Method and system for automatically discovering inference rule, database and retrieval method

A knowledge database, comprises:

• a data inputting device configured to input knowledge data;
• a relation matrix learner configured to acquire a relation matrix for each knowledge relation, the relation matrix representing a relationship between vectors of knowledge entities having the knowledge relation, the knowledge base comprising a plurality of knowledges, each knowledge comprising two knowledge entities and one knowledge relation between the two knowledge entities;
• an inference result finder configured to acquire the inference results in accordance with the relation matrices for the plurality of knowledge relations, each inference result comprising a first knowledge relation, a knowledge relation and a third knowledge medical relation, the inference result representing that the third knowledge relation is inferred from the first knowledge relation and the second knowledge relation;
• an inputting device configured to input a search word or search pattern;
• a searcher configured to perform a search operation in accordance with the inference result using the search word or search pattern, so as to acquire the knowledge related to the search word or search pattern;
• an outputting device configured to output the knowledge related to the search word or search pattern;
• and
• optionally an entity vector learner configured to acquire a one-hot code vector for each knowledge entity through the following formula:
• x
• e
• =
• (
• a
• 1
• ,
• …
• 
• ,
• a
• i
• ,
• …
• 
• ,
• a
• N
• )
• ,
• a
• j
• =
• {
• 1
• ,
• if
• 
• 
• j
• =
• i
• 0
• ,
• if
• 
• 
• j
• ≠
• i
• where N represents the number of the knowledge entities in the knowledge base, and xe represents a vector in N*1 dimensions;
• and acquire a vector of each knowledge entity in accordance with the one-hot code vector for each knowledge entity through the following formula:
• ye=σ(Wxe), σ(x)=1/(1+ex)
• where ye represents a vector in K*1 dimensions, W represents a mapping matrix and it is a vector in K*N dimensions, and K is a predetermined value smaller than N.