# Codeblock 6a
class LSTMDecoder(nn.Module):
    def __init__(self):
        super().__init__()

        #(1)
        self.embedding = nn.Embedding(num_embeddings=VOCAB_SIZE,
                                      embedding_dim=EMBED_DIM)
        #(2)
        self.lstm = nn.LSTM(input_size=EMBED_DIM, 
                            hidden_size=LSTM_HIDDEN_DIM, 
                            num_layers=NUM_LSTM_LAYERS, 
                            batch_first=True)
        #(3)        
        self.linear = nn.Linear(in_features=LSTM_HIDDEN_DIM, 
                                out_features=VOCAB_SIZE)