Expert System

• Generic expert system to generate rules and create relation between entries and knowledge base.
• Implemented using Forward Chaining and Backward chaining.
• Require to input well-formatted json files that correspond to the example in data folder
• The clauses should relate to the Knowledge base or it won't make any sense when run.
• Parsers are built to parse the json file and create objects on runtime.

Description

• The Rule is a string that can be compared.
• Knowledge is formed up of multiple rules
• Knowledge Base is formed up of multiple knowledge
• Clause is a set of questions
• Clause has 3 attributes clause, negative, positive
• For each clause, the knowledge base is searched, percent higher than Min Match is outputted
• The constants can be changed from utils/constants.py
• Check out the examples data/

Thought process

• Json format file that can clearly define a structure to parse.

• Reading the json file and building the Knowledge Base and the Clause Base.

• The user input for each clause is converted to Knowledge Base.

• Both Knowledge bases are compared and max percent matched is outputted.

• There may be multiple matches, we could display details with percentage.

• Finally answer is either True or False.

• Knowledge base syntax

{
  "target": [
    {
      "name": "Kidney disease",
      "rules": {
        "1": "head aches",
        "2": "vomiting",
        "3": "body ache",
        "4": "no sleep"
      }
    },
    {
      "name": "Some target",
      "rules": {
        "1": "rule1",
        "2": "rule2"
      }
    }
  ]
}

• Clause base syntax

{
  "1": {
    "question": "State your symptoms?",
    "answer": {
      "positive": "Yes, you are positive for ",
      "negative": "We don't see any signs of "
    }
  },
  "2": {
    "question": "question/statement",
    "answer": {
      "positive": "positive statement with potential to add target at end",
      "negative": "negative statement, target will be added at end"
    }
  }
}

---

Example

• Backward Chaining

Chankya >>> Tell me some features of this bird?
You >>> high flight, strong legs, yellow legs
[DEBUG] Target :: Falcons, Eagles --->  Matched :: 33.33333333333333

[INFO] I am not sure if this is the bird Falcons, Eagles
[INFO] Hope that you are satisfied with your answers !

• Forward Chaining

Chankya >>> Tell me some features of this bird?
You >>> high flight, strong legs, yellow legs
[DEBUG] Target :: Falcons, Eagles --->  Matched :: 33.33333333333333
[DEBUG] Target :: Peacock --->  Matched :: 0.0
[DEBUG] Target :: Hen --->  Matched :: 0.0
[DEBUG] Target :: Albatrosses --->  Matched :: 0.0
[DEBUG] Target :: Paradise birds --->  Matched :: 0.0
[DEBUG] Target :: Crows --->  Matched :: 0.0
[DEBUG] Target :: Cuckoos --->  Matched :: 0.0
[DEBUG] Target :: Ducks, Geese and Swans --->  Matched :: 0.0

[INFO] I am not sure if this is the bird Falcons, Eagles
[INFO] Hope that you are satisfied with your answers !