Add BigEarthNetv2 dataset

[ando-shah]

Basic BENv2 dataset added. _verify(..) and checksums missing

[nilsleh]

I think between the existing BigEarthNet version and version 2, there is a lot of shared code. The __init__ signature is the same as well, so I would think it's beneficial to inherit from BigEarthNet instead of NonGeoDataset so that a lot of the code does not have to be written twice, and instead only overwrite the relevant parts.

[adamjstewart]

Can someone point me to a summary of the changes between v1 and v2? Basically I'm curious if this is just a newer version of the same dataset (slightly more images or better labels) or a completely new iteration. We could either do:

BigEarthNet(version=1)
BigEarthNet(version=2)

in the case of the former or:

BigEarthNet()
BigEarthNetv2()

in the case of the latter.

[ando-shah]

Yes you're right, I've basically used v1 as the template to write v2.
v2 is the same dataset with the following changes:

• Better labels
• Better spatial splits
• Fewer images - problematic images removed
• pixel-levels labels additionally available ('maps') along with multi-class image-level labels

The reBEN paper details these differences

[adamjstewart]

Gotcha. In that case I'm kind of leaning towards adding a version parameter to the existing dataset. We could default to 2. This would require the fewest code modifications.

[ando-shah]

@microsoft-github-policy-service agree Ando Shah

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[nilsleh]

Just noticed, that this is missing a filter based on the split for the appropriate set.

[nilsleh]

And in v2, the val split is called "validation"