fix

Update train_util.py

Update train_util.py

library/train_util.py

@@ -19,6 +19,7 @@
     Sequence,
     Tuple,
     Union,
+    Callable,
 )
 from accelerate import Accelerator, InitProcessGroupKwargs, DistributedDataParallelKwargs, PartialState
 import glob
@@ -5239,7 +5240,6 @@ def get_timesteps_and_huber_c(args, min_timestep, max_timestep, noise_scheduler,
             timesteps = time_shift(mu, 1.0, timesteps)
         else:
             timesteps = (timesteps * shift) / (1 + (shift - 1) * timesteps)
-        t = timesteps.view(-1, 1, 1, 1)
         timesteps = min_timestep + (timesteps * (max_timestep - min_timestep))
     else:
         timesteps = torch.randint(min_timestep, max_timestep, (b_size,), device="cpu")