" relationship between \"king\" and \"man\", and between \"queen\" and \"woman\". As illustrated in this example: v king \u2212 v man \u2248 v queen \u2212 v woman , word vectors learned from a large corpus can model relational similarities or linguistic regularities between pairs of words as translations in the projected vector space (Mikolov et al., 2013; Pennington et al., 2014) . Figure 1 shows another example of a relational similarity between word pairs of countries and capital cities:", "cite_spans": [ { "start": 369, "end": 391, "text": "(Mikolov et al., 2013;", "ref_id": "BIBREF54" }, { "start": 392, "end": 416, "text": "Pennington et al., 2014)", "ref_id": "BIBREF67" } ], "ref_spans": [ { "start": 419, "end": 427, "text": "Figure 1", "ref_id": "FIGREF0" } ], "eq_spans": [], "section": "Introduction", "sec_num": "1" }, { "text": "v Japan \u2212 v T okyo \u2248 v Germany \u2212 v Berlin v Germany \u2212 v Berlin \u2248 v P ortugal \u2212 v Lisbon", "cite_spans": [], "ref_spans": [], "eq_spans": [], "section": "Introduction", "sec_num": "1" }, { "text": "Assume that we consider the country and capital pairs in Figure 1 to be pairs of entities rather than word types. That is, we now represent country and capital entities by low-dimensional and dense vectors. The relational similarity between word pairs is presumably to capture a \"is capital of\" relationship between country and capital entities. Also, we represent this relationship by a translation vector v is capital of in the entity vector space. Thus, we expect:", "cite_spans": [], "ref_spans": [ { "start": 57, "end": 65, "text": "Figure 1", "ref_id": "FIGREF0" } ], "eq_spans": [], "section": "Introduction", "sec_num": "1" }, { "text": "v T okyo + v is capital of \u2212 v Japan \u2248 0 v Berlin + v is capital of \u2212 v Germany \u2248 0 v Lisbon + v is capital of \u2212 v P ortugal \u2248 0", "cite_spans": [], "ref_spans": [], "eq_spans": [], "section": "Introduction", "sec_num": "1" }, { "text": "This intuition inspired the TransE model-a well-known embedding model for KG completion or link prediction in KGs (Bordes et al., 2013) .", "cite_spans": [ { "start": 114, "end": 135, "text": "(Bordes et al., 2013)", "ref_id": "BIBREF8" } ], "ref_spans": [], "eq_spans": [], "section": "Introduction", "sec_num": "1" }, { "text": "Knowledge graphs are collections of real-world triples, where each triple or fact (h, r, t) in KGs represents some relation r between a head entity h and a tail entity t. KGs can thus be formalized as directed multi-relational graphs, where nodes correspond to entities and edges linking the nodes encode various kinds of relationships (Garc\u00eda-Dur\u00e1n et al., 2016; Nickel et al., 2016a) . Here entities are real-world things or objects such as persons, places, organizations, music tracks or movies. Each relation type defines a certain relationship between entities. For example, as illustrated in Figure 2 , the relation type \"child of\" relates person entities with each other, while the relation type \"born in\" relates person entities : An illustration of (incomplete) knowledge base, with 4 person entities, 2 place entities, 2 relation types and total 6 triple facts. This figure is drawn based on Weston and Bordes (2014) .", "cite_spans": [ { "start": 336, "end": 363, "text": "(Garc\u00eda-Dur\u00e1n et al., 2016;", "ref_id": "BIBREF29" }, { "start": 364, "end": 385, "text": "Nickel et al., 2016a)", "ref_id": "BIBREF64" }, { "start": 902, "end": 926, "text": "Weston and Bordes (2014)", "ref_id": "BIBREF94" } ], "ref_spans": [ { "start": 598, "end": 606, "text": "Figure 2", "ref_id": "FIGREF1" } ], "eq_spans": [], "section": "Introduction", "sec_num": "1" }, { "text": "with place entities. Several KG examples include the domain-specific KG GeneOntology and popular generic KGs of WordNet (Fellbaum, 1998) , YAGO (Suchanek et al., 2007) , Freebase (Bollacker et al., 2008) , NELL (Carlson et al., 2010) and DBpedia (Lehmann et al., 2015) as well as commercial KGs such as Google's Knowledge Graph, Microsoft's Satori and Facebook's Open Graph. Nowadays, KGs are used in a number of commercial applications including search engines such as Google, Microsoft's Bing and Facebook's Graph search. They also are useful resources for many natural language processing tasks such as question answering (Ferrucci, 2012; Fader et al., 2014) , word sense disambiguation (Navigli and Velardi, 2005; Agirre et al., 2013) , semantic parsing (Krishnamurthy and Mitchell, 2012; Berant et al., 2013) and co-reference resolution (Ponzetto and Strube, 2006; Dutta and Weikum, 2015) .", "cite_spans": [ { "start": 120, "end": 136, "text": "(Fellbaum, 1998)", "ref_id": "BIBREF24" }, { "start": 144, "end": 167, "text": "(Suchanek et al., 2007)", "ref_id": "BIBREF76" }, { "start": 179, "end": 203, "text": "(Bollacker et al., 2008)", "ref_id": "BIBREF5" }, { "start": 211, "end": 233, "text": "(Carlson et al., 2010)", "ref_id": "BIBREF11" }, { "start": 246, "end": 268, "text": "(Lehmann et al., 2015)", "ref_id": "BIBREF46" }, { "start": 625, "end": 641, "text": "(Ferrucci, 2012;", "ref_id": "BIBREF27" }, { "start": 642, "end": 661, "text": "Fader et al., 2014)", "ref_id": "BIBREF22" }, { "start": 690, "end": 717, "text": "(Navigli and Velardi, 2005;", "ref_id": "BIBREF57" }, { "start": 718, "end": 738, "text": "Agirre et al., 2013)", "ref_id": "BIBREF0" }, { "start": 758, "end": 792, "text": "(Krishnamurthy and Mitchell, 2012;", "ref_id": "BIBREF41" }, { "start": 793, "end": 813, "text": "Berant et al., 2013)", "ref_id": "BIBREF4" }, { "start": 842, "end": 869, "text": "(Ponzetto and Strube, 2006;", "ref_id": "BIBREF68" }, { "start": 870, "end": 893, "text": "Dutta and Weikum, 2015)", "ref_id": "BIBREF20" } ], "ref_spans": [], "eq_spans": [], "section": "Introduction", "sec_num": "1" }, { "text": "A main issue is that even very large KGs, such as Freebase and DBpedia, which contain billions of fact triples about the world, are still far from complete. In particular, in English DBpedia 2014, 60% of person entities miss a place of birth and 58% of the scientists do not have a fact about what they are known for (Krompa\u00df et al., 2015) . In Freebase, 71% of 3 million person entities miss a place of birth, 75% do not have a nationality while 94% have no facts about their parents (West et al., 2014) . So, in terms of a specific application, question answering systems based on incomplete KGs would not provide a correct answer given a correctly interpreted question. For example, given the incomplete KG in Figure 2 , it would be impossible to answer the question \"where was Jane born ?