Move code that converts ddf tensor to itk VectorImage into library?

[wyli]

Discussed in #4104

^{Originally posted by HastingsGreer April 11, 2022}
There is a correct way to convert a ddf tensor accepted by Monai's warp block into an itk VectorImage accepted by itk's WarpImageFilter.

This conversion is defined and tested here:

MONAI/tests/test_warp.py

Line 178 in af6560a

import itk

I would like to use this conversion code, and I think it is generally useful since it correctly handles fiddly details like transposing the tensor and reversing the order of elements in each vector. Would a pull request moving it from the test code into the MONAI library be welcome?

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see also https://github.com/Project-MONAI/tutorials/blob/master/modules/resample_benchmark.ipynb