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We will need the same bucketization during inference. Hence move common code to
the helper file to avoid code duplication and also to ensure consistency.

Bug: 862461
Change-Id: I75e53c6a409ce7f61383637b783158abd7f59e32
Reviewed-on: https://chromium-review.googlesource.com/1154607
Commit-Queue: Jia Meng <jiameng@chromium.org>
Reviewed-by: Michael Martis <martis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580798}