基于这段代码，将代码中的gru换成bigru,并在bigru后面加入多头注意力机制:SeqSelfAttention(attention_activation='sigmoid')

好的，以下是修改后的代码： ```python from keras.layers import Input, Dense, Bidirectional, CuDNNLSTM, SeqSelfAttention, MultiHeadAttention from keras.models import Model def create_model(input_shape, num_heads=8): input_layer = Input(shape=input_shape) x = Bidirectional(CuDNNLSTM(64, return_sequences=True))(input_layer) x = SeqSelfAttention(attention_activation='sigmoid')(x) x, attn_weights = MultiHeadAttention(num_heads=num_heads)(x, x, x) output_layer = Dense(1, activation='sigmoid')(