Merge pull request tensorflow#41498 from tensorflow-jenkins/version-n…

…umbers-2.3.0rc2-11909

Update version numbers for TensorFlow 2.3.0-rc2

Merge pull request tensorflow#41140 from srjoglekar246/cherrypicks_5EM5L

r2.3 cherry-pick request: Shift padded NMS compat window forward to fix TFLite conversion

Merge pull request tensorflow#40813 from geetachavan1/cherrypicks_6WCZX

[CherryPick:r2.3] Fix docker for numpy

Merge pull request tensorflow#39525 from tensorflow/mm-fix-major-api-…

…version

Fix tests when `tf._major_api_version` does not exist

Merge pull request tensorflow#39441 from terryheo/r1.15-fix-rpi-build

Switch Raspberry Pi building to unofficial GCC 6.5 toolchain

Merge pull request tensorflow#39355 from tensorflow-jenkins/relnotes-…

…2.0.2-25649

Update release notes for TensorFlow 2.0.2

Update version numbers to 2.2.0

Merge pull request tensorflow#39032 from tensorflow/mm-update-estimat…

…or-hash

Use Estimator 2.2.0

Merge pull request tensorflow#37312 from tensorflow-jenkins/relnotes-…

…2.2.0rc0-16655

Update release notes for TensorFlow 2.2.0

Merge pull request tensorflow#37919 from reedwm/none_grad_fix

2.2-rc2 cherry-pick request: Fix crash in Model.fit() if a gradient is None