Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/20682#discussion_r171738603
--- Diff: python/pyspark/ml/tuning.py ---
@@ -15,6 +15,7 @@
# limitations under the License.
#
import itertools
+import sys
--- End diff --
Could we
```
import itertools
import sys
from multiprocessing.pool import ThreadPool
import numpy as np
...
```
?
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