Pacific Rim Research Program
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The direction of the arrows in the graph encodes the fact that the class depends on these five attributes, and the lack of any arrows between the attributes explicitly encodes the assumption that the attributes are independent (more precisely, the attributes are independent, given we know the class). For example, if A1 is thorax_length and A3 is wingbeat_frequency, this classifier explicitly assumes that these two things are unrelated. This is clearly an unrealistic assumption; larger insects tend to have lower wingbeat frequencies. In spite of these assumptions which are clearly unrealistic for most real world problems, Naïve Bayes has been shown to be competitive with more complex, state-of-the-art classifiers (Dougherty 1995, Kohavi 1994). Nevertheless, if the attributes are known to be related, this can be explicitly encoded by calculating the joint probabilities. For example, before we assumed that attribute 3 (wingbeat_frequency) was independent of the rest of the features and thus could be calculated as
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تاریخ انتشار 2011