def __init__(self, corpus, id2word=None, num_topics=300):
        self.id2word = id2word
        self.num_topics = num_topics
        if corpus is not None:
            self.initialize(corpus)
`id2word` is a mapping from word ids (integers) to words (strings). It is
dataset/ETHPy150Open largelymfs/topical_word_embeddings/TWE-1/gensim/models/rpmodel.py/RpModel.__init__