why does 'Doc2Vec' object has no attribute 'n_similarity' ,most_similar, relative cosine_similarity from?? this is while calculating the scores

Question

#training a gensim model & finding the cosine similarity

model = Doc2Vec(dm = 1, min_count=1, window=10, sample=1e-4, negative=10,epochs=20)
model.build_vocab(questions_labeled)
model.train(questions_labeled, total_examples=model.corpus_count, epochs=model.epochs)

model.most_similar('good')

doc2vec_scores = []
for i in range(len(questions1_split)):
    score = model.n_similarity(questions1_split[i],questions2_split[i])
    doc2vec_scores.append(score)