gensim error: AttributeError: The vocab attribute was removed from KeyedVector in Gensim 4.0.0.
Use KeyedVector’s .key_to_index dict, .index_to_key list, and methods .get_vecattr(key, attr) and .set_vecattr(key, attr, new_val) instead.
Solution:
1. directly modify the code
Find all the modules of vocab.keys() and modify them if they are mods defined by gensim.

Show:

## Wrong
model = KeyedVectors.load_word2vec_format(word2vec_glove_file)
words = np.random.choice(list(model.vocab.keys()), sample)

## Right
model = KeyedVectors.load_word2vec_format(word2vec_glove_file)
words = np.random.choice(list(model.key_to_index.keys()), sample)

Method 2: install the original version

!pip install gensim==3.0