Minimum learning rate

[Vaios Laschos]

The minimum learning rate is the same as the "max". Is this intentional or a mistake? If yes, why (you can skip explanation if it is too bothersome)?

[Zhang Peiyuan]

This is a mistake made by us and thanks a million for spotting that out!（by right it should be 4e-5）
Fortunately, we are still at the very early stage of training and there is still room to correct it. I have corrected this mistake, and the TinyLlama's lr curve will look like below:

I will update the readme pointing to this issue together with the release of the 500B-token checkpoint later.