The document describes different types of agents used in a tileworld simulation: reactive agents that respond to percepts in the environment, BDI agents that make decisions based on beliefs, desires, and intentions using memory, and a hybrid agent that combines the reactive and BDI approaches. It then analyzes the performance of these agent types in different configurations and demonstrates how multiple agents communicate and use memory.

1. Mason Tileworld
Presented to you by: Shenglong, Bing Zhe, Kah Yee, Clement, Vicky
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2. 
 Reactive Agent
 Practical Reasoning Agent – BDI
 Hybrid Agent
 Performance Analysis
 Communication and Memory
 Demonstration of hybrid agent
 Demonstration of multiple agents
Contents

3. 
 Respond to environmental changes via agent’s
percepts.
 It will always react to the nearest object.
 If distance to both tile and hole are the same, picking
up the tile will be of higher priority.
Reactive Agent

4. 
 It will make decisions based solely on the present
and does not consider past events.
 Memory is not utilized.
Limitations

5. 
 Decisions are made based on logical reasoning.
 Intentions are decided based on current situation.
 Plans are made based on past memory.
 BDI Agent improves Reactive Agent by
incorporating past memory for planning.
BDI Agent

6. 
 A vertical layering of Reactive Agent and BDI Agent.
Hybrid Agent

7. 
Reactive Agent BDI Agent Hybrid Agent
Configuration 1 9 20 24
Configuration 2 204 254 306
Performance Analysis
Configuration 1:
Environment Size : 100 x 100 cells
Average Object Creation Rate : Normal(μ=0.2, σ=0.05)
Lifetime : 100
Configuration 2:
Environment Size : 50 x 50 cells
Average Object Creation Rate : Normal(μ=2, σ=0.5)
Lifetime : 30

8. 
Performance Analysis
Hybrid Agent 1 Hybrid Agent 2 Total
Configuration 1 21 26 47
Configuration 2 308 298 606
Configuration 3 6 10 16
Configuration 3:
Environment Size : 150 x 40 cells
Average Tile Creation Rate : Normal(μ=0.02, σ=0.001)
Average Hole Creation Rate : Normal(μ=0.2, σ=0.01)
Average Obstacle Creation Rate : Normal(μ=0.5, σ=0.1)
Lifetime : 120

9. 
 Communication by sending “mail” to each other
 The mail contains 3 TWAgentPercept
 Sender’s target:
TWHole or TWTile (null if none)
 Sender itself as a percept
(For receiver to access sender location)
 TWHole nearest to the receiver
(With reference to sender’s memory)
Communication

10. 
 Memory of area in sensor range will be “refreshed”
 No memory decay function as deemed unnecessary
 Mail processing:
 TWHole percept from mail is added to memory
 Sender’s target is removed from memory unless
receiver position is closer to the target
Memory