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Table 2 Perplexities, number of parameters, and the computation cost of the bigram-PLSA model and other language models.

From: A New Bigram-PLSA Language Model for Speech Recognition

Model

Calculated parameter

Number of model parameters

Time of each EM iteration

Perplexity

bigram

Maximum 38002

—

198

trigram

Maximum 38003

—

134

PLSA

215000

0.6 second

Bigram & PLSA (linear interpolation)

14655000

0.6 second

Bigram-PLSA (Nie et al.'s)

577620000

19 minutes

Bigram-PLSA (proposed)

653600000

24 minutes