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Consider the following simple planning problem in which the objective is to interchange the values of two variables v1 and v2 • Initial State: Value(v1, 3), Value(v2, 5), Value(v3, 0) • Goal: Value(v1, 5), Value(v2, 3) • Actions: o Assign(V, W, X, Y): • Preconditions: Value(V, X), Value(W, Y) · Effects: Value(V, Y), ¬Value(V, X) Given the Plan Space Planning Partial Plan below: → value(v1,3) • value(v1,5) ► value(v2,3) value(v2,5) assign(v1,v2,3,5) assign(v2,w,x,3) a. List all flaws (Open Goals and Threats) and in this partial plan b. Draw 1 possible solution starting with the above partial plan

Consider the following simple planning problem in which the objective is to interchange the values of two variables v1 and v2 • Initial State: Value(v1, 3), Value(v2, 5), Value(v3, 0) • Goal: Value(v1, 5), Value(v2, 3) • Actions: o Assign(V, W, X, Y): • Preconditions: Value(V, X), Value(W, Y) · Effects: Value(V, Y), ¬Value(V, X) Given the Plan Space Planning Partial Plan below: → value(v1,3) • value(v1,5) ► value(v2,3) value(v2,5) assign(v1,v2,3,5) assign(v2,w,x,3) a. List all flaws (Open Goals and Threats) and in this partial plan b. Draw 1 possible solution starting with the above partial plan

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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For part B, draw a solution that follows the Plan Space Planning Partial Plan

### Planning Problem: Interchanging Variable Values **Objective:** Interchange the values of two variables, v1 and v2. **Initial State:** - Value(v1, 3) - Value(v2, 5) - Value(v3, 0) **Goal:** - Value(v1, 5) - Value(v2, 3) **Actions:** - **Assign(V, W, X, Y):** - Preconditions: - Value(V, X) - Value(W, Y) - Effects: - Value(V, Y) - ¬Value(V, X) ### Plan Space Planning Partial Plan The diagram represents a partial plan illustrating the transformation steps involving actions to achieve the goal states. - **Nodes and Edges:** - **Start Node (a₀):** Represents the initial state. - **End Node (a∞):** Represents the goal state. - **Processes:** 1. **Assign(v1, v2, 3, 5):** - Input: - value(v1, 3) - value(v2, 5) - Output: - value(v1, 5) 2. **Assign(v2, w, x, 3):** - Transitions v2 from an intermediary state to the goal state. - **Links:** - Dashed arrows indicate preconditions for the actions and establish effects required to reach the end state. ### Tasks a. **List All Flaws (Open Goals and Threats) in this Partial Plan:** - Identify and list any preconditions not satisfied. - Address any potential threats to achieving the goal state. b. **Draw 1 Possible Solution Starting with the Above Partial Plan:** - Illustrate a sequence of actions that fulfills all preconditions and resolves threats, leading to the goal state.
Transcribed Image Text:### Planning Problem: Interchanging Variable Values **Objective:** Interchange the values of two variables, v1 and v2. **Initial State:** - Value(v1, 3) - Value(v2, 5) - Value(v3, 0) **Goal:** - Value(v1, 5) - Value(v2, 3) **Actions:** - **Assign(V, W, X, Y):** - Preconditions: - Value(V, X) - Value(W, Y) - Effects: - Value(V, Y) - ¬Value(V, X) ### Plan Space Planning Partial Plan The diagram represents a partial plan illustrating the transformation steps involving actions to achieve the goal states. - **Nodes and Edges:** - **Start Node (a₀):** Represents the initial state. - **End Node (a∞):** Represents the goal state. - **Processes:** 1. **Assign(v1, v2, 3, 5):** - Input: - value(v1, 3) - value(v2, 5) - Output: - value(v1, 5) 2. **Assign(v2, w, x, 3):** - Transitions v2 from an intermediary state to the goal state. - **Links:** - Dashed arrows indicate preconditions for the actions and establish effects required to reach the end state. ### Tasks a. **List All Flaws (Open Goals and Threats) in this Partial Plan:** - Identify and list any preconditions not satisfied. - Address any potential threats to achieving the goal state. b. **Draw 1 Possible Solution Starting with the Above Partial Plan:** - Illustrate a sequence of actions that fulfills all preconditions and resolves threats, leading to the goal state.
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