run error on example/ graves_sequence_attention

[cdhx]

i got this error on example/ graves_sequence_attention

ValueError: Layer graves_sequence_attention_6 expects 3 inputs, but it received 2 input tensors. Input received: [<tf.Tensor 'input_11:0' shape=(?, 10, 4) dtype=float32>, <tf.Tensor 'input_12:0' shape=(?, 30, 4) dtype=float32>]

it occur on :lstm_output = attention_rnn([input_labels, attended])