Scala Spark中两个数组之间的叉积

Question

考虑scala-spark中的两个数组

val mole_1 = Array(2.0,1.0,0.0,0.0,0.0,0.0)
val mole_2 = Array(2.0,2.0,0.0,0.0,0.0,0.0)

现在，两个数组的按元素相乘的有效方法是

val dot_Mole = (mole_1, mole_2).zipped.map(_ * _).sum

Which yields  >> 6.0

如何使用压缩和映射来实现这些数组之间的交叉乘积，以提供>> 12.0？

仅限USe zipped, map and reduce。