Tensorflow 2.0: resampler not available

[ltrottier]

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System information

• TensorFlow version (you are using): 2.0
• Are you willing to contribute it (Yes/No): No

Describe the feature and the current behavior/state.

I would like tensorflow.contrib.resampler.resampler to be available in TF 2.0. Or, any alternative that allows to interpolate a 2D grid at real coordinates.

Will this change the current api? How?

Yes, it will add a new function.

Who will benefit with this feature?

I was using resampler to optimize ROIAlign (of Mask-RCNN) with rotated bounding boxes (and masks). Instead of doing rotate -> crop -> resize to pool the rotated masks, I directly fetched it with resampler. It was about 2-3x faster.

So anyone who wants to pool random locations in a 2D grid (mostly for instance segmentation I think) could benefit from it.

Any Other info.

[MrSorrow]

So, have you solved this problem?

[sipposip]

I use resampler in an application for a special type of spherical convolution. It would be non-trivial (and potentially slow) to do this with other available ops.

[dynamicwebpaige]

Though this functionality is outside of the scope of TensorFlow Core in the near term, it might be a good fit for TensorFlow Addons. If we see sufficient traction in Addons, then the symbol could be migrated to tensorflow/tensorflow.

Rerouting this feature request to the addons repo; @seanpmorgan for visibility.

[seanpmorgan]

This seems like it would fit within tfa.image. Happy to review a PR for this feature migrated from:
https://github.com/tensorflow/tensorflow/tree/v1.15.0/tensorflow/contrib/resampler

[WindQAQ]

Closes via #662.