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Imagenet.int8: Entire Imagenet dataset in 5GB

small

original, reconstructed from float16, reconstructed from uint8

Find 138 GB of imagenet dataset too bulky? Did you know entire imagenet actually just fits inside the ram of apple watch?

Resized, Center-croped to 256x256
VAE compressed with SDXL's VAE
Further quantized to int8 near-lossless manner, compressing the entire training dataset of 1,281,167 images down to just 5GB!

Introducing Imagenet.int8, the new MNIST of 2024. After the great popularity of the Latent Diffusion (Thank you stable diffusion!), its almost the standard to use VAE version of the imagenet for diffusion-model training. As you might know, lot of great diffusion research is based on latent variation of the imagenet.

These include:

... but so little material online on the actual preprocessed dataset. I'm here to fix that. One thing I noticed was that latent doesn't have to be full precision! Indeed, they can be as small as int-8, and it doesn't hurt!

So clearly, it doesn't make sense to download entire Imagenet and process with VAE everytime. Just download this, to('cuda') the entire dataset just to flex, and call it a day.😌

(BTW If you think you'll need higher precision, you can always further fine-tune your model on higher precision. But I doubt that.)

How do I use this?

First download this. You can use huggingface-cli for that.

# Pro tip : use `hf_transfer` to get faster download speed.
pip install hf_transfer
export HF_HUB_ENABLE_HF_TRANSFER=True
# actual download script. 
huggingface-cli download --repo-type dataset cloneofsimo/imagenet.int8 --local-dir ./vae_mds

Then, you need to install streaming dataset to use this. The dataset is MDS format.

pip install mosaicml-streaming

Then, you can very simply use the dataset like this:

(for more info on using Mosaic's StreamingDataset and MDS format, reference here)

from streaming.base.format.mds.encodings import Encoding, _encodings
import numpy as np
from typing import Any
import torch
from streaming import StreamingDataset

class uint8(Encoding):
    def encode(self, obj: Any) -> bytes:
        return obj.tobytes()

    def decode(self, data: bytes) -> Any:
        x=  np.frombuffer(data, np.uint8).astype(np.float32)
        return (x / 255.0 - 0.5) * 24.0

_encodings["uint8"] = uint8

remote_train_dir = "./vae_mds" # this is the path you installed this dataset.
local_train_dir = "./local_train_dir"

train_dataset = StreamingDataset(
    local=local_train_dir,
    remote=remote_train_dir,
    split=None,
    shuffle=True,
    shuffle_algo="naive",
    num_canonical_nodes=1,
    batch_size = 32
)

train_dataloader = torch.utils.data.DataLoader(
    train_dataset,
    batch_size=32,
    num_workers=3,
)

By default, batch will have three attributes: vae_output, label, label_as_text.

Thats the dataloader! Now, below is the example usage. Notice how you have to reshape the data back to (B, 4, 32, 32) as they are decoded flattened.

###### Example Usage. Decode back the 5th image. BTW shuffle plz
from diffusers.models import AutoencoderKL
from diffusers.image_processor import VaeImageProcessor

model = "stabilityai/your-stable-diffusion-model"
vae = AutoencoderKL.from_pretrained("stabilityai/sdxl-vae").to("cuda:0")

batch = next(iter(train_dataloader))

i = 5
vae_latent = batch["vae_output"].reshape(-1, 4, 32, 32)[i:i+1].cuda().float()
idx = batch["label"][i]
text_label = batch['label_as_text'][i]

print(f"idx: {idx}, text_label: {text_label}, latent: {vae_latent.shape}")
# idx: 402, text_label: acoustic guitar, latent: torch.Size([1, 4, 32, 32])

# example decoding
x = vae.decode(vae_latent.cuda()).sample
img = VaeImageProcessor().postprocess(image = x.detach(), do_denormalize = [True, True])[0]
img.save("5th_image.png")

Enjoy!

Citations

If you find this material helpful, consider citation!

@misc{imagenet_int8,
  author       = {Simo Ryu},
  title        = {Imagenet.int8: Entire Imagenet dataset in 5GB},
  year         = 2024,
  publisher    = {Hugging Face Datasets},
  url          = {https://huggingface.co/datasets/cloneofsimo/imagenet.int8},
  note         = {Entire Imagenet dataset compressed to 5GB using VAE and quantized with int8}
}