Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/19997#discussion_r157330796
--- Diff: python/pyspark/ml/tests.py ---
@@ -44,6 +44,7 @@
import numpy as np
from numpy import abs, all, arange, array, array_equal, inf, ones, tile,
zeros
import inspect
+import py4j
--- End diff --
Ah, it was my bad. Yup, you are right.
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