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[1] The self-organizing map was introduced by Kohonen in the early 1980s and is an unsupervised learning technique that creates a two-dimensional topological map from n-dimensional input data. A topological map is a mapping that preserves neighbourhood relations. Similar input vectors have close positions on the map.

[2] The permutation problem occurs because two ANNs with different architectures can have the same performance. In other words, even though the two genetic representations of the networks are different, the networks have the same functionality. The permutation problem makes a crossover operator very inefficient and ineffective, since with this operator (permutation of hidden nodes) functionally equivalent networks are obtained (Yao, 1999: 1426).