Keras, TensorFlow.
vocabulary index based on word frequency. `vocab_size = 10000 # Assigning a value for the vocabulary size oov_tok = '<OOV>' # Assigning a value for the out-of-vocabulary token tokenizer = Tokenizer(num_words = vocab_size, oov_token=oov_tok) tokenizer.fit_on_texts(train_text) word_index =