self._semlock = _multiprocessing.SemLock._rebuild(*state) FileNotFoundError: [Errno 2] No such file

错误方法：

    for topic in range(15):
        lda_model = gensim.models.LdaMulticore(corpus=corpus, num_topics=topic + 1, id2word=id2word, random_state=100,chunksize=100, passes=10, per_word_topics=True)
        model_list.append(lda_model)
        coherencemodel = CoherenceModel(model=lda_model, texts=train, dictionary=id2word, coherence='c_v')
        coherence_values.append(round(coherencemodel.get_coherence(), 3))

错误提示：

self._semlock = _multiprocessing.SemLock._rebuild(*state)
FileNotFoundError: [Errno 2] No such file or directory

修改方法：
加入

from multiprocessing import Process,Queue,set_start_method,get_context
set_start_method('fork')

正确方法：

from multiprocessing import Process,Queue,set_start_method,get_context
if __name__ == '__main__':
    set_start_method('fork')
    for topic in range(15):
        lda_model = gensim.models.LdaMulticore(corpus=corpus, num_topics=topic + 1, id2word=id2word, random_state=100, chunksize=100, passes=10, per_word_topics=True)
        model_list.append(lda_model)
        coherencemodel = CoherenceModel(model=lda_model, texts=train, dictionary=id2word, coherence='c_v')
        coherence_values.append(round(coherencemodel.get_coherence(), 3))

参考链接：https://www.cnblogs.com/tortoise512/p/14706937.html