LSTM based Conversation Models
Table 2: The best perplexity numbers of the three models on the development set.
['Model', '[ITALIC] K', '[ITALIC] H', '[ITALIC] M', 'Perplexity']
4.3.1 Perplexity R-LDA-Conv gives the lowest perplexity among the four models, nearly 8 points improvement over the baseline model. Comparing role vs. global topic, role has a bigger improvement on perplexity of 11% reduction for role vs. 7% for LDA topic. Combining both leads to a 15% reduction in perplexity. To simplify the comparison, in the following experiments, we only use the best configuration for each model.