Lesson 6 - Production Systems

Question 1

What is the function of a Cognitive Architecture?

Answer 1

It’s a function that maps a perceptual history into an action.

f: P* -> A
- Where the asterisk stands for the history of percepts
- The tasks of cognitive agents is to select an action.

Question 2

What are the levels of cognitive architectures?

Answer 2

Task/Knowledge Level

• Highest Level
• Ex: selecting a pitch, playing baseball
• Content for below

Algorithm / Symbol Level

• Ex: means-ends analysis, semantic networks
• Architecture for above
• Content for below

Hardware / Implementation Level

• Ex: a brain, a transistor
• Architecture for above

Question 3

What is Behavior?

Answer 3

Behavior = Architecture + Content

Question 4

What is an example of a Cognitive Architecture for Production Systems?

Answer 4

Ex: SOAR

• Consists of long term memory and working memory
• Working memory changes often, long term memory doesn’t.
• 3 kinds of long term memory:
  1) Procedural -> how to do certain things
• Represented in the form of production rules.
  2) Semantic -> generalizations
  3) Episodic -> Evens

Question 5

What is Action Selection?

Answer 5

It’s the process of creating a decision tree and setting up the state space, operators, and the corresponding features/values.

Question 6

What is chunking?

Answer 6

Occurs when there is an impasse. To break the impasse, SOAR will attempt to learn a rule by pulling from “Episodic” knowledge.