This document discusses case-based reasoning, which is an approach to solving new problems by adapting solutions from similar past problems. It describes the key components of a case-based reasoning system, including the case base, case representation, and the four-step CBR life cycle of retrieve, reuse, revise, and retain. An example of using CBR for loan approval decisions is provided based on two factors: net monthly income and monthly loan repayment amount. Advantages of CBR being able to quickly propose solutions and not requiring complete domain understanding are contrasted with potential disadvantages of poor old cases, a biased case library, and failure to retrieve the most appropriate case.

1. MAHARSHI DAYANAD SARSWATI
UNIVERSITY,AJMER,RAJ.
Name: Astha Parihar
Class: M.Tech Semester 2
Subject: Machine Learning

2. Case Based Reasoning

3. CASE BASE
• A case base is set of cases.
• Case base is usually just flat files or relational database.

4. INTODUCTION
• Case-based reasoning (CBR) is an experience-based approach to
solving new problems by adapting previously successful solutions to
similar problems.
• Addressing memory, learning, planning and problem solving, CBR
provides a foundation for a new technology of intelligent computer
systems that can solve problems and adapt to new situations.
• Case-based reasoning can be used for classification and regression.

5. CBR Life Cycle

6. 1.Retrieve: Determine most similar cases.
2.Reuse: Solve the new problem reusing information and
knowledge in the retrieved case.
3.Revise:Evaluating the use of the solution in the new context.
4.Retain:Storing this new problem-solving method in the
memory system.

7. Example
• imagine a decision with two factors that influence it
• should you grant a person a loan?
 ❶ net monthly income
 ❷ monthly loan repayment

8. Fig. 1 Fig. 2

9. Old Cases
New Cases
Fig.3
Fig.4

10. Fig.5

11. ADVANTAGES
• Solution are quickly proposed.
• Domain need not to be completely understood.

12. DISADVANTAGES
• Old cases may be poor.
• Library may be biased.
• Most appropriate case may not be retrieved.

13. Thank You