LDAWordCloud(self, lda_model, id2word, top_n, **kwargs)
LDAWordCloud.plot_topic(self, n)
lda_model: object LDA model by gensim
id2word: dict(int -> str) dictionary of id to word mapping
top_n: int number of top words to be shown in a topic
import math
from wordcloud import WordCloud, STOPWORDS
from wordcloud import (WordCloud, get_single_color_func)
import matplotlib.pyplot as plt