Update README.md

README.md

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 # D_ASAP2
 
-This is the **test split** of the ASAP 2.0 dataset, prepared for use with the 
+This is the **train, test, and validation split** of the ASAP 2.0 dataset, prepared for use with the 
 [S-GRADES benchmark](https://sgrades.eng.unt.edu). Ground truth labels have 
 been removed to prevent leakage during evaluation.