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The perplexity of different topic numbers
| Number of topics | Paris | Amsterdam | Lisbon |
|---|---|---|---|
| 3 | 856.12 | 743.62 | 589.53 |
| 4 | 855.84 | 740.69 | 585.98 |
| 5 | 850.39 | 743.93 | 589.90 |
| 6 | 856.33 | 746.75 | 586.72 |
| 7 | 860.11 | 749.42 | 588.85 |
| 8 | 858.67 | 751.77 | 595.80 |
The lower the perplexity, the higher the LDA model prediction accuracy
