Questions tagged [genetic-algorithms]
For questions related to genetic algorithms (GAs), which are a form of evolutionary algorithms. A genetic algorithm is a method (more precisely, a metaheuristic) for solving optimization and search problems based on natural selection processes (that is, they use bio-inspired operators such as mutation, crossover, and selection).
177
questions
0
votes
0
answers
12
views
Best fitness function for car driving around a procedural race track?
I am using the NEAT algorithm to power a car around a procedural race track. Each generation, a new track is created to avoid the car overfitting the environment.
The aim is for the car to drive ...
0
votes
0
answers
12
views
How to approach a student planning problem?
Suppose we have a couple of hundred students that each can select one or two subjects to follow, e.g., math and history. Each student can only attend a single class for each subject. Each student also ...
- 101
0
votes
0
answers
27
views
How to evaluate a neural network that has recurrent connections
I was attempting to implement NEAT but I am facing a slight problem.
how can I get the order for which to calculate the output of each neuron with recurrent connections present?
I thought if a method ...
0
votes
0
answers
34
views
Which of these 3 mutation rates is the best in terms of performance?
I am need some comments since I am conducting experiments with 3 different mutation rates and hesitate to choose the best one.
I ...
- 101
2
votes
2
answers
72
views
How should I train the players in the game of tag?
I have a simple game of tag, where red player tries to catch the blue player. Red player wins if it catches the blue player in under 10 seconds, but if not, then blue wins.
My goal is to teach the ...
- 143
0
votes
1
answer
60
views
Crossover and Mutation function for value encoding [closed]
I have been trying to attempt writing a Genetic Algorithm using value encoding (fixed-length vectors of real numbers) instead of binary encoding. So far the code I have written works, but needs quite ...
- 1
0
votes
0
answers
26
views
agent based DNN with a loopback
I have a data problem with no direct reward mechanism,(test/train) good and fault solutions.
Though over a long time period good decisions might be made.
I've been searching for days now for an agent ...
- 101
0
votes
2
answers
64
views
What is it meant by "cannot use gradients" in Genetic Algorithms?
While reading a book on introduction to GA, I stepped upon a chapter where some advantages and disadvantages of these algorithms were described. One of the mentioned disadvantages was "Cannot use ...
- 103
0
votes
1
answer
123
views
how to apply crossover and mutation rates in genetic algorithm?
I'm working with genetic programming and let's say I have the following operator:
pop_size = 100
Crossover ratio = 0.4
Mutation Ratio = 0.2
Selection Ratio = 0.1
What is exactly the next generation ...
- 1
1
vote
0
answers
36
views
Is there anything remotely as successful as backprop, but for training programs, not neural networks?
Backprop is used to train deep neural networks to remarkable success. Deep neural networks, on the other hands, can be seen as as a specific kind of computer function that receives inputs and produces ...
- 245
1
vote
1
answer
40
views
AIMA, Mutation in Genetic Algorithm
With regards to the highlighted line, the authors earlier stated that:
The mutation rate, which determines how often offspring have random mutations to
their representation. Once an offspring has ...
- 13
3
votes
2
answers
140
views
Do genetic algorithms "learn"?
I am currently working my way into Genetic Algorithms (GA). I think I have understood the basic principles. I wonder if the time a GA takes to go through the iterations to determine the fittest ...
anon
0
votes
1
answer
169
views
How to define a fitness function to make sure the best fitness value is 'close to 9' in genetic algorithm
I am learning about genetic algorithms (GA), but I encountered a question about the definition of the fitness function used in GA.
I understand that the fitness function should return a scalar value (...
- 1
1
vote
1
answer
95
views
What type of neural network has an unorganized structure?
I am looking for a network that has an unorganized structure like this, is feed-forward, does not have back-propagation functionality, and is trained with a genetic algorithm.
What would I be looking ...
- 17
1
vote
0
answers
33
views
Why we need to do mutation after crossover? [duplicate]
I am reading about genetic algorithms.
In the genetic algorithm process we perform crossover and mutation.
However, in the crossover, we already produce offspring, so then why do we also need to ...
- 111
2
votes
1
answer
52
views
Does pairing children with their parents cause any harm (in a genetic program)?
If you pair parents with their children (with a cross-over) does this prevent making individuals which are more fit or does this cause other side effects which are harmful to the genetic process?
I ...
- 131
0
votes
0
answers
49
views
How would you find the fitness function for the following puzzle?
