Where does function linear_schedule comes from?

<img width="1034" height="847" alt="Image" src="https://github.com/user-attachments/assets/8ca34196-bbc6-468e-a91d-61402f1177bb" />

I'm trying to figure out how hyper params affect results, but I don't know what python packages provide function `linear_schedule`. Could anyone tell me which package should I install to import `utils` package?