\", although the question is completely matched with existing entity and relation type information (i.e. \"Jane\" and \"born in\") in KG. Consequently, much work has been devoted towards knowledge graph completion to perform link prediction in KGs, which attempts to predict whether a relationship/triple not in the KG is likely to be true, i.e. to add new triples by leveraging existing triples in the KG (Lao and Cohen, 2010; Gardner et al., 2014; Garc\u00eda-Dur\u00e1n et al., 2016) . For example, we would like to predict the missing tail entity in the incomplete triple (Jane, born in, ?) or predict whether the triple (Jane, born in, Miami) is correct or not.", "cite_spans": [ { "start": 317, "end": 339, "text": "(Krompa\u00df et al., 2015)", "ref_id": "BIBREF42" }, { "start": 485, "end": 504, "text": "(West et al., 2014)", "ref_id": "BIBREF93" }, { "start": 1193, "end": 1214, "text": "(Lao and Cohen, 2010;", "ref_id": "BIBREF44" }, { "start": 1215, "end": 1236, "text": "Gardner et al., 2014;", "ref_id": "BIBREF31" }, { "start": 1237, "end": 1263, "text": "Garc\u00eda-Dur\u00e1n et al., 2016)", "ref_id": "BIBREF29" } ], "ref_spans": [ { "start": 713, "end": 721, "text": "Figure 2", "ref_id": "FIGREF1" } ], "eq_spans": [], "section": "Introduction", "sec_num": "1" }, { "text": "Embedding models for KG completion have been proven to give state-of-the-art link prediction performances, in which entities are represented by latent feature vectors while relation types are represented by latent feature vectors and/or matrices and/or third-order tensors (Bordes et al., 2013; Socher et al., 2013) . This paper: (1) surveys the embedding models for KG completion, then (2) summarizes up-todate experimental results on the standard evaluation task of entity prediction-which is also referred to as the link prediction task (Bordes et al., 2013) , and (3) points out potential future research directions.", "cite_spans": [ { "start": 273, "end": 294, "text": "(Bordes et al., 2013;", "ref_id": "BIBREF8" }, { "start": 295, "end": 315, "text": "Socher et al., 2013)", "ref_id": "BIBREF75" }, { "start": 540, "end": 561, "text": "(Bordes et al., 2013)", "ref_id": "BIBREF8" } ], "ref_spans": [], "eq_spans": [], "section": "Introduction", "sec_num": "1" }, { "text": "Let E denote the set of entities and R the set of relation types. Denote by G the knowledge graph consisting of a set of correct triples (h, r, t), such that h, t \u2208 E and r \u2208 R. For each triple (h, r, t), the embedding models define a score function f (h, r, t) of its plausibility. Their goal here is to:", "cite_spans": [], "ref_spans": [], "eq_spans": [], "section": "A General Approach of Embedding Models for KG Completion", "sec_num": "2" }, { "text": "Choose f such that the score f (h, r, t) of a correct triple (h, r, t) is higher than the score f (h , r , t )", "cite_spans": [], "ref_spans": [], "eq_spans": [], "section": "A General Approach of Embedding Models for KG Completion", "sec_num": "2" }, { "text": "of an incorrect triple (h , r , t ).", "cite_spans": [], "ref_spans": [], "eq_spans": [], "section": "A General Approach of Embedding Models for KG Completion", "sec_num": "2" }, { "text": "For example, TransE defines a score function of", "cite_spans": [], "ref_spans": [], "eq_spans": [], "section": "A General Approach of Embedding Models for KG Completion", "sec_num": "2" }, { "text": "f TransE (h, r, t) = \u2212 v h + v r \u2212 v t ,", "cite_spans": [], "ref_spans": [], "eq_spans": [], "section": "A General Approach of Embedding Models for KG Completion", "sec_num": "2" }, { "text": "where h, r and t are represented by low dimensional vectors v h , v r and v t , respectively. As (Tokyo, is capital of, Japan) is a correct triple, while (Tokyo, is capital of, Portugal) and (Lisbon, is capital of, Japan) are incorrect ones, we would have: Table 1 in Section 3 summarizes different prominent score functions f (h, r, t).", "cite_spans": [], "ref_spans": [ { "start": 257, "end": 264, "text": "Table 1", "ref_id": "TABREF0" } ], "eq_spans": [], "section": "A General Approach of Embedding Models for KG Completion", "sec_num": "2" }, { "text": "\u2212 v T okyo + v is capital of \u2212 v Japan > \u2212 v T okyo + v is capital of \u2212 v P ortugal , and \u2212 v T okyo + v is capital of \u2212 v Japan > \u2212 v Lisbon + v is capital of \u2212 v Japan .", "cite_spans": [], "ref_spans": [], "eq_spans": [], "section": "A General Approach of Embedding Models for KG Completion", "sec_num": "2" }, { "text": "To learn model parameters (i.e. entity vectors, relation vectors or matrices), the embedding models minimize an objective loss L. A conventional objective loss is the margin-based pairwise ranking loss (Bordes et al., 2013) :", "cite_spans": [ { "start": 202, "end": 223, "text": "(Bordes et al., 2013)", "ref_id": "BIBREF8" } ], "ref_spans": [], "eq_spans": [], "section": "A General Approach of Embedding Models for KG Completion", "sec_num": "2" }, { "text": "L Margin = (h,r,t)\u2208G (h ,r,t )\u2208G (h,r,t) [\u03b3 \u2212 f (h, r, t) + f (h , r, t )] +", "cite_spans": [], "ref_spans": [], "eq_spans": [], "section": "A General Approach of Embedding Models for KG Completion", "sec_num": "2" }, { "text": "where [x] + = max(0, x); \u03b3 is the margin hyper-parameter; and G (h,r,t) is the set of incorrect triples generated by corrupting the correct triple (h, r, t) \u2208 G.", "cite_spans": [], "ref_spans": [], "eq_spans": [], "section": "A General Approach of Embedding Models for KG Completion", "sec_num": "2" }, { "text": "Also, the negative log-likelihood (NLL) of softmax regression (Toutanova and Chen, 2015) and the NLL of logistic regression (Trouillon et al., 2016) are commonly used in recent KG completion research: 1", "cite_spans": [ { "start": 62, "end": 88, "text": "(Toutanova and Chen, 2015)", "ref_id": "BIBREF81" }, { "start": 124, "end": 148, "text": "(Trouillon et al., 2016)", "ref_id": "BIBREF83" } ], "ref_spans": [], "eq_spans": [], "section": "A General Approach of Embedding Models for KG Completion", "sec_num": "2" }, { "text": "L Softmax = \u2212 (h,r,t)\u2208G exp f (h, r, t) t \u2208 E\\{t} exp f (h, r, t ) + exp f (h, r, t) h \u2208 E\\{h} exp f (h , r, t) L Logistic = (h,r,t)\u2208{G\u222aG } log 1 + exp \u2212I (h,r,t) \u2022 f (h, r, t) with: I (h,r,t) = 1 for (h, r, t) \u2208 G \u22121 for (h, r, t) \u2208 G", "cite_spans": [], "ref_spans": [], "eq_spans": [], "section": "A General Approach of Embedding Models for KG Completion", "sec_num": "2" }, { "text": "To corrupt the head or tail entities, a common strategy is to uniformly replace the entities when sampling incorrect triples (Bordes et al., 2013) , however it results in many false negative labels (Wang et al., 2014) . Domain sampling (Krompa\u00df et al., 2015; Xie et al., 2017) generates corrupted triples by sampling entities from the same domain or from the set of relation-dependent entities. The \"Bernoulli\" trick (Wang et al., 2014 ) is widely used to set different probabilities for generating head or tail entities: For each relation type r, we calculate the averaged number a r,1 of heads h for a pair (r, t) and the averaged number a r,2 of tails t for a pair (h, r). We then define a Bernoulli distribution with success probability \u03bb r = a r,1 a r,1 + a r,2", "cite_spans": [ { "start": 125, "end": 146, "text": "(Bordes et al., 2013)", "ref_id": "BIBREF8" }, { "start": 198, "end": 217, "text": "(Wang et al., 2014)", "ref_id": "BIBREF89" }, { "start": 236, "end": 258, "text": "(Krompa\u00df et al., 2015;", "ref_id": "BIBREF42" }, { "start": 259, "end": 276, "text": "Xie et al., 2017)", "ref_id": "BIBREF97" }, { "start": 417, "end": 435, "text": "(Wang et al., 2014", "ref_id": "BIBREF89" } ], "ref_spans": [], "eq_spans": [], "section": "A