JPH09190352A - Construction support system for expert system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely and easily produce and change the rules. SOLUTION: In an expert system where the rete algorithm is used in a recognition execution cycle, a rete network is formed between the edited (produced/ changed) rules which are stored in a rule base and the existing rule groups and shown on a display screen (S1 to S3). When the nodes are selected in the displayed rete network (S5), the nodes related to the selected ones are searched (S6). Then the searched nodes are displayed together with the network where the inter-node link display attributes are changed (S7).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an expert system construction support method using a RETE algorithm in a cognitive execution cycle, and more particularly to a rule creation / change method.

[0002]

2. Description of the Related Art There is a system that uses a production system as knowledge information processing in an expert system. In this production system, the IF premise part T
The HEN conclusion part format production rule is used as a rule base, and the inference engine searches for an executable rule by matching (pattern matching) with the contents of the working memory and the preamble of the production rule, and selects an executable rule from this rule. Then, the answer to the problem is obtained by the cognitive execution cycle of executing the conclusion part of this rule and updating the contents of the working memory.

In this production system, since the collation of the contents of the working memory with the preamble of the production rule occupies most of the processing time, there is an inefficiency when the number of rules increases, and an inference method for improving this is provided. May use the REIT algorithm.

In the REIT algorithm, the rule base is converted into a kind of data flow network expression called a REIT network to connect the rule groups with each other in the network, and the matching process is speeded up without waste.

[0005]

[Problems to be Solved by the Invention]
In the system, the rule base creation describes the premise part and the conclusion part as a piece of knowledge as an expert's knowledge without being aware of the REIT network.

For this reason, the rule creating method is suitable for creating a small-scale (several dozens of rules) rule base, but for creating a large-scale (several hundreds of rules or more) rule base and further changing it. It becomes difficult to create and change the rules while keeping in mind the relationship with other rules, and it becomes easy to create and change wrong rules.

Specifically, it is impossible to understand which rule the newly created rule affects, and what kind of difference the result will have.

It is an object of the present invention to provide a system for constructing and supporting an expert system that ensures and facilitates the creation and modification of rules.

[0009]

According to the present invention, when a rule to be stored in the rule base is created or changed in an expert system which uses a production rule as a rule base and uses a REIT algorithm in a cognitive execution cycle by an inference engine. In addition, a means for performing a reit network with an existing rule group on the rule and displaying it on a display screen, and when a node on the displayed network is selected, a related node is searched centering on the node. And a means for performing network display in which the display attribute of the searched node and the link between the nodes are changed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a rule making / changing procedure showing an embodiment of the present invention. Hereinafter, each process will be described in detail.

(S1) Rule editing: A rule is edited (created / changed) using a text editor.

(S2) Conversion to a REIT network ... The edited rule is networked with an existing rule group using the REIT network conversion function.

(S3) Network display ... The networked rules including the editing rules are displayed on the display screen. FIG. 2 shows a display example of the REIT network, and in this display example, the rules shown in the following table are shown.

[0014]

[Table 1]

For example, rule 3 indicates "if the water level of the pump is high (P) and (&) the water level tends to rise (U), the bubble A is slightly closed (X)".

(S4) Display end ... Whether or not to finish editing the rule is determined depending on whether or not the icon of the end button shown on the network display screen is designated.

(S5) Node selection ... Assuming that the rule editor does not operate the network display end button and wants to know the spread state of a certain rule, whether or not the node with the network display screen is selected is determined. judge. When the clear button on the display screen is operated by this selection, the node selection is canceled.

(S6) Node search: When a node is selected, a related node is searched around the node.

(S7) Display attribute change: The network in which the display attributes of the nodes and the links between the nodes collected by the node search are changed is displayed.

For example, by selecting the element E, B or Q of rule 5 in the rule display of FIG.
As shown in, the link display format of the rule related to the element and the rule not related to the element is changed, and a list of related rules is popped up at the lower right of the screen.

Therefore, according to the present embodiment, when creating / modifying a rule, it is possible to visually see the relationship with another rule in a state where the rule is changed to the REIT network, and to easily know the relationship between the rules. be able to.

Knowing the connection relation between the rules allows the rules to be viewed in a big way, and reduces errors in creating and changing the rules.

Further, as compared with the conventional method in which rules are described in a piecemeal manner, in the present embodiment, it is possible to easily find the presence of unused rules and useless rules by network display, and delete these rules. Therefore, it is effective to improve the matching efficiency.

Further, the list display of the related rules makes it possible to easily obtain information for correctly making / changing the rules.

[0025]

As described above, according to the present invention, when a rule to be stored in the rule base is created / changed, the rule is connected to an existing rule group and displayed on the display screen, and the network is displayed. When the above node is selected, related nodes are searched centering on the relevant node, and the network display is performed with the display attribute of the link between the searched node and the node changed. Has the effect of making sure.

[Brief description of the drawings]

FIG. 1 is a rule creation / change procedure showing an embodiment of the present invention.

FIG. 2 is a display example of a REIT network according to the embodiment.

FIG. 3 is an example of changing display attributes by node selection according to the embodiment.

Claims (1)

[Claims] 1. In an expert system that uses a production rule as a rule base and uses a REIT algorithm in a cognitive execution cycle by an inference engine, when a rule stored in the rule base is created or changed, an existing rule group for the rule is created. Means for performing a reit network with and displaying on a display screen, a means for searching for a related node centered on the node when a node on the displayed network is selected, and the searched node And a means for performing network display in which the display attributes of links between nodes are changed, and an expert system construction support method.