Fig. 4: Perplexity of different topic numbers obtained by the Sent-LDA and improved Sent-LDA models.
From: What drives reputational risk? Evidence from textual risk disclosures in financial statements
A lower perplexity value corresponds to a better clustering effect of the model. Figure shows that all perplexity values obtained by the improved Sent-LDA model are smaller than those obtained by the original Sent-LDA model, which demonstrates that the improved Sent-LDA model has better clustering results.
