Add IRFFT2 transform

[guarin]

See #1646 for information

Please use https://pytorch.org/docs/stable/generated/torch.fft.irfft2.html to implement the transform.

[snehilchatterjee]

Hi, I’d like to work on this and RFFT2 as my first issues! Can you assign them to me?

[guarin]

Hi, yes of course, I'll assign the issue to you.

[snehilchatterjee]

Hi, I’ve added the RFFT2D and IRFFT2D transforms to lightly/transforms. As mentioned in the original issue, I ensured that the input and output formats for both transforms are C, H, W.

Additionally, I used an image from the BSD100 dataset to verify that the transforms are working as expected. I obtained the frequency image using RFFT2D and passed it through IRFFT2D to confirm that the original image is restored correctly.

Is there anything else I might have missed in addressing the issue? If everything is in order, would it be alright to open a PR for these two transforms?

[guarin]

This sounds great! Feel free to open a PR

[snehilchatterjee]

Hi have opened a PR but it seems that it failed on format check because of init.py because I didn't want to change the format of the file from the master branch. Please let me know if you want me to change the format for init.py so that it passes the format check.

[guarin]

I answered directly in the PR :)