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Artificial Intelligence By Mr. Ejaz CIIT Sahiwal.

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Presentation on theme: "Artificial Intelligence By Mr. Ejaz CIIT Sahiwal."— Presentation transcript:

1 Artificial Intelligence By Mr. Ejaz CIIT Sahiwal

2 Artificial Intelligence Course outline Introduction Problem solving Generic algorithms Knowledge Representation and Reasoning Expert Systems Uncertainty Learning Planning Advanced topics in AI CIIT Sahiwal

3 Artificial Intelligence Problem Solving and Search Muhammad Ejaz CIIT Sahiwal

4 Problem Solving The mechanism to find the goal performing some actions to transit from one state to another is known as problem solving. Initial state Operator: description of an action State space: all states reachable from the initial state by any sequence action Path: sequence of actions leading from one state to another Goal test: which the agent can apply to a single state description to determine if it is a goal state Path cost function: assign a cost to a path which the sum of the costs of the individual actions along the path. CIIT Sahiwal

5 Different types of problem Well structured problems  When problem description and its rules are described clearly and unambiguously. Ill structured problem  No extra information about the problem other than the definition No extra information No heuristics (rules) Well structured problems  When problem description and its rules are described clearly and unambiguously. Ill structured problem  No extra information about the problem other than the definition No extra information No heuristics (rules) CIIT Sahiwal

6 Well Defined Problems Finding the maximum from a sequence of integers. Eight puzzle 1,2 or 2,1 puzzle Farmer and goose problem Water pouring problem CIIT Sahiwal

7 Eight puzzle CIIT Sahiwal

8 Water Pouring Problem CIIT Sahiwal

9 Farmer and goose problem W F ~ W F G F W F G ~ G F ~ W C W C C ~ G F G ~ C F ~ W C F ~ C F W W G ~ G G ~ G C C C F C W ~ G W CIIT Sahiwal

10 Think Point What will be tree representation of Farmer and goose problem? CIIT Sahiwal

11 Searching For Solutions Having formulated some problems…how do we solve them? Search through a state space Use a search tree that is generated with an initial state and successor functions that define the state space CIIT Sahiwal

12 Different search techniques Uninformed Search  Only the information available in the problem definition – Also known as blind searching -Breadth-first search -Depth-first search -Depth-limited search -Iterative deepening search Informed Search  When sufficient information is provided to reach the goal. CIIT Sahiwal

13 Breadth-First Search Recall from Data Structures the basic algorithm for a breadth-first search on a graph or tree Expand the shallowest unexpanded node Place all new successors at the end of a FIFO queue CIIT Sahiwal

14 Breadth-First Search CIIT Sahiwal

15 Breadth-First Search CIIT Sahiwal

16 Breadth-First Search CIIT Sahiwal

17 Breadth-First Search CIIT Sahiwal

18 Depth-First Search Recall from Data Structures the basic algorithm for a depth-first search on a graph or tree Expand the deepest unexpanded node Unexplored successors are placed on a stack until fully explored CIIT Sahiwal

19 Depth-First Search CIIT Sahiwal

20 Depth-First Search CIIT Sahiwal

21 Depth-First Search CIIT Sahiwal

22 Depth-First Search CIIT Sahiwal

23 Depth-First Search CIIT Sahiwal

24 Depth-First Search CIIT Sahiwal

25 Depth-First Search CIIT Sahiwal

26 Depth-First Search CIIT Sahiwal

27 Depth-First Search CIIT Sahiwal

28 Depth-First Search CIIT Sahiwal

29 Depth-First Search CIIT Sahiwal

30 Depth-First Search CIIT Sahiwal


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