San Jose State University

Knowledge representation learning(KRL) maps entities and relations onto a low dimensional vector space by capturing its semantic meaning. KRL is also called multi-relation learning or statistical relational learning. The recent advancement in distributed representation learning can be categorized into four scopes

 - Representation Space 
 - Scoring Function 
 - Encoding Models 
 - Embedding with Auxiliary Information


Knowledge Representation Learning /Knowledge Graph Embedding

A Survey on Knowledge Graphs: Representation, Acquisition and Applications

KRL model will answer the following four questions

1. ” Which representation space to choose?”
2. ”How to measure the plausibility of triplets in a specific space?”
3. “Which encoding model to use for modeling relational interaction ?”
4. ”Whether to utilize auxiliary information?”


KRL Model 

The space where entities and relations are represented after analysis. Representation space is also called embedding space. The embedding space should satisfy three conditions differentiability, calculation possibility, and definability of a scoring function. The representation space can be categorized into

 - Point-Wise Space
 - Complex Vector Space
 - Gaussian Distribution
 - Manifold and Group:


Representation Space 

A scoring function assigns a numeric value to each candidate output for a given input. An inference procedure can then look for the candidate with the highest score. A common design is to learn an approximate scoring rule and then use an approximate search method to find a strong output.

Scoring Function

Various architecture models are used to capture the interaction between entities and relations.

 - Linear/Bilinear Models
 - Factorization Models
 - Neural Networks
 - Convolutional Neural Networks
 - Recurrent Neural Networks
 - Transformers
 - Graph Neural Networks (GNNs)


Encoding Models

In this form of knowledge representation extra information like text descriptions, type constraints, visual information ,relational paths along with knowledge graphs are used to learn embeddings. The external information needed can be categorized into

 - Textual Description
 - Type Information
 - Visual Information
 - Uncertain Information


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