rmse was wrongly calculated

It was multiplying with U instaed of dividing by U

Author: Viveka Kulharia <vivkul@iitk.ac.in>

Closes #9771 from vivkul/patch-1.

(cherry picked from commit 1429e0a)
Signed-off-by: Sean Owen <sowen@cloudera.com>

Author: Viveka Kulharia

examples/src/main/python/als.py

@@ -36,7 +36,7 @@
 
 def rmse(R, ms, us):
     diff = R - ms * us.T
-    return np.sqrt(np.sum(np.power(diff, 2)) / M * U)
+    return np.sqrt(np.sum(np.power(diff, 2)) / (M * U))
 
 
 def update(i, vec, mat, ratings):