[Feature] Add BaseVFIDataset

[Yshuo-Li]

No description provided.

[codecov]

Codecov Report

Merging #695 (ab882da) into master (61dfdd6) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #695      +/-   ##
==========================================
+ Coverage   81.35%   81.39%   +0.04%     
==========================================
  Files         202      203       +1     
  Lines       11625    11655      +30     
  Branches     1868     1875       +7     
==========================================
+ Hits         9457     9487      +30     
  Misses       1873     1873              
  Partials      295      295              

Flag	Coverage Δ
unittests	81.38% <100.00%> (+0.04%)	⬆️

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Impacted Files	Coverage Δ
mmedit/datasets/__init__.py	100.00% <100.00%> (ø)
mmedit/datasets/base_vfi_dataset.py	100.00% <100.00%> (ø)

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[ckkelvinchan]

Some lines are not covered by unittests.

Moreover, please check if a dataset contains multiple videos with different number of frames, how the PSNR is calculated. In video SR, we usually compute the average PSNR of each video, and then take the average of all videos, as shown here.

[Yshuo-Li]

Some lines are not covered by unittests.

Moreover, please check if a dataset contains multiple videos with different number of frames, how the PSNR is calculated. In video SR, we usually compute the average PSNR of each video, and then take the average of all videos, as shown here.

If a dataset contains multiple videos with different numbers of frames, it should inherit the basic class and modify this function.

[ckkelvinchan]

Some lines are not covered by unittests.
Moreover, please check if a dataset contains multiple videos with different number of frames, how the PSNR is calculated. In video SR, we usually compute the average PSNR of each video, and then take the average of all videos, as shown here.

If a dataset contains multiple videos with different numbers of frames, it should inherit the basic class and modify this function.

So this dataset is for N frames -> 1 frame case?

[Yshuo-Li]

Some lines are not covered by unittests.
Moreover, please check if a dataset contains multiple videos with different number of frames, how the PSNR is calculated. In video SR, we usually compute the average PSNR of each video, and then take the average of all videos, as shown here.

If a dataset contains multiple videos with different numbers of frames, it should inherit the basic class and modify this function.

So this dataset is for N frames -> 1 frame case?

Yes, 2 frames -> 1 frame