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README.md

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-This is a `gpt2-med` model, finetuned on the Wikitext-103 dataset.
+This is a `gpt2-medium` model, finetuned on the Wikitext-103 dataset.
 
 It achieves a perplexity of **11.55** using a "sliding window" context, using the `run_clm.py` script at [https://github.com/neulab/knn-transformers](https://github.com/neulab/knn-transformers).