我有一个 user's “味觉”向量：

+------+--------------------+
|userId|      scaledFeatures|
+------+--------------------+
|    18|[0.0,0.0,0.0,0.0,...|
|    65|[0.0,0.0023910733...|
|    96|[0.0,0.0,0.005268...|
|   121|[0.0,0.0021253985...|
|   129|[0.0,0.0029224229...|
+------+--------------------+

以及 movie's 内容向量：

+-------+--------------------+
|movieId|      scaledFeatures|
+-------+--------------------+
|      1|[1.0,0.0,0.0,0.0,...|
|      2|[1.0,0.0,0.0,0.0,...|
|      3|[0.0,0.0,0.0,0.0,...|
|      4|[0.0,0.0,0.0,0.0,...|
|      5|[0.0,0.0,0.0,0.0,...|
+-------+--------------------+

如何服用 user's 味觉矢量 userId 与…相乘 movie's pyspark中的内容表？所以我可以通过 movieId ?