Introduction to Information Retrieval by Christopher D. Manning & Prabhakar Raghavan & Hinrich Schütze

Author:Christopher D. Manning & Prabhakar Raghavan & Hinrich Schütze [Manning, Christopher D.]
Language: eng
Format: azw3
ISBN: 9780521865715
Publisher: Cambridge University Press
Published: 2008-07-06T16:00:00+00:00

Figure 13.3 NB algorithm (Bernoulli model): Training and testing. The add-one smoothing in Line 8 (top) is in analogy to Equation (13.7) with B = 2.

The models also differ in how nonoccurring terms are used in classification. They do not affect the classification decision in the multinomial model; but in the Bernoulli model the probability of nonoccurrence is factored in when computing P(c|d) (Figure 13.3., APPLYBERNOULLINB, Line 7). This is because only the Bernoulli NB models absence of terms explicitly.

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