A magic hexagon is a hexagon whose sum of each row and diagonal equals to a constant. I am currently searching a magic hexagon of order 3 with the magic constant = 38. I am using a genetic algorithm ...
- 19
2
votes
1
answer
51
views
How to decode P bits that represent a random weight generator?
So I've been tasked by my neural network professor at university to replicate the following research: Intelligent Breast Cancer Diagnosis Using Hybrid GA-ANN.
Each chromosome represents a possible net,...
- 21
0
votes
0
answers
29
views
In NEAT, how do I prevent duplicate connections?
According to this paper, duplicate mutations are only given the same innovation numbers within the same generation. What do I do if a connection gets broken into 2 connections and a node during 2 ...
1
vote
0
answers
174
views
How to calculate adjusted and normalized fitness when a higher raw fitness is better
I am reading Genetic Programming: On the Programming of Computers by Means of Natural Selection by John R. Koza.
For calculating the "standardized fitness" of an individual, where a lower ...
- 123
1
vote
0
answers
182
views
Why does the schema theorem of genetic algorithms hold?
I have been reading about the Schema Theorem - one of the first theorems from the field of evolutionary computing and genetic algorithms, largely responsible for justifying the use of genetic ...
- 249
1
vote
0
answers
36
views
Would it be a good idea to mutate half of the offspring of each GA generation 100% of the time and the other half 0% of the time?
I was reading about genetic algorithms, and to my understanding a genetic algorithm (GA) is an algorithm that starts with an initial population of chromosomes, where each chromosome has associated ...
- 111
4
votes
1
answer
169
views
Are Genetic Algorithms suitable for a problem with a non-unique optimal solution?
I was wondering if a genetic algorithm is useful if the optimization problem has several optimal solutions.
My thought was that I should not use it since when combining two members of a population who ...
- 141
1
vote
1
answer
58
views
Is there a crossover that also considers that every index in the vector also influences the fitness function?
Is there a crossover that also considers that every index in the vector also influences the cost function?
I have two vectors $v_1=[A_1, A_2, A_3, A_4, A_5]$ and $v_2=[A_5, A_3, A_2, A_1, A_4]$.
The ...
- 103
1
vote
1
answer
177
views
In the NEAT algorithm, what is the purpose of treating disjoint and excess genes differently?
In the NEAT algorithm, what is the purpose of treating disjoint and excess genes differently?
They are treated so (or may be treated potentially) at least when calculating the distance between 2 ...
- 75
1
vote
1
answer
67
views
What exactly is the population in the problem of finding the best path in a network of nodes using genetic algorithms?
I have 17 nodes in my network with 3000 different paths in total. I have to select the path with highest available bandwidth, using genetic algorithm. I'm confused about the approach! Should I have ...
- 11
2
votes
0
answers
107
views
In NEAT, how do node numbers work?
I have read a lot of debates about node ids and such. I'm not 100% sure how it works, but I am assuming the next node added to a network would be the next number in that specific networks list?
For ...
- 51
3
votes
0
answers
63
views
How does the paper implement NEAT without a global set tracking Innovations?
I have been reading this paper on NEAT and trying to implement the algorithm in C#. For the most part, I understand everything in the paper however, there are 2 things I don't understand that confuse ...
- 51
4
votes
1
answer
186
views
Does elitism cause premature convergence in genetic algorithms?
I have a genetic algorithm which is working fairly well. It's got all the standard operators, including initial random population, crossover ratio, mutation rate, degree of mutation, etc.
This works ...
- 149
0
votes
1
answer
291
views
Is a genetic algorithm efficient for a snake game?
I am working on a DIY project in which I want to be able to train a neural network to play Snake.
Is a genetic algorithm an efficient way of training a network for this application?
For a GA, what ...
- 1
2
votes
1
answer
187
views
What is the most computationally efficient genetic algorithm?
In researching genetic algorithms, it seems that there are various methods of selection and other operator methods that can significantly change the performance. For example, this picture contains ...
- 23
1
vote
1
answer
101
views
How to design fitness function for multiple objectives?
I am currently building a neural network with genetic algorithms that learns to fly a 2D drone to a target. My goal is that it achieves all tasks as fast as possible, but I want the drone to also fly ...
- 13
1
vote
1
answer
37
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 ...
0
votes
1
answer
189
views
Is it possible to optimize a multi-variable function with a reinforcement learning method?
