向gensim word2vec模型添加单词，但在model.wv中不显示

import gensim

model = gensim.models.Word2Vec.load('your_model_path')

new_word = 'your_word'
vector = model.wv.vectors.mean(axis=0)  # 随机分配向量表示

model.wv.vocab[new_word] = gensim.models.word2vec.Vocab(index=len(model.wv.vocab),
                                                       count=1)
model.wv.vectors = np.vstack([model.wv.vectors, vector])
model.trainables.syn1neg = np.vstack([model.trainables.syn1neg, vector])

model.build_vocab([list(model.wv.vocab.keys())], update=True)
model.train([], total_examples=model.corpus_count, epochs=model.epochs)

if new_word in model.wv.vocab:
    print("New word is added to the model.")
else:
    print("Failed to add the new word to the model.")