{"id":23080638,"url":"https://github.com/chen0040/cs-expert-system-shell","last_synced_at":"2025-08-15T22:31:09.103Z","repository":{"id":85883521,"uuid":"90757418","full_name":"chen0040/cs-expert-system-shell","owner":"chen0040","description":"C# implementation of an expert system 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cs-expert-system-shell\nC# implementation of an expert system shell, targeting .Net Core 1.1\n\n[![Build Status](https://travis-ci.org/chen0040/cs-expert-system-shell.svg?branch=master)](https://travis-ci.org/chen0040/cs-expert-system-shell)\n\n# Install\n\nRun the following command to install:\n\n```bash\nInstall-Package cs-expert-system-shell\n```\n\n# Usage\n\nThe sample code below shows how to create a rule engine and initialize it with a set of rules:\n\n```cs \nusing chen0040.ExpertSystem;\npublic RuleInferenceEngine getInferenceEngine()\n{\n\tRuleInferenceEngine rie = new RuleInferenceEngine();\n\n\tRule rule = new Rule(\"Bicycle\");\n\trule.AddAntecedent(new IsClause(\"vehicleType\", \"cycle\"));\n\trule.AddAntecedent(new IsClause(\"num_wheels\", \"2\"));\n\trule.AddAntecedent(new IsClause(\"motor\", \"no\"));\n\trule.setConsequent(new IsClause(\"vehicle\", \"Bicycle\"));\n\trie.AddRule(rule);\n\n\trule = new Rule(\"Tricycle\");\n\trule.AddAntecedent(new IsClause(\"vehicleType\", \"cycle\"));\n\trule.AddAntecedent(new IsClause(\"num_wheels\", \"3\"));\n\trule.AddAntecedent(new IsClause(\"motor\", \"no\"));\n\trule.setConsequent(new IsClause(\"vehicle\", \"Tricycle\"));\n\trie.AddRule(rule);\n\n\trule = new Rule(\"Motorcycle\");\n\trule.AddAntecedent(new IsClause(\"vehicleType\", \"cycle\"));\n\trule.AddAntecedent(new IsClause(\"num_wheels\", \"2\"));\n\trule.AddAntecedent(new IsClause(\"motor\", \"yes\"));\n\trule.setConsequent(new IsClause(\"vehicle\", \"Motorcycle\"));\n\trie.AddRule(rule);\n\n\trule = new Rule(\"SportsCar\");\n\trule.AddAntecedent(new IsClause(\"vehicleType\", \"automobile\"));\n\trule.AddAntecedent(new IsClause(\"size\", \"medium\"));\n\trule.AddAntecedent(new IsClause(\"num_doors\", \"2\"));\n\trule.setConsequent(new IsClause(\"vehicle\", \"Sports_Car\"));\n\trie.AddRule(rule);\n\n\trule = new Rule(\"Sedan\");\n\trule.AddAntecedent(new IsClause(\"vehicleType\", \"automobile\"));\n\trule.AddAntecedent(new IsClause(\"size\", \"medium\"));\n\trule.AddAntecedent(new IsClause(\"num_doors\", \"4\"));\n\trule.setConsequent(new IsClause(\"vehicle\", \"Sedan\"));\n\trie.AddRule(rule);\n\n\trule = new Rule(\"MiniVan\");\n\trule.AddAntecedent(new IsClause(\"vehicleType\", \"automobile\"));\n\trule.AddAntecedent(new IsClause(\"size\", \"medium\"));\n\trule.AddAntecedent(new IsClause(\"num_doors\", \"3\"));\n\trule.setConsequent(new IsClause(\"vehicle\", \"MiniVan\"));\n\trie.AddRule(rule);\n\n\trule = new Rule(\"SUV\");\n\trule.AddAntecedent(new IsClause(\"vehicleType\", \"automobile\"));\n\trule.AddAntecedent(new IsClause(\"size\", \"large\"));\n\trule.AddAntecedent(new IsClause(\"num_doors\", \"4\"));\n\trule.setConsequent(new IsClause(\"vehicle\", \"SUV\"));\n\trie.AddRule(rule);\n\n\trule = new