To test these new techniques, experiments on stochastic network grammar acquisition were performed. For training data, the ATR Dialog Database was used. The learning conditions of these experiments are shown in Table 1 .
type of Hidden Markov model | Mealy type |
number of training sentences | 8,475 |
total number of words | 57,354 |
vocabulary | 6,418 words |
end of HMM learning | 40th iteration |