怎么使用keras实现多头注意力

要使用Keras实现多头注意力，首先需要导入所需的模块和库：

from tensorflow.keras.layers import Dense, Dropout, Activation, Input, Embedding, Concatenate
from tensorflow.keras.models import Model
from tensorflow.keras.optimizers import Adam
from tensorflow.keras.initializers import glorot_uniform
from tensorflow.keras import backend as K

接下来，定义一个自定义的多头注意力层：

class MultiHeadAttention():
    def __init__(self, d_model, num_heads):
        self.d_model = d_model
        self.num_heads = num_heads
        assert d_model % num_heads ==