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How many hidden layers and nodes?

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The question of how many hidden layers and how many hidden nodes should there be always comes up in any classification task of remotely sensed data using neural networks. Until today there has been no exact solution. A method of shedding some light to this question is presented in this paper. A near-optimal solution is discovered after searching with a genetic algorithm. A novel fitness function is introduced that concurrently seeks for the most accurate and compact solution. The proposed method is thoroughly compared to many other methods currently in use, including several heuristics and pruning algorithms. The results are encouraging, indicating that it is time to shift our focus from suboptimal practices to efficient search methods, to tune the parameters of neural networks.
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Document Type: Research Article

Affiliations: Joint Research Centre (JRC) of the European Commission, Institute for the Protection and Security of the Citizen (IPSC), Monitoring Agriculture with Remote Sensing (MARS) Unit, Food Security Action, 21020 (VA), Ispra, Italy

Publication date: 01 April 2009

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