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Create README.md

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Add script to create OWT subsamples

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+ These files were created with the following script:
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+
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+ ```python
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+ from datasets import load_dataset
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+ from tqdm import tqdm
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+ import io
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+
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+ dataset = load_dataset("Skylion007/openwebtext")['train']
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+ split_dataset = dataset.train_test_split(train_size=2400000, test_size=60000, seed=0)
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+
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+
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+ with io.open('data/owt_train.txt','w') as fopen:
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+ listout = []
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+ for data in tqdm(split_dataset['train']):
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+ listout.append(data['text']+'<|endoftext|>')
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+ if len(listout) > 1000:
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+ _ = fopen.write(''.join(listout))
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+ listout = []
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+
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+
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+ with io.open('data/owt_valid.txt','w') as fopen:
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+ listout = []
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+ for data in tqdm(split_dataset['test']):
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+ listout.append(data['text']+'<|endoftext|>')
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+ if len(listout) > 1000:
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+ _ = fopen.write(''.join(listout))
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+ listout = []
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+ ```