General Approach of Embedding Models for KG Completion", "sec_num": "2" }, { "text": "for sampling: given a correct triple (h, r, t), we corrupt this triple by replacing head entity with probability \u03bb r while replacing the tail entity with probability (1 \u2212 \u03bb r ).", "cite_spans": [], "ref_spans": [], "eq_spans": [], "section": "A General Approach of Embedding Models for KG Completion", "sec_num": "2" }, { "text": "Recently, Cai and Wang (2018) and Sun et al. (2019) proposed adversarial learning-based strategies for sampling incorrect triples. However, they did not provide a comparison between the adversarial learning-based strategies and the \"Bernoulli\" trick.", "cite_spans": [ { "start": 10, "end": 29, "text": "Cai and Wang (2018)", "ref_id": "BIBREF9" }, { "start": 34, "end": 51, "text": "Sun et al. (2019)", "ref_id": "BIBREF77" } ], "ref_spans": [], "eq_spans": [], "section": "A General Approach of Embedding Models for KG Completion", "sec_num": "2" }, { "text": "Translation-based models: The Unstructured model assumes that the head and tail entity vectors are similar. As the Unstructured model does not take the relationship into account, it cannot distinguish different relation types. The Structured Embedding (SE) model (Bordes et al., 2011) assumes that the head and tail entities are similar only in a relation-dependent subspace, where each", "cite_spans": [ { "start": 263, "end": 284, "text": "(Bordes et al., 2011)", "ref_id": "BIBREF6" } ], "ref_spans": [], "eq_spans": [], "section": "Triple-based Embedding Models", "sec_num": "3.1" }, { "text": "Model Score function f (h, r, t) Translation Unstructured \u2212 v h \u2212 v t 1/2 SE \u2212 W r,1 v h \u2212 W r,2 v t 1/2 where W r,1 , W r,2 \u2208 R k\u00d7k TransE \u2212 v h + v r \u2212 v t 1/2 where v r \u2208 R k TransH \u2212 (I \u2212 r p r p )v h + v r \u2212 (I \u2212 r p r p )v t 1/2 where r p , v r \u2208 R k , I denotes an identity matrix size k \u00d7 k TransR \u2212 W r v h + v r \u2212 W r v t 1/2 where W r \u2208 R n\u00d7k , v r \u2208 R n STransE \u2212 W r,1 v h + v r \u2212 W r,2 v t 1/2 where W r,1 , W r,2 \u2208 R k\u00d7k , v r \u2208 R k TranSparse \u2212 W r,1 (\u03b8 r,1 )v h + v r \u2212 W r,2 (\u03b8 r,2 )v t 1/2 where W r,1 , W r,2 \u2208 R n\u00d7k ; \u03b8 r,1 , \u03b8 r,2 \u2208 R ; v r \u2208 R n TransD \u2212 (I + r p h p )v h + v r \u2212 (I + r p t p )v t 1/2 where r p , v r , h p , t p \u2208 R k lppTransD \u2212 (I + r p,1 h p )v h + v r \u2212 (I + r p,2 t p )v t 1/2 where r p,1 , r p,2 , v r , h p , t p \u2208 R k Bilinear & Tensor Bilinear v h W r v t where W r \u2208 R k\u00d7k DISTMULT v h W r v t where W r is a diagonal matrix \u2208 R k\u00d7k SimplE 1 2 v h,1 W r v t,2 + v t,1 W r \u22121 v h,2 where v h,1 , v h,2 , v t,1 , v t,2 \u2208 R k ; W r and W r \u22121 are diagonal matrices \u2208 R k\u00d7k SME(bilinear) v h (M 1 \u00d7 3 v r ) (M 2 \u00d7 3 v r )v t where v r \u2208 R k ; M 1 , M 2 \u2208 R n\u00d7k\u00d7k TuckER M \u00d7 1 v h \u00d7 2 v r \u00d7 3 v t where v r \u2208 R n , M \u2208 R k\u00d7n\u00d7k ; \u00d7 d denotes the tensor product along the d-th mode HolE sigmoid(v t (v h v r )) where denotes circular correlation Neural network NTN v r tanh(v h M r v t + W r,1 v h + W r,2 v t + b r ) where v r , b r \u2208 R n ; M r \u2208 R k\u00d7k\u00d7n ; W r,1 , W r,2 \u2208 R n\u00d7k ER-MLP sigmoid(w tanh(W concat(v h , v r , v t ))) ConvE v t ReLU (W vec (ReLU (concat(v h , v r ) * \u2126))) ConvKB w concat (ReLU ([v h , v r , v t ] * \u2126))", "cite_spans": [], "ref_spans": [], "eq_spans": [], "section": "Triple-based Embedding Models", "sec_num": "3.1" }, { "text": "Complex vector", "cite_spans": [], "ref_spans": [], "eq_spans": [], "section": "Triple-based Embedding Models", "sec_num": "3.1" }, { "text": "Re c h C r\u0109t where Re(c) denotes the real part of the complex value c \u2208 C", "cite_spans": [], "ref_spans": [], "eq_spans": [], "section": "ComplEx", "sec_num": null }, { "text": "c h , c t \u2208 C k ; C r \u2208 C k\u00d7k is a diagonal matrix ;\u0109 t is the conjugate of c t RotatE \u2212 c h \u2022 c r \u2212 c t 1/2 where c h , c r , c t \u2208 C k ; \u2022 denotes the element-wise product QuatE q h \u2297 q r |q r | \u2022 q t where q h , q r , q t \u2208 H k ; \u2297 and", "cite_spans": [], "ref_spans": [], "eq_spans": [], "section": "ComplEx", "sec_num": null }, { "text": "\u2022 denote Hamilton and quaternion inner products, respectively The score functions f (h, r, t) of several prominent embedding models for KG completion. In these models, the entities h and t are represented by vectors v h and v t \u2208 R k , respectively. 1/2 denotes either the L 1 -norm or the squared L 2 -norm. In ConvE, v h and v r denote a 2D reshaping of v h and v r , respectively. In both ConvE and ConvKB models, * and \u2126 denote a convolution operator and a set of filters, respectively. relation is represented by two different matrices. TransE (Bordes et al., 2013) is inspired by models such as the Word2Vec Skip-gram model (Mikolov et al., 2013) where relationships between words often correspond to translations in latent feature space. In particular, TransE learns low-dimensional and dense vectors for every entity and relation type, so that each relation type corresponds to a translation vector operating on the vectors representing the entities, i.e. v h + v r \u2248 v t for each fact triple (h, r, t). TransE thus is suitable for 1-to-1 relationships, such as \"is capital of\", where a head entity is linked to at most one tail entity given a relation type. Because of using only one translation vector to represent each relation type, TransE is not well-suited for Many-to-1, 1-to-Many and Many-to-Many relationships, 2 such as for relation types \"born in\", \"place of birth\" and \"research fields.\" For example in Figure 2 , using one vector representing the relation type \"born in\" cannot capture both the translating direction from \"Patti\" to \"Miami\" and its inverse direction from \"Mom\" to \"Austin.\" To overcome those issues of TransE, TransH (Wang et al., 2014) associates each relation with a relation-specific hyperplane and uses a projection vector to project entity vectors onto that hyperplane. TransD and TransR/CTransR (Lin et al., 2015b) extend TransH by using two projection vectors and a matrix to project entity vectors into a relation-specific space, respectively. Similar to TransR, TransR-FT (Feng et al., 2016a) also uses a matrix to project head and tail entity vectors. TEKE H extends TransH to incorporate rich context information in an external text corpus. lppTransD (Yoon et al., 2016) extends TransD to additionally use two projection vectors for representing each relation. STransE (Nguyen et al., 2016b) and TranSparse (Ji et al., 2016) can be viewed as direct extensions of TransR, where head and tail entities are associated with their own projection matrices. Unlike STransE, TranSparse uses adaptive sparse matrices, whose sparse degrees are defined based on the number of entities linked by relations. TranSparse-DT is an extension of TranSparse with a dynamic translation. ITransF (Xie et al., 2017) can be