Add a note about padded vocab size during training

#43
by mathemakitten - opened

Per our Slack convo β€” for newcomers to BLOOM it's unclear why the vocab_size in the config.json is 250880 while the model card says 250680. This helps clarify that the effective vocab size is 250680 but the instantiated matrix will be of shape 250880.

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This branch has merge conflicts in the following files:
  • README.md

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