We recognize this expression as just the scalar product.
可以认出，此表达式正好就是标积。
Scalar Product Protocol is the keystone in building privacy-preserving decision tree.
标量积协议是构造隐私保持决策树的关键技术。
The dot product, being the product of three scalars, is a scalar.
点积是三个标量的乘积，所以是个标量。
The dot product, being the product of three scalars, is a scalar.
点积是三个标量的乘积，所以是个标量。
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