before_sent: In sequence-to-sequence learning,  the decoder relies on the attention mechanism to efficiently extract information from the encoder.
before_sent_with_intent: <meaning-changed> In sequence-to-sequence learning,  the decoder relies on the attention mechanism to efficiently extract information from the encoder.
after_sent: In sequence-to-sequence learning, e.g., natural language generation, the decoder relies on the attention mechanism to efficiently extract information from the encoder.