checkpointing errors fix #256
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Problem: Error in saving checkpoint of model as an inner function is used in creating block mask.
While executing the code with checkpoint saving turned on, the dataloader state can't be saved as the llama function create_block_mask_from_seqlens contains a local function which python cannot pickle.
AttributeError: Can't get local object 'create_block_mask_from_seqlens..document_causal_mask'
Solution: Simulate the document_causal_mask functionality using a partial function so that it is not treated as a local function anymore.