Sequence Packing with ChatDataModule

[simoneangarano]

Is your feature request related to a problem? Please describe.

NeMo/nemo/collections/llm/gpt/data/chat.py

Line 88 in 8201231

pack_metadata_file_path=None, # packing is not supported

pack_metadata_file_path=None, # packing is not supported

Describe the solution you'd like

I'd like to use sequence packing in SFT with chat-like data.