considered as a generalization of STransE, which allows the sharing of statistic regularities between relation projection matrices and alleviates data sparsity issue. Furthermore, TorusE (Ebisu and Ichise, 2018) embeds entities and relations on a torus to handle TransE's regularization problem which forces entity embeddings to be on a sphere in the embedding vector space.", "cite_spans": [ { "start": 549, "end": 570, "text": "(Bordes et al., 2013)", "ref_id": "BIBREF8" }, { "start": 630, "end": 652, "text": "(Mikolov et al., 2013)", "ref_id": "BIBREF54" }, { "start": 1655, "end": 1674, "text": "(Wang et al., 2014)", "ref_id": "BIBREF89" }, { "start": 1839, "end": 1858, "text": "(Lin et al., 2015b)", "ref_id": "BIBREF49" }, { "start": 2019, "end": 2039, "text": "(Feng et al., 2016a)", "ref_id": "BIBREF25" }, { "start": 2200, "end": 2219, "text": "(Yoon et al., 2016)", "ref_id": "BIBREF103" }, { "start": 2310, "end": 2340, "text": "STransE (Nguyen et al., 2016b)", "ref_id": null }, { "start": 2356, "end": 2373, "text": "(Ji et al., 2016)", "ref_id": "BIBREF38" }, { "start": 2724, "end": 2742, "text": "(Xie et al., 2017)", "ref_id": "BIBREF97" } ], "ref_spans": [ { "start": 1423, "end": 1431, "text": "Figure 2", "ref_id": "FIGREF1" } ], "eq_spans": [], "section": "ComplEx", "sec_num": null }, { "text": "Path TransE-COMP \u2212 v h + v r1 + v r2 + ... + v rm \u2212 v t 1/2 where v r1 , v r2 , ..., v rm \u2208 R k Bilinear-COMP v h W r1 W r2 ...W rm v t where W r1 , W r2 , ..., W rm \u2208 R k\u00d7k", "cite_spans": [], "ref_spans": [], "eq_spans": [], "section": "ComplEx", "sec_num": null }, { "text": "Bilinear-& Tensor-based models: DISTMULT (Yang et al., 2015) is based on the Bilinear model (Nickel et al., 2011; Jenatton et al., 2012) where each relation is represented by a diagonal matrix rather than a full matrix. SimplE (Kazemi and Poole, 2018) extends DISTMULT to allow two embeddings of each entity to be learned dependently. Such quadratic forms are also used to model entities and relations in KG2E , TATEC (Garc\u00eda-Dur\u00e1n et al., 2016), TransG (Xiao et al., 2016) , RSTE (Tay et al., 2017) , ANALOGY and Dihedral (Xu and Li, 2019) . SME-bilinear is proposed to first separately combine entity-relation pairs (h, r) and (r, t) and then semantically match these combinations, using tensor product. HolE (Nickel et al., 2016b) uses circular correlationa compositional operator-which can be interpreted as a compression of the tensor product. In addition, TuckER (Balazevic et al., 2019 ) is a linear model based on the Tucker tensor decomposition of the binary tensor representation of KG triples.", "cite_spans": [ { "start": 41, "end": 60, "text": "(Yang et al., 2015)", "ref_id": "BIBREF100" }, { "start": 92, "end": 113, "text": "(Nickel et al., 2011;", "ref_id": "BIBREF63" }, { "start": 114, "end": 136, "text": "Jenatton et al., 2012)", "ref_id": "BIBREF36" }, { "start": 454, "end": 473, "text": "(Xiao et al., 2016)", "ref_id": "BIBREF95" }, { "start": 481, "end": 499, "text": "(Tay et al., 2017)", "ref_id": "BIBREF80" }, { "start": 523, "end": 540, "text": "(Xu and Li, 2019)", "ref_id": "BIBREF99" }, { "start": 711, "end": 733, "text": "(Nickel et al., 2016b)", "ref_id": "BIBREF65" }, { "start": 869, "end": 892, "text": "(Balazevic et al., 2019", "ref_id": "BIBREF3" } ], "ref_spans": [], "eq_spans": [], "section": "ComplEx", "sec_num": null }, { "text": "Neural network-based models: The neural tensor network (NTN) model (Socher et al., 2013) also uses a bilinear tensor operator to represent each relation while ProjE (Shi and Weninger, 2017) can be viewed as simplified versions of NTN. The ER-MLP model (Dong et al., 2014) represents each triple by a vector obtained from concatenating head, relation and tail embeddings, then feeds this vector into a single-layer MLP with one-node output layer. ConvE (Dettmers et al., 2018) and ConvKB (Nguyen et al., 2018) are based on convolutional neural networks. ConvE uses a convolution layer directly over 2D reshaping of head-entity and relation embeddings, while ConvKB applies a convolution layer over the embedding triples (here each triple (h, r, t) is represented as a 3-column matrix where each column vector represents a triple element). HypER (Bala\u017eevi\u0107 et al., 2019) simplifies ConvE by using a hypernetwork to produce 1D convolutional filters for each relation, then extracts relation-specific features from head entity embeddings. Conv-TransE (Shang et al., 2019) extends ConvE to keep the translational characteristic between entities and relations. InteractE (Vashishth et al., 2020) uses a circular convolution operator and a checkered reshaping function instead of the standard convolution operator and 2D stack reshaping function in ConvE. The CapsE model (Nguyen et al., 2019) extends ConvKB by stacking a capsule network layer (Sabour et al., 2017) on top of the convolution layer.", "cite_spans": [ { "start": 67, "end": 88, "text": "(Socher et al., 2013)", "ref_id": "BIBREF75" }, { "start": 252, "end": 271, "text": "(Dong et al., 2014)", "ref_id": "BIBREF18" }, { "start": 452, "end": 475, "text": "(Dettmers et al., 2018)", "ref_id": "BIBREF16" }, { "start": 480, "end": 508, "text": "ConvKB (Nguyen et al., 2018)", "ref_id": null }, { "start": 844, "end": 868, "text": "(Bala\u017eevi\u0107 et al., 2019)", "ref_id": "BIBREF2" }, { "start": 1047, "end": 1067, "text": "(Shang et al., 2019)", "ref_id": "BIBREF71" }, { "start": 1165, "end": 1189, "text": "(Vashishth et al., 2020)", "ref_id": "BIBREF85" }, { "start": 1438, "end": 1459, "text": "(Sabour et al., 2017)", "ref_id": "BIBREF69" } ], "ref_spans": [], "eq_spans": [], "section": "ComplEx", "sec_num": null }, { "text": "Complex vector-based models: Instead of embedding entities and relations in the real-valued vector space, ComplEx (Trouillon et al., 2016) is an extension of DISTMULT in the complex vector space. ComplEx-N3 (Lacroix et al., 2018) extends ComplEx with weighted nuclear 3-norm. Also in the complex vector space, RotatE (Sun et al., 2019) defines each relation as a rotation from the head entity to the tail entity. QuatE (Zhang et al., 2019) represents entities by quaternion embeddings (i.e. hypercomplexvalued embeddings) and models relations as rotations in the quaternion space by employing the Hamilton and quaternion-inner products.", "cite_spans": [ { "start": 114, "end": 138, "text": "(Trouillon et al., 2016)", "ref_id": "BIBREF83" }, { "start": 207, "end": 229, "text": "(Lacroix et al., 2018)", "ref_id": "BIBREF43" }, { "start": 317, "end": 335, "text": "(Sun et al., 2019)", "ref_id": "BIBREF77" }, { "start": 419, "end": 439, "text": "(Zhang et al., 2019)", "ref_id": "BIBREF106" } ], "ref_spans": [], "eq_spans": [], "section": "ComplEx", "sec_num": null }, { "text": "All embedding models mentioned above in Section 3.1 only take triples into account. Thus, these models ignore potentially useful information implicitly presented by the structure of the KG. \u2212\u2212\u2212\u2212\u2212\u2212\u2212\u2212\u2192 t should indicate a relationship \"nationality\" between the h and t entities. Also, neighborhood information of entities could be useful for predicting the relationship