I want to use RL instead of genetic or any other evolutionary algorithm in order to find the best parameter for a function.
Here is the problem:
Given a function $$f(x,y,z, \text{data}),$$
where $x$, $...
1
vote
0
answers
77
views
How should the 1-point crossover and mutation be defined for the problem of finding the largest circle that does not enclose any point?
For a random scattering of points, in a bounded area, the goal is to find the largest circle that can be drawn inside those same bounds that does not enclose any points. Solving this problem with a ...
- 215
0
votes
0
answers
151
views
How can I select features for a symbolic regression problem to be solved with genetic programming?
I want to solve a symbolic regression problem with genetic programming. My dataset is similar to this one, but I have 30 features, and I want to use only the most sensitive features. I found this ...
- 51
1
vote
1
answer
399
views
How to deal with evolutionary/genetic fitness function that can have both negative and positive values?
I am optimising function that can have both positive and negative values in pretty much unknown ranges, might be -100, 30, 0.001, or 4000, or -0.4 and I wonder how I can transform these results so I ...
- 1,240
1
vote
0
answers
44
views
If one of the inputs to a neural network (that represents a policy) is noisy and degrades the performance, would this architecture solve the issue?
I'm using genetic algorithms to train deep reinforcement learning (DRL) agents, similarly to what was done in this paper. DRL policies are therefore represented by deep neural networks, which map ...
- 229
0
votes
1
answer
155
views
How to design a fitness function for a problem where there are 2 objectives?
I am told to express a fitness function for a question I have been presented. I am unsure how I would express the function. In words, what I have written down makes sense but turning this into a ...
user43972
3
votes
1
answer
195
views
Are Genetic Algorithms suitable for problems like the Knuth problem?
We all know that Genetic Algorithms can give an optimal or near-optimal solution. So, in some problems like NP-hard ones, with a trade-off between time and optimal solution the near-optimal solution ...
- 217
0
votes
2
answers
90
views
How to detect that the fitness landscape of a genetic algorithm is changing over time?
I understand that in each generation of a genetic algorithm, that generation must re-prove it's fitness (and then the fittest of that population is taken for the next population).
In this case, I ...
- 277
2
votes
2
answers
315
views
Are there any disadvantages to using a variable population size in genetic algorithms?
When implementing a genetic algorithm, I understand the basic idea is to have an initial population of a certain size. Then, we pick two individuals from a population, construct two new individuals (...
- 277
3
votes
1
answer
72
views
Is it possible that the fittest individuals in an Artificial Life population may be successful by not actively pursuing the rules of the environment?
I'm trying to understand Artificial Life (e.g. here for a simple background) in Computational Evolution.
I understand that in this set of methods, you set up a dynamic environment (e.g. the ecology of ...
- 277
2
votes
1
answer
819
views
What is the impact of changing the crossover and mutation rates?
What is the impact of using a:
low crossover rate
high crossover rate
low mutation rate
high mutation rate
- 131
1
vote
1
answer
45
views
Is there some known pattern for selecting a batch of candidates for the next generation?
I'm a beginner with a classic "racing car" sandbox and a homemade simple neural network.
My pattern:
Copy the "top car" (without mutation) to the next generation
If there are ...
- 163
1
vote
1
answer
293
views
What is the difference between sensitivity analysis and parameter tuning?
I tried different values of genetic algorithm operators:
many crossover rates from 20% to 80%
many crossover rates from 1% to 20%
varying the population size
The study of different parameter values ...
- 131
0
votes
0
answers
131
views
Genetic algorithm stuck and cannot find an optimal solution
I'm working on SLAP (storage location assignment problem) using genetic algorithm implemented manually in the C++ programming language. The problem is fairly simple, we do have ...
- 213
0
votes
0
answers
47
views
Unable to meet desired mean squared error
I wish to get MSE < 0.5 on test data (https://easyupload.io/zr7xf3) which is 20% of given data chosen randomly. But I am reaching 0.73 using both plain Ridge Regression as well as a neural network ...
- 1
3
votes
2
answers
334
views
Is it possible to perform neuroevolution without a fitness function?
My question is about neuroevolution (genetic algorithm + neural network): I want to create artificial life by evolving agents. But instead of relying on a fitness function, I would like to have the ...
- 41
3
votes
1
answer
48
views
Measuring novel configuration of points
I am trying to implement Novelty search; I understand why it can work better than the standard Genetic Algorithm based solution which just rewards according to the objective.
I am working on a problem ...
