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# Questions tagged [constraint-satisfaction-problems]

For questions about constraint satisfaction problems (CSPs), which are usually described by a set of variables, a set of domains, and a set of constraints. For more details, see, for example, chapter 6 of the book "Artificial Intelligence: A Modern Approach" (3rd Edition) by Stuart Russell and Peter Norvig.

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### Minimum remaining values heuristic more powerful than degree heuristic

When selecting a new variable to assign a value to in CSP assignment backtracking search, common heuristics include: MRV heuristic: pick the unassigned variable with the fewest remaining values in ...
3k views

### What is local consistency in constraint satisfaction problems?

In the Constraint Propagation in CSP, it is often stated that pre-processing can solve the whole problem, so no search is required at all. And the key idea is local consistency. What does this ...
1 vote
304 views

### What is exactly the role of commutative property in a Constraint Satisfaction Problem?

I have been looking into the backtracking search for CSPs, and understand that if we just plainly do a typical depth-limited search we have a vast tree with leaves size $n!d^n$ where $n$ is the number ...
18 views

### Ideal method for finding function that satisfies a set of constraints

I'm new to playing around with deep learning. I'm trying to find a function that satisfies a bunch of constraints, and looking for tips on how to better my approach. Let $F:X\times Y \mapsto [0,1]$, ...
1 vote
37 views

### Finding resulting domains after enforcing arc consistency

This question is about the below exam scheduling constraint satisfaction graph, where each node represents a course. Each course is associated with an initial domain of possible exam days (most ...
39 views

### Inquiry about utilising AI in CNC machining path generation

I will begin by describing a situation. I work in laser machining control company. The essence of the problem, to which I would like to try to apply AI based tool is this: Say I have a analytically ...
535 views

### How can I develop a genetic algorithm with a constraint on the sum of alleles?

I'm working on a genetic algorithm with a constraint on the sum of the alleles, e.g. if we use regular binary coding and a chromosome is 5-bits long I'd like to constrain it so that the sum of the ...
26 views

### Is there a chess engine whose architecture is composed purely of ranked/weighted constraints that then generate candidate moves for search?

Chess can be seen as a search for a move with many constraints on it. In the human way of searching for a move, we think to ourselves something like "I need to find a move that both moves the ...
1 vote
171 views

### What's wrong with my answer to this constraint satisfaction problem, which needs to be solved the AC-3 algorithm?

I was watching the video Constraint Satisfaction: the AC-3 algorithm, and I tried to solve this question: Given the variables A, B, C and D, with domain {1, 2, 3, 4} in each of them and restrictions ...
1 vote
4k views

### How to improve the efficiency of the backtracking search in CSPs?

Backtracking search is the basic uninformed search algorithm for constraint satisfaction problems (CSPs). How could we improve the efficiency of the backtracking search in CSPs?
30 views

### How to create a loss function that penalizes duplicate indices in the output tensor?

We're working on a sequence-to-sequence problem using pytorch, and are using cross-entropy to calculate the loss when comparing the output sequence to the target sequence. This works fine and ...
1 vote
178 views

### What is my mistake in applying the AC-3 algorithm on this problem?

I want to apply AC-3 algorithm to the following CSP: There are two variables $A$ and $B$. Domain of $A: \{0, 1, 2, 3, 4, 5, 6, 7, 8, 9\}$ Domain of $B: \{0, 1, 2, 3, 4, 5, 6, 7, 8, 9\}$ The ...
336 views

### How can I formulate a nonogram problem as a constraint satisfaction problem?

I've just started learning CSP and I find it quite exciting. Now I'm facing a nonogram solving problem and I want to solve it using backtracking with CSP. The first problem that I face is that I ...
1 vote
47 views

### How to handle equality constraints in the mutation operation of evolutionary algorithms?

I am new in evolutionary algorithms field. I have a chromosome of 6 variables (real variable), where the sum of these variables is equal to 1. I am looking for mutation formulas that can generate a ...
311 views

### Understanding conflict set generation for conflict directed backjumping

I was reading Constraint Satisfaction Problem chapter from Artificial Intelligence 3rd ed book by Peter Norvig et al. On page 219, section 6.3 it explains computation of conflict set for conflict ...
7k views

### What is a successor function (in CSPs)?

In Constraint Satisfaction Problems (CSPs), a state is any data structure that supports a successor function, a heuristic function, and a goal test. In this context, what is a successor function?
139 views

### What AI technique should I use to assign a person to a task?

I'm trying to learn AI and thinking to apply it to our system. We have an application for the translation industry. What we are doing now is the coordinator $C$ assigns a file to a translator $T$. The ...
1 vote
31 views

### CSP heuristic to simultaneously reduce conflicts and find near optimal assignment

I am trying to design a good heuristic to solve a constraint satisfaction problem (CSP). I think that a possible heuristic to use is $$h_1(\text{state}) = \text{number of conflicts in state}$$ However,...
269 views

### Have evolutionary algorithms been used for engineering design?

Recently, I've been looking recently into what uses AI - specifically evolutionary algorithms - may have in automating engineering design. For a long time, there have been algorithms that solve ...
245 views

### What is the goal of a constraint solver?

What is the goal of a constraint solver? How are constraints propagated in a constraint satisfaction search? Any references are also appreciated.
1k views

### What are the differences between constraint satisfaction problems and linear programming?

I have taken an algorithms course where we talked about LP significantly, and also many reductions to LPs. As I recall, normal LP is not NP-Hard. Integer LP is NP-Hard. I am currently taking an ...
117 views

### Which algorithm can I use to solve a problem with multiple objectives and constraints?

Consider a problem with many objectives. In my case, these are school grades for different courses (or subjects). To be more concrete, suppose that my current grade for the math course is $12/20$ and ...
1 vote
26 views

### How can I design a system that suggests physical exercises to a person while keeping into account the fatigue?

I want to create an exercise suggester. Each day either has a routine or is a rest day. A routine has 4 slots. For each slot we select an exercise. We constrain the legal exercises, only do upper-body ...
1 vote
44 views

### How do I decide which norm to use for placing a constraint on my adversarial perturbation?

I am performing an adversarial machine learning attack on a neural network for network traffic classification. For adding adversarial perturbations in features such as packet interarrival times and ...
1 vote
46 views

### Where can I find example data for Nonogram solver?

I made CSP nonogram solver and I wanna test it on some bigger data. Where can I find such data to test my program? I've been looking on the internet but I couldn't find anything.
1k views

### Can the degree and minimum remaining values heuristics be used in conjunction?

I am currently studying constraint satisfaction problems and have come across two heuristics for variable selection. The minimum remaining values(MRV) heuristic and the degree heuristic. The MRV ...
120 views

### How can I assign agents to tasks based on time and affinity?

I am working on an assignment problem. Consider $K$ agents $A_1, \dots A_K$ and $N$ tasks $T_1, \dots T_N$. Each task has a certain time $t(T_i)$ to be completed and each agent has a matching (or ...
3k views

### How can I formulate the k-knights problem as a constraint satisfaction problem?

There are three things in every constraint satisfaction problem (CSP): Variables Domain Constraints In the given scenario, I know how to identify the constraints, but I don't know how to identify ...
327 views

### What are daily life examples of SAT problems?

What are (good) daily life examples of SAT problems? I've thought about this one. The problem of placing a bunch of different kinds of glasses in a shared cabinet in such a way that some constraints ...
Given $F_1,F_2,..,F_n$ as set of final exams of subjects taken by students $S_1,..,S_k$ in h slots such that no student takes two exams in a single slot.Here the objective is to maximize the number of ...