GitLab

preprocess_data:
- Adds ability to not split sentences. This is used for gpt2 datasets.

- Adds ability to create multiple datasets from different json keys,
this is current untested.

indexed_dataset:
- Add new "get" function to get a portion of an entry.

Co-authored-by: shoeybi <shoeybim@gmail.com>
Co-authored-by: raulpuric <raulpuric@berkeley.edu>
Co-authored-by: jaredcasper <jaredcasper@gmail.com>
Co-authored-by: mpatwary <mostofa.patwary@gmail.com>
Co-authored-by: plegresl <plegresl@gmail.com>