出现在一行代码中间位置的@这个@是矩阵相乘的意思，
就是比如
A的shape是[batch_size, sequence_length2, sequence_length1]
B的shape是[batch_size, sequence_length1, hidden_dim]
C = A @ B
则C的shape是[batch_size, sequence_length2, hidden_dim]
python 变量@变量
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转载自blog.csdn.net/guotong1988/article/details/103557218
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