Yes, unless you really have integer tensors somewhere, which is highly unlikely, you can ignore this warning.
This warning is added for when converting from torch models jitted by torch.jit.script(...). In script, there is no way to tell the type of input tensors, so we just assume it is float tensors. If you use torch.jit.trace(), torch knows the type of input tensors, so there is no problem.
But there are lots of other warning (free variables related) coming from c++. For now, the only way to turn them off is manually commenting out the log.