Clean/remove duplicate images with fastdup

[mrdbourke]

Make a script to clean and remove duplicate images with fastdup - https://github.com/visual-layer/fastdup

• This works well since they did a test across ImageNet21k (millions of images) and it worked in ~3 hours
• Could run this script periodically to clean images whenever new images are downloaded

[mrdbourke]

Did this with a notebook and removed 695/25000 (or there abouts) images, saw a slight reduction in performance but this was expected due to less data leakage between train & test sets, see the evaluation run: https://wandb.ai/mrdbourke/test_wandb_artifacts_by_reference/runs/714m0crl

[mrdbourke]

Original notes (from #50) -

• Found a library to help with image duplication thanks to hashing — https://github.com/idealo/imagededup
  Removing duplicates will help make the model more robust and prevent data from leaking from train → test set (and then giving false metrics)
• Created a small notebook for this (07_remove_duplicates.ipynb) and it seems to work very well, found ~500/24500 images were duplicates in a few minutes and there were little samples that weren’t (after a series of quick random plots)
• Could integrate this workflow to run over all the images every so often (or whenever new data is added to the dataset).

[mrdbourke]

Next will be to turn the notebook version of this into a script