between two entities as well. For example, in the KG NELL (Carlson et al., 2010) , we have information such as if a person works for an organization and this person also leads that organization, then it is likely that this person is the CEO of that organization.", "cite_spans": [ { "start": 426, "end": 448, "text": "(Carlson et al., 2010)", "ref_id": "BIBREF11" } ], "ref_spans": [], "eq_spans": [], "section": "Relation Path-based Embedding Models", "sec_num": "3.2" }, { "text": "Recent research has also shown that relation paths between entities in KGs provide richer context information and improve the performance of embedding models for KG completion (Luo et al., 2015; Liang and Forbus, 2015; Garc\u00eda-Dur\u00e1n et al., 2015; Guu et al., 2015; Toutanova et al., 2016; Dur\u00e1n and Niepert, 2018; Takahashi et al., 2018; Chen et al., 2018) . In particular, Luo et al. (2015) constructed relation paths between entities and, viewing entities and relations in the path as pseudo-words, then applied Word2Vec (Mikolov et al., 2013) to produce pre-trained vectors for these pseudo-words. Luo et al. (2015) showed that using these pre-trained vectors for initialization helps to improve the performance of models TransE (Bordes et al., 2013) , SME and SE (Bordes et al., 2011) . Liang and Forbus (2015) used the plausibility score produced by SME to compute the weights of relation paths.", "cite_spans": [ { "start": 176, "end": 194, "text": "(Luo et al., 2015;", "ref_id": "BIBREF52" }, { "start": 195, "end": 218, "text": "Liang and Forbus, 2015;", "ref_id": "BIBREF47" }, { "start": 219, "end": 245, "text": "Garc\u00eda-Dur\u00e1n et al., 2015;", "ref_id": "BIBREF28" }, { "start": 246, "end": 263, "text": "Guu et al., 2015;", "ref_id": "BIBREF33" }, { "start": 264, "end": 287, "text": "Toutanova et al., 2016;", "ref_id": "BIBREF82" }, { "start": 288, "end": 312, "text": "Dur\u00e1n and Niepert, 2018;", "ref_id": "BIBREF19" }, { "start": 313, "end": 336, "text": "Takahashi et al., 2018;", "ref_id": "BIBREF79" }, { "start": 337, "end": 355, "text": "Chen et al., 2018)", "ref_id": "BIBREF13" }, { "start": 373, "end": 390, "text": "Luo et al. (2015)", "ref_id": "BIBREF52" }, { "start": 522, "end": 544, "text": "(Mikolov et al., 2013)", "ref_id": "BIBREF54" }, { "start": 600, "end": 617, "text": "Luo et al. (2015)", "ref_id": "BIBREF52" }, { "start": 731, "end": 752, "text": "(Bordes et al., 2013)", "ref_id": "BIBREF8" }, { "start": 766, "end": 787, "text": "(Bordes et al., 2011)", "ref_id": "BIBREF6" }, { "start": 790, "end": 813, "text": "Liang and Forbus (2015)", "ref_id": "BIBREF47" } ], "ref_spans": [], "eq_spans": [], "section": "Relation Path-based Embedding Models", "sec_num": "3.2" }, { "text": "PTransE-RNN (Lin et al., 2015a ) models relation paths by using a recurrent neural network (RNN). In addition, Das et al. (2017) 's model and ROPs (Yin et al., 2018) also apply RNN to model the path between an entity pair, however, in contrast to PTransE-RNN, they additionally take the intermediate entities present in the path into account. IRN (Shen et al., 2017 ) uses a shared memory and RNN-based controller to implicitly model multi-step structured relationships. RTransE (Garc\u00eda-Dur\u00e1n et al., 2015) , PTransE-ADD (Lin et al., 2015a) and TransE-COMP (Guu et al., 2015) extend TransE to represent a relation path by a vector which is the sum of the vectors of all relations in the path. In Bilinear-COMP (Guu et al., 2015) and PRUNED-PATHS (Toutanova et al., 2016) , each relation is a matrix and so it represents the relation path by matrix multiplication. Dur\u00e1n and Niepert (2018) proposed the KB LRN framework to combine relational paths with latent and numerical features.", "cite_spans": [ { "start": 12, "end": 30, "text": "(Lin et al., 2015a", "ref_id": "BIBREF48" }, { "start": 111, "end": 128, "text": "Das et al. (2017)", "ref_id": "BIBREF14" }, { "start": 147, "end": 165, "text": "(Yin et al., 2018)", "ref_id": "BIBREF102" }, { "start": 347, "end": 365, "text": "(Shen et al., 2017", "ref_id": "BIBREF72" }, { "start": 479, "end": 506, "text": "(Garc\u00eda-Dur\u00e1n et al., 2015)", "ref_id": "BIBREF28" }, { "start": 521, "end": 540, "text": "(Lin et al., 2015a)", "ref_id": "BIBREF48" }, { "start": 557, "end": 575, "text": "(Guu et al., 2015)", "ref_id": "BIBREF33" }, { "start": 710, "end": 728, "text": "(Guu et al., 2015)", "ref_id": "BIBREF33" }, { "start": 746, "end": 770, "text": "(Toutanova et al., 2016)", "ref_id": "BIBREF82" }, { "start": 864, "end": 888, "text": "Dur\u00e1n and Niepert (2018)", "ref_id": "BIBREF19" } ], "ref_spans": [], "eq_spans": [], "section": "Relation Path-based Embedding Models", "sec_num": "3.2" }, { "text": "The neighborhood mixture model TransE-NMM (Nguyen et al., 2016a) can be also viewed as a threerelation path model because it takes into account the neighborhood entity and relation information of both head and tail entities in each triple. ReInceptionE (Xie et al., 2020) employs the Inception network (Szegedy et al., 2016) to increase the interactions between head and relation embeddings for obtaining better representations of the head and relation pairs and then uses a relation-aware attention mechanism to enrich these pair representations with the local neighborhood and global entity information. Neighborhood information is also exploited in R- GCN (Schlichtkrull et al., 2018) , SACN (Shang et al., 2019) and KBGAT (Nathani et al., 2019) , which generalize graph convolutional networks (Kipf and Welling, 2017) and graph attention networks (Velikovi et al., 2018) for dealing with highly multi-relational data, e.g. KGs. For computing the final representation of an entity, they make use of layer-wise propagation to accumulate linearly-transformed embeddings of its neighboring entities through a normalized sum with different relational weights. For link prediction, R-GCN, SACN and KBGAT apply DISTMULT, Conv-TransE and ConvKB to compute triple scores, respectively.", "cite_spans": [ { "start": 253, "end": 271, "text": "(Xie et al., 2020)", "ref_id": "BIBREF98" }, { "start": 302, "end": 324, "text": "(Szegedy et al., 2016)", "ref_id": "BIBREF78" }, { "start": 655, "end": 687, "text": "GCN (Schlichtkrull et al., 2018)", "ref_id": null }, { "start": 695, "end": 715, "text": "(Shang et al., 2019)", "ref_id": "BIBREF71" }, { "start": 726, "end": 748, "text": "(Nathani et al., 2019)", "ref_id": "BIBREF56" }, { "start": 851, "end": 874, "text": "(Velikovi et al., 2018)", "ref_id": "BIBREF86" } ], "ref_spans": [], "eq_spans": [], "section": "Relation Path-based Embedding Models", "sec_num": "3.2" }, { "text": "The Path Ranking Algorithm (PRA) (Lao and Cohen, 2010 ) is a random walk inference technique which was proposed to predict a new relationship between two entities in KGs. Lao et al. (2011) used PRA to estimate the probability of an unseen triple as a combination of weighted random walks that follow different paths linking the head entity and tail entity in the KG. Gardner et al. (2014) made use of an external text corpus to increase the connectivity of the KG used as the input to PRA. Gardner and Mitchell (2015) improved PRA by proposing a subgraph feature