Knowledge map: basic concepts

Definition of knowledge map

Knowledge map is a relational network composed of structured representation of knowledge about a topic , It consists of nodes and （ Connecting different nodes ） Edge composition , It's essentially a semantic network . Each node in the knowledge map represents an entity or concept within the topic , Edges represent semantic relationships between connected entities or concepts .

What is knowledge ： From data to knowledge

• data ： Records of unprocessed facts or signals （ namely ： Unstructured data ）
• Information ： After explanation and sorting , Meaningful data （ namely ： Structured data ）
• knowledge ： Facts or laws inferred or predicted from information

For example, for the resume analysis task ： An original pdf or word Format resume file is data , Because it is a direct collection （ collect ） To the objective facts 、 Has not been manually processed by the task ; Through text extraction technology , The line by line text document of the obtained resume content is information , It has been structured ; Re pass NER technology , Extract the name from the resume text document 、 After working experience and other physical information , This information about the target entity can be understood as a kind of knowledge .

A structured representation of knowledge ： Knowledge means

Knowledge means （knowledge representation） It is a method to describe human brain knowledge in a way that is easy to be processed by computer ¹. It can be divided into Symbolic representation and Vector representation （Embeding） Two types of , Symbolic representation Good explainability 、 Development and construction are simple , But it is not easy to depict implicit knowledge , And knowledge reasoning is difficult ; Vector representation Good robustness 、 It is easy to depict implicit knowledge and conduct knowledge reasoning , But it also loses the interpretability of symbolic representation , And it needs the secondary development of knowledge map based on symbolic representation , The implementation is complex 、 Development costs are higher . Please read the author's article for more details ： Knowledge map ： Knowledge means .

Semantic Web ： Development history of knowledge map

Semantic web is the current Web（ web ） Technology expansion . In the Semantic Web , Information is given a well-defined meaning , It can better make computers and people work together .

noumenon 、 Entities and relationships

noumenon （ontology）, Entity （entity）, Relationship （relation）, attribute （property）

---

1. In general , The knowledge in human brain is often sound 、 Images 、 Unstructured information such as sensory signals and language descriptions , This is difficult for computers to understand , Therefore, it needs to be edited into structured data that can be understood by computers through some method . ︎