fix a bug in the new version (#957)

remove tensor_format in the new version

examples/text_to_image/train_text_to_image.py

@@ -375,7 +375,7 @@ def main():
 
     # TODO (patil-suraj): load scheduler using args
     noise_scheduler = DDPMScheduler(
-        beta_start=0.00085, beta_end=0.012, beta_schedule="scaled_linear", num_train_timesteps=1000, tensor_format="pt"
+        beta_start=0.00085, beta_end=0.012, beta_schedule="scaled_linear", num_train_timesteps=1000
     )
 
     # Get the datasets: you can either provide your own training and evaluation files (see below)