我按照以下教程创建了一个Gensim LDA模型:https://www.machinelearningplus.com/nlp/topic-modeling-gensim-python/
lda_model = gensim.models.LdaMulticore(data_df['bow_corpus'], num_topics=10, id2word=dictionary, random_state=100, chunksize=100, passes=10, per_word_topics=True)
它生成了10个主题,log_perplexity为:
lda_model.log_perplexity(data_df['bow_corpus']) = -5.325966117835991
但是当我运行一致性模型来计算相干性得分时:
coherence_model_lda = CoherenceModel(model=lda_model, texts=data_df['bow_corpus'].tolist(), dictionary=dictionary, coherence='c_v')
with np.errstate(invalid='ignore'):
lda_score = coherence_model_lda.get_coherence()
我的LDA分数为nan。这是什么问题?