The document outlines how to implement expert systems using two platforms: CLIPS, a rule-based programming language, and Experta, a Python library inspired by CLIPS. It discusses the differences between the two, including their installation and how to create facts and rules in Experta. Facts serve as the basic unit of information, while rules define conditions and actions for system responses.

1. Intelligent information
systems
“ lab1”

2. Expert Systems

5. How To Implement an expert system
 CLIPS
 Python

6. CLIPS
 a rule based programming language
‑
Written in C
 CLIPS is an abbreviation to the C
Language Integrated Production System
 useful for creating expert systems and
other programs where a heuristic solution
is easier to implement and maintain than
an algorithmic solution

7. Experta
Pyknow
 Experta is a Python library for building expert systems
strongly inspired by CLIPS
the goal of making it easy for the CLIPS programmer to
transfer all of his/her knowledge to this platform.
Difference between CLIPS and Experta
• CLIPS is a programming language, Experta is a Python
library.
• CLIPS is written in C, Experta in Python
• In CLIPS you add facts using assert, in Python we
use declare instead

8. Experta
Installation
 To install Experta, run this command in your terminal:
 pip install experta
 Pip  python installer
package

9. Facts
 Facts are the basic unit of information of Experta. They
are used by the system to reason about the problem.
 The class Fact is a subclass of dict.
 from experta import *
 f = Fact(a=1, b=2)

10. Facts
 In contrast to dict, you can create a Fact without keys
(only values), and Fact will create a numeric index for
your values.
 f2 = Fact('x','y','z')
 You can mix autonumeric values with key-values, but
autonumeric must be declared first:
f3 = Fact('x','y','z',a=1,b=2)

12. Facts
 You can subclass Fact to express different kinds of data
or extend it with your custom functionality.
class Alert(Fact):
"""The alert level."""
pass
class Status(Fact):
"""The system status."""
pass
f1 = Alert('red‘, ‘noise’)
f2 = Status('critical')

14. Rules
 In Experta a rule is a callable, decorated with Rule.
 @Rule
 Rules have two components, LHS (left-hand-side) and
RHS (right-hand-side).
 The LHS describes (using patterns) the conditions on
which the rule should be executed (or fired).
 The RHS is the set of actions to perform when the rule
is fired.

15. Rules
@Rule(Fact('animal', family='felinae')) # This is the LHS
def match_with_cats(): # This is the RHS
"""
Match with every `Fact` which:
* f[0] == 'animal'
* f['family'] == 'felinae'
"""
print("Meow!")

16. Rules