Make interpolate bicubic match opencv result (#19703)
Summary:
Fixes #19650
When driazati started bicubic implementation we used TF result as ground truth. It turns out opencv version bicubic resize is used more commonly.
This PR does two things:
- Fix a bug where we didn't use area mode to compute source index
- Follow the Opencv logic to handle computed negative source indices(we used to bound them by 0).
Pull Request resolved: https://github.com/pytorch/pytorch/pull/19703
Differential Revision: D15078159
Pulled By: ailzhang
fbshipit-source-id: 06a32baf2fbc93b90a156b863b4f9fab326d3242
