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This model is responsible to train a brightness curve.

Bug: 881215
Change-Id: Ic0c474a0c1f8db6e5f14ae6b738f4d4a1086bf4b
Reviewed-on: https://chromium-review.googlesource.com/c/1300353
Commit-Queue: Jia Meng <jiameng@chromium.org>
Reviewed-by: Andrew Moylan <amoylan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603417}