Questions tagged [local-search]
The local-search tag has no usage guidance.
19
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Node swap and edge swap for TSP
When devising heuristics for the TSP I often see edge exchange algorithms suggested. But I also find them a bit hard to understand and somewhat cumbersome to implement.
When I think about a TSP, I ...
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What methods exist for tree search over a large complex state representation?
Tree search over a state space often assumes that the state can be represented compactly and repeated in each node of the search tree.
Suppose I have a large simulation with 100000's of entities each ...
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Is there an open-source equivalent to LocalSolver?
I have a constraint programming problem that is easy to formulate and solve (with high solution quality) in LocalSolver. However, I would really prefer to use something open source for ...
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How can I use a local search meta heuristic after completing construction heuristic?
I'm investigating how I can combine a construction heuristic and a local search metaheuristic to quickly solve Capacitated Split Delivery Veichle Routing Problem (CSDVRP). The construction heuristic ...
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Can Local Search Operators be formulated as a Mixed Integer Program?
Consider the situation of Vehicle Routing. Once we have an initial solution, one can apply various local search moves to improve it.
For example:
Removing a single customer from a route and inserting ...
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How to do Local search when using Greedy random heuristics for GAP
If I want to try a greedy randomized adaptive search procedure for the generalized assignment problem (assign N tasks to N workers to minimize the total costs), the GRASP method requires 2 parts
...
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683
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Book to learn metaheuristics
I want to learn about metaheuristics and start building one to solve combinatorial optimization which is pretty hard to solve. I am looking for book recommendation or any learning experience to learn ...
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When to use Tabu Search or Genetic Algorithms and when not?
Are there any rules of thumb about when to implement which? For example, I am trying to solve OR scheduling problems. I see that majority of people have implemented Genetic Algorithms. However, more ...
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Question re Tabu Search
I am working through the Udemy course "Optimizing Travelling Salesman and Vehicle Routing Problems".
A part of the course is looking at Tabu search as a solution to the vehicle routing ...
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Traveling Salesman Problem: determine k-exchange feasibility
Given a current solution $S$ and a $k$-exchange move $(v_1, .., v_{2k+1})$ with $v_1 = v_{2k+1}$, $v_i \neq v_j$, $(v_i, v_{i+1}) \in E(S)$ iff $i$ odd, i.e. we remove all edges $(v_i, v_{i+1})$ for $...
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When solving many MILPs how to assign CPU cores to solver instances?
Let's say I have an 16 core machine and many roughly equally hard MILP problems and enough RAM. The latency of solving doesn't matter. With how many cores should I start solvers on to maximize ...
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Increase the dimension to ease the local search?
Local search, as the name suggests, takes a local angle to the optimization problem. In deep learning, an adjacent field, the "local minima" problem is frequently mitigated by increasing the ...
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Paper suggestions on local search algorithms
I am looking for papers (or any resources) that go deep into the details of implementing local search algorithms.
I don't want an introductory paper on the subject. Rather, I would prefer a survey ...
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616
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Learning local search operator selection
I'm just reading [1]. The authors use a neural network to solve capacitated vehicle routing problems through iterative generation of tours by solving a price-collecting traveling salesman problem in ...
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PSO. Hyperparameter Optimization for Similar Problems
I am doing a project where I am using Particle Swarm Optimization (PSO) for a design optimization problem. Naturally, in there I had to conduct hyperparameter optimization to find the most optimal ...
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How to implement a local search with different operators?
I read some papers on local search. I remark that several authors use different move operators. However, the pseudo-code I found on google only uses one operator.
I am wondering how to implement the ...
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How to correct this scheduling algorithm?
I have a scheduling problem to solve. It's a resource-constrained project scheduling problem with time-varying resource availabilities. The objective is minimizing tardiness. The full detailed model ...
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In Local Search, which reheating techniques have a good track record?
Given a fast-stepping Local Search (such as Simulated Annealing or Late Acceptance), which reheating approach is proven to work well?
Generally speaking, reheating works like this: if [a condition is ...
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On what kind of problems a local search may perform better than MIP / CP techniques? [closed]
In combinatorial optimization, on what type of problem a local search may lead to better & quicker solutions than usual mixed-integer programming and constraint programming techniques ?
By type ...
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