Figure 2.
Two line graphs showing perplexity curves for paper topics (left) and patent topics (right). In both plots, perplexity decreases rapidly as the number of topics (K) increases from 2 to 5, then levels off or increases slightly. The inflection point at K=5 indicates the optimal number of topics for both datasets.The two scatter plots are labelled a and b. The horizontal axis in both plots is the number of topics from 2 to 14. The vertical axis is the perplexity score. In plot a for paper topics, the points decrease steadily as the number of topics increases. In plot b for patent topics, the points also decrease as the number of topics increases. Both plots show a downward trend with no reversals.

The calculation results of data sets topic perplexity

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