extraction technique to make the generation of random walks in KGs more efficient and expressive, while extended PRA to couple the path ranking of multiple relations. PRA can also be used in conjunction with first-order logic in the discriminative Gaifman model (Niepert, 2016) . In addition, Neelakantan et al. (2015) used a RNN to learn vector representations of PRA-style relation paths between entities in the KG. Other random-walk based learning algorithms for KG completion can be also found in Feng et al. (2016b) , , , Mazumder and Liu (2017) and Das et al. (2018) . proposed a Neural Logic Programming (LP) framework to learning probabilistic first-order logical rules for KG reasoning, producing competitive link prediction performances. Feldman", "cite_spans": [ { "start": 33, "end": 53, "text": "(Lao and Cohen, 2010", "ref_id": "BIBREF44" }, { "start": 171, "end": 188, "text": "Lao et al. (2011)", "ref_id": "BIBREF45" }, { "start": 367, "end": 388, "text": "Gardner et al. (2014)", "ref_id": "BIBREF31" }, { "start": 490, "end": 517, "text": "Gardner and Mitchell (2015)", "ref_id": "BIBREF30" }, { "start": 825, "end": 840, "text": "(Niepert, 2016)", "ref_id": "BIBREF66" }, { "start": 856, "end": 881, "text": "Neelakantan et al. (2015)", "ref_id": "BIBREF58" }, { "start": 1064, "end": 1083, "text": "Feng et al. (2016b)", "ref_id": "BIBREF26" }, { "start": 1090, "end": 1113, "text": "Mazumder and Liu (2017)", "ref_id": "BIBREF53" }, { "start": 1118, "end": 1135, "text": "Das et al. (2018)", "ref_id": "BIBREF15" } ], "ref_spans": [], "eq_spans": [], "section": "Other KG Completion Models", "sec_num": "3.3" }, { "text": "| E | | R | #Triples in train/valid/test FB15k (Bordes et al., 2013) 14,951 1,345 483,142 50,000 59,071 WN18 (Bordes et al., 2013) 40,943 18 141,442 5,000 5,000 FB15k-237 Chen, 2015) 14,541 237 272,115 17,535 20,466 WN18RR Dettmers et al. (2018) 40,943 11 86,835 3,034 3,134 2019presented an approach to generate sentences from triples via hand-craft templates, and then use the likelihoods produced by the pre-trained BERT (Devlin et al., 2019) for these generated sentences to score the plausibility of the corresponding triples. See other methods for learning from KGs and multi-relational data in Nickel et al. (2016a) and .", "cite_spans": [ { "start": 47, "end": 68, "text": "(Bordes et al., 2013)", "ref_id": "BIBREF8" }, { "start": 109, "end": 130, "text": "(Bordes et al., 2013)", "ref_id": "BIBREF8" }, { "start": 171, "end": 245, "text": "Chen, 2015) 14,541 237 272,115 17,535 20,466 WN18RR Dettmers et al. (2018)", "ref_id": null }, { "start": 424, "end": 445, "text": "(Devlin et al., 2019)", "ref_id": "BIBREF17" }, { "start": 601, "end": 622, "text": "Nickel et al. (2016a)", "ref_id": "BIBREF64" } ], "ref_spans": [], "eq_spans": [], "section": "Dataset", "sec_num": null }, { "text": "The standard evaluation task of entity prediction, i.e. the link prediction task (Bordes et al., 2013) , is proposed to evaluate embedding models for KG completion. 3", "cite_spans": [ { "start": 81, "end": 102, "text": "(Bordes et al., 2013)", "ref_id": "BIBREF8" } ], "ref_spans": [], "eq_spans": [], "section": "Evaluation Task", "sec_num": "4" }, { "text": "Datasets: Information about benchmark datasets for KG completion evaluation is given in Table 2 . FB15k and WN18 are derived from the large real-world KG Freebase (Bollacker et al., 2008) and the large lexical KG WordNet (Miller, 1995) , respectively. Toutanova and Chen (2015) noted that FB15k and WN18 are not challenging datasets because they contain many reversible triples. Dettmers et al. (2018) showed a concrete example: A test triple (feline, hyponym, cat) can be mapped to a training triple (cat, hypernym, feline), thus knowing that \"hyponym\" and \"hypernym\" are reversible allows us to easily predict the majority of test triples. So, datasets FB15k-237 (Toutanova and Chen, 2015) and WN18RR (Dettmers et al., 2018) are created to serve as realistic KG completion datasets which represent a more challenging learning setting. FB15k-237 and WN18RR are subsets of FB15k and WN18, respectively.", "cite_spans": [ { "start": 163, "end": 187, "text": "(Bollacker et al., 2008)", "ref_id": "BIBREF5" }, { "start": 221, "end": 235, "text": "(Miller, 1995)", "ref_id": "BIBREF55" }, { "start": 252, "end": 277, "text": "Toutanova and Chen (2015)", "ref_id": "BIBREF81" }, { "start": 379, "end": 401, "text": "Dettmers et al. (2018)", "ref_id": "BIBREF16" }, { "start": 665, "end": 691, "text": "(Toutanova and Chen, 2015)", "ref_id": "BIBREF81" }, { "start": 703, "end": 726, "text": "(Dettmers et al., 2018)", "ref_id": "BIBREF16" } ], "ref_spans": [ { "start": 88, "end": 95, "text": "Table 2", "ref_id": "TABREF1" } ], "eq_spans": [], "section": "Evaluation Task", "sec_num": "4" }, { "text": "The entity prediction task, i.e. link prediction (Bordes et al., 2013) , predicts the head or the tail entity given the relation type and the other entity, i.e. predicting h given (?, r, t) or predicting t given (h, r, ?) where ? denotes the missing element. The results are evaluated using a ranking induced by the function f (h, r, t) on test triples. Each correct test triple (h, r, t) is corrupted by replacing either its head or tail entity by each of the possible entities in turn, and then these candidates are ranked in descending order of their plausibility score. The \"Filtered\" setting protocol, described in Bordes et al. (2013) , filters out before ranking any corrupted triples that appear in the KG. Ranking a corrupted triple appearing in the KG (i.e. a correct triple) higher than the original test triple is also correct, thus this \"Filtered\" setting provides a clear view on the ranking performance.", "cite_spans": [ { "start": 49, "end": 70, "text": "(Bordes et al., 2013)", "ref_id": "BIBREF8" }, { "start": 620, "end": 640, "text": "Bordes et al. (2013)", "ref_id": "BIBREF8" } ], "ref_spans": [], "eq_spans": [], "section": "Task Description", "sec_num": "4.1" }, { "text": "In addition to the mean rank and the Hits@10 (i.e. the proportion of test triples for which the target entity is ranked in the top 10 predictions), which were originally used in the entity prediction task (Bordes et al., 2013) , recent work also reports the mean reciprocal rank (MRR). 