Update README.md

README.md

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 The proposed Humback is a novel framework that can augment the instruction data for supervised fine-tuning with high quality.
 
-This is a backward model $M_{0}$ for [Humback](https://arxiv.org/pdf/2308.06259.pdf) reproduction.
+This is a SFT (supervised fine-tuning) model $M_{0}$ for [Humback](https://arxiv.org/pdf/2308.06259.pdf) reproduction.
 
 This model is trained on the seed data.