litdata with huggingface instead of S3

[ehartford]

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🚀 Feature

I wanna use litdata to stream huggingface dataset cerebras/SlimPajama-627B. (not S3)

Motivation

How can I stream huggingface dataset instead of S3

Pitch

I wanna stream huggingface dataset not S3

Alternatives

just to stream huggingface dataset instead of S3

Additional context

I wanna use huggingface dataset, not S3

[github-actions[bot]]

Hi! thanks for your contribution!, great first issue!

[tchaton]

Hey @ehartford. I have already prepared a version of SlimPajama. It is ready to use on the platform.

[tchaton]

Here is the code:

from litdata import StreamingDataset, CombinedStreamingDataset
from litdata.streaming.item_loader import TokensLoader
from tqdm import tqdm
import os
from torch.utils.data import DataLoader

train_datasets = [
    StreamingDataset(
        input_dir="s3://tinyllama-template/slimpajama/train/",
        item_loader=TokensLoader(block_size=2048 + 1), # Optimized loader for tokens used by LLMs 
        shuffle=True,
        drop_last=True,
    ),
    StreamingDataset(
        input_dir="s3://tinyllama-template/starcoder/",
        item_loader=TokensLoader(block_size=2048 + 1), # Optimized loader for tokens used by LLMs 
        shuffle=True,
        drop_last=True,
    ),
]

# Mix SlimPajama data and Starcoder data with these proportions:
weights = (0.693584, 0.306416)
combined_dataset = CombinedStreamingDataset(datasets=train_datasets, seed=42, weights=weights)

train_dataloader = DataLoader(combined_dataset, batch_size=8, pin_memory=True, num_workers=os.cpu_count())

# Iterate over the combined datasets
for batch in tqdm(train_dataloader):
    pass

[ehartford]

Ok but, is it better to support hugging face instead of having to copy the dataset to s3? Aws charges for ingress and egress

[Borda]

Ok but, is it better to support hugging face instead of having to copy the dataset to s3?

we used to have some issues with the stability and reachability of HF models and datasets in the past so I may say that S3 is a more reliable alternative...

[tchaton]

Hey @ehartford. In order to stream datasets, we need to optimize the dataset first. We could have an auto-optimize version for the HF datasets, but it would still require to download the dataset and convert it.

HF supports some streaming with webdataset backend but I gave up on it as it was too un-reliable for anything serious. The pipe breaks, it doesn't support multi node, etc...

If you are interested in using any particular dataset, I recommend trying out the Lightning AI platform.

Here is an example where I prepare Wikipedia Swedish: https://lightning.ai/lightning-ai/studios/tokenize-2m-swedish-wikipedia-articles

And another one were I prepared SlimPajama & StarCoder: https://lightning.ai/lightning-ai/studios/prepare-the-tinyllama-1t-token-dataset.

Don't hesitate to ask any other questions :)