4 Mean rank is always greater or equal to 1 and the lower mean rank indicates better entity prediction performance, while MRR and Hits@10 scores always range from 0.0 to 1.0, and higher score reflects better prediction result.", "cite_spans": [ { "start": 205, "end": 226, "text": "(Bordes et al., 2013)", "ref_id": "BIBREF8" } ], "ref_spans": [], "eq_spans": [], "section": "Task Description", "sec_num": "4.1" }, { "text": "Tables 3 and 4 list recent entity prediction results of KG completion models on FB15k and WN18 and on FB15k-237 and WN18RR, respectively. In Table 3 , the first 28 rows report the performance of triple-based models that directly optimize a score function for the triples in a KG, i.e. they do not exploit information about alternative paths between head and tail entities. The next 9 rows report results", "cite_spans": [], "ref_spans": [ { "start": 141, "end": 148, "text": "Table 3", "ref_id": null } ], "eq_spans": [], "section": "Main Results", "sec_num": "4.2" }, { "text": "WN18 MR @10 MRR MR @10 MRR TransH (Wang et al., 2014) 87 64.4 -303 86.7 -TransR (Lin et al., 2015b) 77 68.7 -225 92.0 -CTransR (Lin et al., 2015b) 75 70.2 -218 92.3 -KG2E 59 74.0 -331 92.8 -TransD 91 77.3 -212 92.2 -lppTransD (Yoon et al., 2016) 78 78.7 -270 94.3 -TransG (Xiao et al., 2016) 98 79.8 -470 93.3 -TranSparse (Ji et al., 2016) 82 79.5 -211 93.2 -TranSparse-DT (Nickel et al., 2016b) -73.9 0.524 -94.9 0.938 ComplEx (Trouillon et al., 2016) -84.0 0.692 -94.7 0.941 ANALOGY (Dettmers et al., 2018) 64 87.3 0.745 504 95.5 0.942 HypER (Bala\u017eevi\u0107 et al., 2019) 44 88.5 0.790 431 95.8 0.951 RotatE (Sun et al., 2019) 40 88.4 0.797 309 95.9 0.949 QuatE (Zhang et al., 2019) 17 90.0 0.782 162 95.9 0.950 ComplEx-N3 (Lacroix et al., (Lin et al., 2015a) 58 84.6 ----PTransE-RNN (Lin et al., 2015a) 92 82.2 ----GAKE (Feng et al., 2016b) 119 64.8 ----Gaifman (Niepert, 2016) 108 73.0 -114 92.9 -SSP (Xiao et al., 2017) 82 79.0 -156 93.2 - Table 3 : Entity prediction results on WN18 and FB15k, which are taken from the corresponding papers. MR and @10 denote metrics mean rank and Hits@10 (in %), respectively of models that exploit information about relation paths or neighborhood information. The last 2 rows present results for models which make use of textual mentions derived from a large external corpus. In Table 4 , the last 5 rows report results of models that exploit the path or neighborhood information. In general, Tables 3 and 4 show that the models using external corpus information or employing path information achieve better scores than the triple-based models that do not use such information. In terms of models not exploiting path or external information, the complex vector-based models (e.g. QuatE, CompleEx-N3 and RotatE) produce the strongest evaluation scores, followed by the neural networkbased models (e.g. CapsE, InteractE and HypER). 5 Tables 3 and 4 also show that TransE and DIST-MULT, despite of theirs simplicity, can produce very competitive results (i.e. by performing a careful grid search of hyper-parameters). ", "cite_spans": [ { "start": 34, "end": 53, "text": "(Wang et al., 2014)", "ref_id": "BIBREF89" }, { "start": 80, "end": 99, "text": "(Lin et al., 2015b)", "ref_id": "BIBREF49" }, { "start": 127, "end": 146, "text": "(Lin et al., 2015b)", "ref_id": "BIBREF49" }, { "start": 226, "end": 245, "text": "(Yoon et al., 2016)", "ref_id": "BIBREF103" }, { "start": 272, "end": 291, "text": "(Xiao et al., 2016)", "ref_id": "BIBREF95" }, { "start": 322, "end": 339, "text": "(Ji et al., 2016)", "ref_id": "BIBREF38" }, { "start": 373, "end": 395, "text": "(Nickel et al., 2016b)", "ref_id": "BIBREF65" }, { "start": 428, "end": 452, "text": "(Trouillon et al., 2016)", "ref_id": "BIBREF83" }, { "start": 485, "end": 508, "text": "(Dettmers et al., 2018)", "ref_id": "BIBREF16" }, { "start": 544, "end": 568, "text": "(Bala\u017eevi\u0107 et al., 2019)", "ref_id": "BIBREF2" }, { "start": 605, "end": 623, "text": "(Sun et al., 2019)", "ref_id": "BIBREF77" }, { "start": 659, "end": 679, "text": "(Zhang et al., 2019)", "ref_id": "BIBREF106" }, { "start": 720, "end": 736, "text": "(Lacroix et al.,", "ref_id": null }, { "start": 737, "end": 756, "text": "(Lin et al., 2015a)", "ref_id": "BIBREF48" }, { "start": 781, "end": 800, "text": "(Lin et al., 2015a)", "ref_id": "BIBREF48" }, { "start": 818, "end": 838, "text": "(Feng et al., 2016b)", "ref_id": "BIBREF26" }, { "start": 860, "end": 875, "text": "(Niepert, 2016)", "ref_id": "BIBREF66" }, { "start": 900, "end": 919, "text": "(Xiao et al., 2017)", "ref_id": "BIBREF96" }, { "start": 1866, "end": 1867, "text": "5", "ref_id": null } ], "ref_spans": [ { "start": 940, "end": 947, "text": "Table 3", "ref_id": null }, { "start": 1315, "end": 1322, "text": "Table 4", "ref_id": "TABREF6" }, { "start": 1429, "end": 1443, "text": "Tables 3 and 4", "ref_id": "TABREF6" } ], "eq_spans": [], "section": "FB15k", "sec_num": null }, { "text": "The reasons why much work has been devoted towards developing triple-based models are: (1) additional information sources might not be available, e.g., for KGs for specialized domains, (2) models that do not exploit path information or external resources are simpler and thus typically much faster to train than the more complex models using path or external information, and (3) the more complex models that exploit path or external information are typically extensions of these simpler models, and are often initialized with parameters estimated by such simpler models, so improvements to the simpler models should yield corresponding improvements to the more complex models as well (Nguyen et al., 2016b) .", "cite_spans": [ { "start": 685, "end": 707, "text": "(Nguyen et al., 2016b)", "ref_id": "BIBREF60" } ], "ref_spans": [], "eq_spans": [], "section": "Discussion and Conclusion", "sec_num": "5" }, { "text": "It is worth to further explore those KG completion embedding models for a new application where we could formulate its corresponding data into triples. For example, in Web search engines, we observe useroriented relationships between submitted queries and documents returned by the search engines. That is, we have triple representations (query, user, document) in which for each user-oriented relationship, we would have many queries and documents, resulting in a lot of Many-to-Many relationships. Inspired by this observation, Vu et al. (2017 ) applied STransE (Nguyen et al., 2016b for search personalization to re-rank the search documents returned by a search engine for users' submitted queries. Other application examples can be also found for recommender systems (Zhang et al., 2016; He et al., 2017; Cao et al., 2019) , social relation extraction (Tu et al., 2017) and visual relation detection .", "cite_spans": [ { "start": 530, "end": 545, "text": "Vu et al. (2017", "ref_id": "BIBREF87" }, { "start": 546, "end": 585, "text": ") applied STransE (Nguyen et al., 2016b", "ref_id": null }, { "start": 772, "end": 792, "text": "(Zhang et al., 2016;", "ref_id": "BIBREF104" }, { "start": 793, "end": 809, "text": "He et al., 2017;", "ref_id": "BIBREF35" }, { "start": 810, "end": 827, "text": "Cao et al., 2019)", "ref_id": "BIBREF10" }, { "start": 857, "end": 874, "text": "(Tu et al., 2017)", "ref_id": "BIBREF84" } ], "ref_spans": [], "eq_spans": [], "section": "Discussion and Conclusion", "sec_num": "5" }, { "text": "Future research directions might also include: (i) Combining logical rules which contain rich background information and KG triples in a unified KG completion framework, e.g. jointly embedding KGs and logical rules (Guo et al., 2016; . (ii) Recent embedding models for KG completion hold a closed-world assumption where the KGs are fixed (i.e. new entities might not be added easily), therefore it would be worth exploring open-world KG completion models to connect unseen entities to the existing KGs (Shi and Weninger, 2018) . (iii) Investigating efficient approaches which can be applied to large-scale KGs of millions of entities and relations (Zhang et al., 2020) .", "cite_spans": [ { "start": 215, "end": 233, "text": "(Guo et al., 