Explain difference between raw/non-raw variants
#3
by
						
albertvillanova
	
							HF Staff
						- opened
							
					
    	
        README.md
    CHANGED
    
    | @@ -135,6 +135,12 @@ Compared to the preprocessed version of Penn Treebank (PTB), WikiText-2 is over | |
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            and numbers - all of which are removed in PTB. As it is composed of full articles, the dataset is well suited for models
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            that can take advantage of long term dependencies.
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            ### Supported Tasks and Leaderboards
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            [More Information Needed](https://github.com/huggingface/datasets/blob/master/CONTRIBUTING.md#how-to-contribute-to-the-dataset-cards)
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            and numbers - all of which are removed in PTB. As it is composed of full articles, the dataset is well suited for models
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            that can take advantage of long term dependencies.
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            +
            Each subset comes in two different variants:
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            - Raw (for character level work) contain the raw tokens, before the addition of the <unk> (unknown) tokens.
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            - Non-raw (for word level work) contain only the tokens in their vocabulary (wiki.train.tokens, wiki.valid.tokens, and wiki.test.tokens).
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              The out-of-vocabulary tokens have been replaced with the the <unk> token.
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            ### Supported Tasks and Leaderboards
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            [More Information Needed](https://github.com/huggingface/datasets/blob/master/CONTRIBUTING.md#how-to-contribute-to-the-dataset-cards)
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