Update README.md

README.md

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 ## 🐋 Humpback-reproduce
 
-This is a backward model $M_{yx}$ for [Humback](https://arxiv.org/pdf/2308.06259.pdf) reproduction.
+This is a backward model _Myx_ for [Humback](https://arxiv.org/pdf/2308.06259.pdf) reproduction.
 
 This model (llama2 7B) is trained on the seed data ([openassistant-guanaco](https://huggingface.co/datasets/timdettmers/openassistant-guanaco) __ENGLISH DATA ONLY__) in a reversed order ((output, instruction) pairs {(yi, xi)}).