2016;", "ref_id": "BIBREF32" }, { "start": 502, "end": 526, "text": "(Shi and Weninger, 2018)", "ref_id": "BIBREF74" }, { "start": 648, "end": 668, "text": "(Zhang et al., 2020)", "ref_id": "BIBREF107" } ], "ref_spans": [], "eq_spans": [], "section": "Discussion and Conclusion", "sec_num": "5" }, { "text": "In this paper, we have presented a comprehensive survey of embedding models of entity and relationships for knowledge graph completion. This paper also provides update-to-date experimental results of the embedding models for the entity prediction (i.e. link prediction) task on benchmark datasets FB15k, WN18, FB15k-237 and WN18RR. We hope that this paper serves its purpose by providing a concrete foundation for future research and applications on the topic.", "cite_spans": [], "ref_spans": [], "eq_spans": [], "section": "Discussion and Conclusion", "sec_num": "5" }, { "text": "All the losses can also include an L2 regularization on the model parameters, which is not shown for simplification.", "cite_spans": [], "ref_spans": [], "eq_spans": [], "section": "", "sec_num": null }, { "text": "A relation type r is classified Many-to-1 if multiple head entities can be connected by r to at most one tail entity. A relation type r is classified 1-to-Many if multiple tail entities can be linked by r from at most one head entity. A relation type r is classified Many-to-Many if multiple head entities can be connected by r to a tail entity and vice versa.", "cite_spans": [], "ref_spans": [], "eq_spans": [], "section": "", "sec_num": null }, { "text": "Another evaluation task for KG completion is triple classification(Socher et al., 2013), however, it is not as widely used as the link prediction task. See the Supplementary file for a summary of triple classification results.4 See Baeza-Yates and Ribeiro-Neto (2011) for definitions of the mean rank, Hits@10 and MRR. Some recent work additionally reported Hits@1 (i.e. the proportion of test triples for which the target entity is ranked first). However, formulas of MRR and Hits@1 show a strong correlation between these two scores. So using Hits@1 might not reveal any additional insight.", "cite_spans": [], "ref_spans": [], "eq_spans": [], "section": "", "sec_num": null }, { "text": "CapsE uses the pre-trained word embeddings for entity vector initialization on WN18RR. It is not surprising that CapsE produces the best MR on WN18RR as many entity names in WordNet are lexically meaningful. It is possible for all other embedding models to utilize the pre-trained word vectors as well. However, averaging the pre-trained word embeddings for initializing entity vectors is an open problem, and it is not always useful since entity names in many domain-specific KGs are not lexically meaningful(Wang et al., 2014;Guu et al., 2015).", "cite_spans": [], "ref_spans": [], "eq_spans": [], "section": "", "sec_num": null } ], "back_matter": [ { "text": "Filtered FB15k-237 WN18RR MR @10 MRR MR @10 MRR IRN (Shen et al., 2017) 211 46.4 ----KBGAN (Cai and Wang, 2018) -45.8 0.278 -48.1 0.213 DISTMULT (Yang et al., 2015) [ ] 254 41.9 0.241 5110 49 0.43 ComplEx (Trouillon et al., 2016) [ ] 339 42.8 0.247 5261 51 0.44 ConvE (Dettmers et al., 2018) 246 49.1 0.316 5277 48 0.46 ER-MLP (Dong et al., 2014) [\u2660] 219 54.0 0.342 4798 41.9 0.366 HypER (Bala\u017eevi\u0107 et al., 2019) 250 52.0 0.341 5798 52.2 0.465 TransE (Bordes et al., 2013) (Vashishth et al., 2020) 172 53.5 0.354 5202 52.8 0.463 RotatE (Sun et al., 2019) 177 53.3 0.338 3340 57.1 0.476 QuatE (Zhang et al., (Dur\u00e1n and Niepert, 2018) 209 49.3 0.309 ---KBGAT (Nathani et al., 2019) 210 62.6 0.518 1940 58.1 0.440 ReInceptionE (Xie et al., 2020) 173 52.8 0.349 1894 58.2 0.483 SACN (Shang et al., 2019) -54 0.35 -54 0.47", "cite_spans": [ { "start": 52, "end": 71, "text": "(Shen et al., 2017)", "ref_id": "BIBREF72" }, { "start": 91, "end": 111, "text": "(Cai and Wang, 2018)", "ref_id": "BIBREF9" }, { "start": 145, "end": 164, "text": "(Yang et al., 2015)", "ref_id": "BIBREF100" }, { "start": 205, "end": 229, "text": "(Trouillon et al., 2016)", "ref_id": "BIBREF83" }, { "start": 268, "end": 291, "text": "(Dettmers et al., 2018)", "ref_id": "BIBREF16" }, { "start": 327, "end": 346, "text": "(Dong et al., 2014)", "ref_id": "BIBREF18" }, { "start": 347, "end": 350, "text": "[\u2660]", "ref_id": null }, { "start": 388, "end": 412, "text": "(Bala\u017eevi\u0107 et al., 2019)", "ref_id": "BIBREF2" }, { "start": 451, "end": 472, "text": "(Bordes et al., 2013)", "ref_id": "BIBREF8" }, { "start": 473, "end": 497, "text": "(Vashishth et al., 2020)", "ref_id": "BIBREF85" }, { "start": 536, "end": 554, "text": "(Sun et al., 2019)", "ref_id": "BIBREF77" }, { "start": 592, "end": 606, "text": "(Zhang et al.,", "ref_id": null }, { "start": 607, "end": 632, "text": "(Dur\u00e1n and Niepert, 2018)", "ref_id": "BIBREF19" }, { "start": 657, "end": 679, "text": "(Nathani et al., 2019)", "ref_id": "BIBREF56" }, { "start": 724, "end": 742, "text": "(Xie et al., 2020)", "ref_id": "BIBREF98" }, { "start": 779, "end": 799, "text": "(Shang et al., 2019)", "ref_id": "BIBREF71" } ], "ref_spans": [], "eq_spans": [], "section": "Method", "sec_num": null } ], "bib_entries": { "BIBREF0": { "ref_id": "b0", "title": "Random Walks for Knowledge-Based Word Sense Disambiguation", "authors": [ { "first": "Eneko", "middle": [], "last": "Agirre", "suffix": "" } ], "year": 2013, "venue": "Computational Linguistics", "volume": "40", "issue": "1", "pages": "57--84", "other_ids": {}, "num": null, "urls": [], "raw_text": "Eneko Agirre, Oier L\u00f3pez de Lacalle, and Aitor Soroa. 2013. 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In ICLR.", "links": null } }, "ref_entries": { "FIGREF0": { "uris": null, "text": "Two-dimensional projection of vectors of countries and their capitals. This figure is drawn based on Mikolov et al. (2013).", "num": null, "type_str": "figure" }, "FIGREF1": { "uris": null, "text": "Figure 2: An illustration of (incomplete) knowledge base, with 4 person entities, 2 place entities, 2 relation types and total 6 triple facts. This figure is drawn based on Weston and Bordes (2014).", "num": null, "type_str": "figure" }, "FIGREF2": { "uris": null, "text": "For example, the relation path h born in city \u2212\u2212\u2212\u2212\u2212\u2212\u2192 e city in country", "num": null, "type_str": "figure" }, "FIGREF3": { "uris": null, "text": ". [ ], [ ], [\u2660] and [\u2663] denote results taking from Yang et al. (2015), Nickel et al. (2016b), Ravishankar et al. (2017) and Kadlec et al. (2017), respectively.", "num": null, "type_str": "figure" }, "TABREF0": { "num": null, "type_str": "table", "text": "", "html": null, "content": "" }, "TABREF1": { "num": null, "type_str": "table", "text": "Statistics of benchmark experimental datasets.", "html": null, "content": "
" }, "TABREF6": { "num": null, "type_str": "table", "text": "Entity prediction results on WN18RR and FB15k-237, which are taken from the corresponding papers. [ ], [\u2660] and [ ] denote results taking from Dettmers et al. (2018), Ravishankar et al. (2017) and Nguyen et al. (2019), respectively.", "html": null, "content": "
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