Update README.md

README.md

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 SAV = Single Amino Acid Variant
 Task: Variant Effect Prediction
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+Note: DROP any example that has split=nan when training. The reason for leaving them is to keep this dataset identical to the original one.
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 This is a binary classification task predicting whether a single amino acid substitution (mutation) has:
 
 Neutral: No significant effect on protein function/stability (benign/tolerated variant)