@ptrblck  Thanks for the quick reply! I linked that thread in my OP, but I dont think there are any solutions there for checkpoint_sequential only for checkpoint.
Is this anything more than a cosmetic issue? Like does this break my backpropagation or just complains that my input has no gradients, so it cannot checkpoint that which it shouldn’t in the first place.
The error message is unclear:

“UserWarning: None of the inputs have requires_grad=True. Gradients will be None”


does this apply to just the one layer (the input) which I dont care about or all subsequent layers?