Better release notes

Currently, datasets updates are poorly documented. The API isn’t great, and it requires versions to still be supported.

class MyDataset(tfds.core.GeneratorBasedBuilder):
  VERSION = tfds.core.Version('2.0.1', release_note='Fix typo')
  SUPPORTED_VERSIONS = [
      tfds.core.Version('2.0.0', release_note='Add new field'),
      tfds.core.Version('1.0.0', release_note='First release'),
  ]

Instead, it improve usability and discoverability to have an entirely separate field, independent of the supported version, like:

class MyDataset(tfds.core.GeneratorBasedBuilder):
  VERSION = tfds.core.Version('2.0.1')
  RELEASE_NOTES = {
      '2.0.1': 'Fix typo',
      '2.0.0': 'Add new field',
      '1.0.0': 'First release',
  }

Notes:

• This field should be added to BuilderConfig too.
• tfds new <> template should be updated to have RELEASE_NOTES = {...} (to help discoverability)
• Documentation should be updated in future PR to use this new field

[vijayphoenix]

By looking at the logs like

path = ‘gs://tfds-data/datasets\mnist’

@NikhilBartwal I guess some of those errors are because of Windows OS. So, it not related to RELEASE NOTES.

Related issue https://github.com/tensorflow/datasets/issues/1911#issuecomment-616224484 and pending part of PR https://github.com/tensorflow/datasets/pull/1916

[Keshav15]

ohh I havent seen that You already created it.