[PT Model Split] Support 2 operators in PT by C2 conversion (#45231)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/45231
There are two operators:
`PriorCorrectionCalibrationPrediction` and `GatherRangesToDense` is not supported in PT which makes GLOW cannot work.
To unblock, we first try to use C2->PT conversion. In the long-term, we need to implement PT custom ops.
This diff does this conversion to unblock current project.
Test Plan:
Run unit test. the Test input is from current DPER example.
All pass.
```buck test //caffe2/caffe2/python/operator_test:torch_integration_test -- test_prior_correct_calibration_prediction_op --print-passing-details
> c2 reference output
> [0.14285715 0.27272728 0.39130434 0.5 ]
> PT converted output
> tensor([0.1429, 0.2727, 0.3913, 0.5000])
buck test //caffe2/caffe2/python/operator_test:torch_integration_test -- test_gather_ranges_to_dense_op --print-passing-details
c2 reference output
> [array([[6, 5, 4, 3], [0, 0, 0, 0]], dtype=int64)]
> PT converted output
> [tensor([[6, 5, 4, 3], [0, 0, 0, 0]])]
```
Reviewed By: allwu, qizzzh
Differential Revision: D23858329
fbshipit-source-id: ed37118ca7f09e1cd0ad1fdec3d37f66dce60dd9
