# Learning from Examples

To implement even the simplest minimum-distance
classifier, you have to know the mean vectors (templates).
To implement a minimum-Mahalanobis-distance
classifier, you need to know the mean vectors and the covariance
matrix. Usually, this means that you need to estimate these parameters
from examples of the patterns that you want to classify. In this section,
we consider the following topics:
- Learning the mean vector
- Learning the covariance matrix
- Regularization
- Validation

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