Update readme.md

README.md

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 The dataset contains 5462 training samples, 711 validation samples and 725 test samples. 
-Each sample represents a sentence and includes the following features: sentence ID ('sent\\\\_id'), 
-list of tokens ('tokens'), list of lemmas ('lemmas'), list of UPOS tags ('upos\\\\_tags'), 
-list of Multext-East tags ('xpos\\\\_tags), list of morphological features ('feats'), 
-and list of IOB tags ('iob\\\\_tags'), which are encoded as class labels.
+Each sample represents a sentence and includes the following features: sentence ID ('sent\_id'), 
+list of tokens ('tokens'), list of normalised tokens ('norms'), list of lemmas ('lemmas'), list of UPOS tags ('upos\_tags'), 
+list of Multext-East tags ('xpos\_tags), list of morphological features ('feats'), 
+and list of IOB tags ('iob\_tags'), which are encoded as class labels.