Assignment 1

Uninformed & Informed Search

Max possible score:

• 4308: 100 Points [+40 Points EC]
• 5360: 100 Points

Task 1 (This task will be used as part of the ABET assesment for CSE 4308 students)

Max: [4308: 100 Points, 5360: 100 Points]

Your task is to build an agent to solve a modifed version of the 8 puzzle problem (called the Expense 8 puzzle problem). The task is still to take a 3X3 grid on which 8 tiles have been placed, where you can only move one tile at a time to an adjacent location (as long as it is blank) and figure out the order in which to move the tiles to get it to a desired configuration. However now the number on the tile now also represents the cot of moving that tile (moving the tile marked 6 costs 6).

Your program should be called expense_8_puzzle and the command line invocation should follow the following format:

expense_8_puzzle.py

• and are required.
• can be
• bfs - Breadth First Search
• ucs - Uniform Cost Search
• dfs - Depth First Search
• dls - Depth Limited Search (Note: Depth Limit will be obtained as a Console Input) [Note: This part is EC for CSE 4308 students]
• ids - Iterative Deepening Search [Note: This part is EC for CSE 4308 students]
• greedy - Greedy Seach
• a* - A* Search (Note: if no is given, this should be the default option)
• If is given as true, search trace is dumped for analysis in trace--.txt (Note: if is not given, assume it is false)
• search trace contains: fringe and closed set contents per loop of search(and per iteration for IDS), counts of nodes expanded and nodes

Both start file and goal file need to follow the format as shown here:

• Sample Start file
• Sample Goal file

Your output needs to follow the format given in the example here:

For:

expense_8_puzzle.py start.txt goal.txt a* true

The output should appear as follows:

Nodes Popped: 97
Nodes Expanded: 64
Nodes Generated: 173
Max Fringe Size: 77
Solution Found at depth 12 with cost of 63.
Steps:
Move 7 Left
Move 5 Up
Move 8 Right
Move 7 Down
Move 5 Left
Move 6 Down
Move 3 Right
Move 2 Right
Move 1 Up
Move 4 Up
Move 7 Left
Move 8 Left

In additon, the seach trace should have all the information contained in the file given here. (The format is not important, the information is)

Note: for both greedy and A* search you need to come up with a acceptable heuristic (Hint: Consider a modified version of h2 as discussed in class)

Note: Implementing DLS and IDS is required for CSE 5360 students but optional for CSE 4308 students (and carries upto 40 points EC)