By Mitchell Waite, Robert Lafore
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12. 13 provides a schematic representation of the GA mechanism. First, the algorithm instantiates a chromosome population. In order to give birth to the next generation, the reproduction, crossover and mutation operands are applied. For each new chromosome, a value for the fitness function is computed, which shall in turn specify whether the chromosome will be selected for reproduction. This process iterates until an optimal solution is found or until a predefined terminating condition is satisfied.
A density-based cluster is the maximum set of density-connected data points. If a data point is not assigned to any cluster, it is characterized as an outlier. 9 serves as an example of the above definitions. The DBSCAN mechanism can be summarized in the following steps [Han and Kamber, 2001]: 1. Randomly select a data point p 2. Retrieve all the density-reachable points, with respect to Eps and MinPts 3. If p is a core point, a cluster is formed 4. For each core point, find all density-reachable points 5.
Attribute/feature construction, which composes new attributes from the given ones. • Normalization, which scales the data within a small, specified range. The most dominant normalization techniques according to Weiss and Indurkhya are [Weiss and Indurkhya, 1998]: 1) min-max normalization: Linear transformation is applied on the data. Let min^ be the minimum and max^ the maximum values of attribute A. vain — max normalization maps the original attribute A value i / t o a new value v' that lies in the [new-mm A , AGENT INTELLIGENCE THROUGH DATA MINING 20 new „max A], according to Eq.