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Rational Agents

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title: Rational Agents
categories: session

# Preparation

*Reading* Russel & Norvig Chapter (1-)2

# Learning outcomes

After the completion of this workshop, students should

+ be familiar with CodinGame and have successfully solved some of the recommended Medium puzzles.
+ be able to analyse problems with respect to PEAS (performance measure, environment, actuator, sensor).
+ understand and be able to explain what kind of agent they have implemented (e.g., reflex agent, planning agent, etc.) and whether their agents (or more generally, solution methods) are rational.
+ be familiar on an introductory level with basic data structures and algorithms (e.g., lists, sets, trees, binary search, greedy search).
+ be able to understand and answer the sample exam questions posted on Blackboard that relate to the material covered in this workshop.

# Briefing

## Module evaluation

+ Status report.
+ Questions and Answers?

## Recap from last week

We discuss the content from R&N Ch. 1.

**TODO** review

+ four definitions of AI along the axes of thinking and acting humanly and rationally.
+ foundations of AI, e.g., philosophy, mathematics, economics, neuroscience, psychology, computer engineering, control theory and cybernetics, linguistics
+ the history of AI
+ applications of AI and state-of-the-art

We divide the class into four groups for each of the talking points.
You can use OneNote to enter some notes from your brainstorming.
Finally, each group present briefly their topic before a short discussion and comments from the class and teacher.

## Lecture

See [Lecture on Rational Agents]()

## Discussion 

We discuss the content presented by R&N Ch. 2.

+ definition of agent 
+ percept and percept sequence
+ agent function and agent program
+ rational agents and performance measures
+ omniscience, learning, and autonomy
+ task environments and PEAS
+ properties of task environments
+ table-driven agents
+ simple reflex agents
+ model-based reflex agents
+ goal-based agents
+ utility-based agents
+ learning agents

Working in pairs, each student in a pair will get 10 mins to prepare a talking point from the list, before giving a short oral presentation to the other student, and vice versa. 
This is called *peer-tutoring*.
Afterwards, we will discuss the exercise and clarify certain topics and questions you might have (if any).

## End-of-chapter exercises in AIMA Ch. 2

Working individually or in pairs, students will be assigned an exercise from the end-of-chapter exercises in AIMA Ch. 2.
After having worked on the problem for a little, with notetaking in OneNote, the worked solutions will be presented to the rest of the class.

# Exercises

We continue solving coding challenges primarily on CodinGame. 
As we progress, try to draw a connection between the coding challenges and the topics we learn. 
Some help on particular puzzles is provided in the Forum on Blackboard. 

## Preliminaries

Note that knowledge about various data structures and trees, in particular, binary search trees, will be useful before implementing algorithms presented in this course.
You should explore such functionality in your programming language of choice,
e.g., in Java, the 
[Collections Framework](
includes various useful interfaces and classes, e.g.

+ Set: HashSet, TreeSet, LinkedHashSet
+ List: ArrayList, LinkedList
+ Deque: ArrayDeque, LinkedList
+ Map: HashMap, TreeMap, LinkedHashMap

## Challenges

In CodinGame, the following challenges may be useful:

### Intelligent Agents

+ [Shadows of the Knight Episode 1]( (medium): intervals, binary search
    + Intelligent Agent
    + Some similarities with the Þor problem last week, but this time the target location is not precisely known
+ [Bender Episode 4](
    + This is a challenge.  You have to take care to build the model
      and the search tree.
    + Note that you have to find the entire path in your model, and then
      execute your program.  You cannot use a perception loop to try and err.
    + Work in **groups**.  Discuss the model and make sure you can agree on
      an understanding.
    + Previous episodes no longer available

### Algorithmic Challenges

+ [There is no Spoon]( (medium): lists
    - Search problem - no intelligent agent
    - Using lists is not the only solution
+ [Telephone Numbers]( (medium): trees, sets
    - calculation - no intelligent agent
    - modelling challenge 
    - many solutions - can be simulated
+ [Advanced tree]( (medium): tree
    - Build and print a tree
    - No intelligent agent
+ [The Gift]( (medium): greedy algorithms
    + Mathematical problem

### Unsorted 

+ Skynet Revolution* (medium): BFS, graphs

Note that Skynet Revolution goes a step further into breadth first search (BFS),
which is presented first in R&N Ch. 3.
Also, note that you may have to complete a number of prerequisite Easy challenges 
to *unlock* the above challenges.

# Homework

Prepare yourself for the next workshop by doing the following:

1.  Review the reading material for this class.
2.  Do the preparation for the next lecture, on [Search]().