Ensure reward model has float dtype

src/smc/scorers/image_reward_utils.py

@@ -313,6 +313,9 @@ def rm_load(
     else:
         model = model.to_empty(device=device)
         model.load_state_dict(state_dict, strict=False)
+
+    # For some reason, sometimes the model params are loaded as bfloat16
+    model = model.float()
     
     print("checkpoint loaded")
     model.eval()