Rule(\"Cycle\");\n\trule.AddAntecedent(new LessClause(\"num_wheels\", \"4\"));\n\trule.setConsequent(new IsClause(\"vehicleType\", \"cycle\"));\n\trie.AddRule(rule);\n\n\trule = new Rule(\"Automobile\");\n\trule.AddAntecedent(new IsClause(\"num_wheels\", \"4\"));\n\trule.AddAntecedent(new IsClause(\"motor\", \"yes\"));\n\trule.setConsequent(new IsClause(\"vehicleType\", \"automobile\"));\n\trie.AddRule(rule);\n\n\treturn rie;\n}\n```\n\nThe sample code below shows how to use forward chaining in the rule engine to derive more facts from the known facts using rules:\n\n```cs \nRuleInferenceEngine rie = getInferenceEngine();\nrie.AddFact(new IsClause(\"num_wheels\", \"4\"));\nrie.AddFact(new IsClause(\"motor\", \"yes\"));\nrie.AddFact(new IsClause(\"num_doors\", \"3\"));\nrie.AddFact(new IsClause(\"size\", \"medium\"));\n\nconsole.WriteLine(\"before inference\");\nconsole.WriteLine(\"{0}\", rie.Facts);\nconsole.WriteLine(\"\");\n\nrie.Infer(); //forward chain\n\nconsole.WriteLine(\"after inference\");\nconsole.WriteLine(\"{0}\", rie.Facts);\nconsole.WriteLine(\"\");\n```\n\nThe sample code below shows how to use the backward chaining to reach conclusion for a target variable given a set of known facts:\n\n```cs\nRuleInferenceEngine rie = getInferenceEngine();\nrie.AddFact(new IsClause(\"num_wheels\", \"4\"));\nrie.AddFact(new IsClause(\"motor\", \"yes\"));\nrie.AddFact(new IsClause(\"num_doors\", \"3\"));\nrie.AddFact(new IsClause(\"size\", \"medium\"));\n\nconsole.WriteLine(\"Infer: vehicle\");\n\nList\u003cClause\u003e unproved_conditions = new List\u003cClause\u003e();\n\nClause conclusion = rie.Infer(\"vehicle\", unproved_conditions);\n\nconsole.WriteLine(\"Conclusion: \" + conclusion);\n\nAssert.Equal(conclusion.Value, \"MiniVan\");\n```\n\nThe sample code below shows how to use the rule engine to ask more questions when it fails to reach conclusion for the target variable given a limited set of known facts:\n\n```cs\nRuleInferenceEngine rie = getInferenceEngine();\n\nconsole.WriteLine(\"Infer with All Facts Cleared:\");\nrie.ClearFacts();\n\nList\u003cClause\u003e unproved_conditions = new List\u003cClause\u003e();\n\nClause conclusion = null;\nwhile (conclusion == null)\n{\n\tconclusion = rie.Infer(\"vehicle\", unproved_conditions);\n\tif (conclusion == null)\n\t{\n\t\tif (unproved_conditions.Count == 0)\n\t\t{\n\t\t\tbreak;\n\t\t}\n\t\tClause c = unproved_conditions[0];\n\t\tconsole.WriteLine(\"ask: \" + c + \"?\");\n\t\tunproved_conditions.Clear();\n\t\tconsole.WriteLine(\"What is \" + c.Variable + \"?\");\n\t\tString value = Console.ReadLine();\n\t\trie.AddFact(new IsClause(c.Variable, value));\n\t}\n}\n\nconsole.WriteLine(\"Conclusion: \" + conclusion);\nconsole.WriteLine(\"Memory: \");\nconsole.WriteLine(\"{0}\", rie.Facts);\n```\n","funding_links":[],"categories":[],"sub_categories":[],"project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fchen0040%2Fcs-expert-system-shell","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fchen0040%2Fcs-expert-system-shell","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fchen0040%2Fcs-expert-system-shell/lists"}