keras.layers.Dense是否创建权重矩阵

Question

在此代码中，wq是随机创建的大小为d_model的权重矩阵

class MultiHeadAttention(tf.keras.layers.Layer):
  def __init__(self, d_model, num_head):

    self.wq = tf.keras.layers.Dense(d_model)
    self.wk = tf.keras.layers.Dense(d_model)
    self.wv = tf.keras.layers.Dense(d_model)

    self.dense = tf.keras.layers.Dense(d_model)
 def call(self, v, k, q, mask):
     batch_size = tf.shape(q)[0]
     q = self.wq(q)

最后一行发生了什么