Move diffusers 'get_scheduler' import

lerobot/scripts/train.py

@@ -8,7 +8,6 @@ import hydra
 import torch
 from datasets import concatenate_datasets
 from datasets.utils import disable_progress_bars, enable_progress_bars
-from diffusers.optimization import get_scheduler
 
 from lerobot.common.datasets.factory import make_dataset
 from lerobot.common.datasets.utils import cycle
@@ -55,6 +54,8 @@ def make_optimizer_and_scheduler(cfg, policy):
             cfg.training.adam_weight_decay,
         )
         assert cfg.training.online_steps == 0, "Diffusion Policy does not handle online training."
+        from diffusers.optimization import get_scheduler
+
         lr_scheduler = get_scheduler(
             cfg.training.lr_scheduler,
             optimizer=optimizer,