About parameter n_topics

Thank you for your great codebase for t-SNE! I believe it helped a significant amount of people and of no doubt I am one of them :) I actually would like to ask about the parameter n_topics. It seems it is determined in a specific application scenario. Then, for general usage of t-SNE, how should I decide this parameter? Or should it be fixed to 2 as it is now?

Appreciate it and happy new year!