It is recommended to use alpha=1 when using Laplace smoothing in the Naïve Bayes algorithm. Alpha represents the smoothing parameter and a higher value will push the likelihood probability towards a uniform distribution of 0.5, which does not provide much information. Therefore, it is preferable to use alpha=1 to remove the problem of zero probability. Laplace smoothing is used to smooth categorical data and can be applied to all features or just one feature. It is also used for regularization purposes and the degree of regularization depends on the value of alpha, which can be chosen by validation.
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