chunk_content: e preprocessing functions over the entire dataset, use the 🤗 Datasets set_transform function:
  
  
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  train_ds.set_transform(train_transforms)
  test_ds.set_transform(val_transforms)
  
  Create evaluation function
  	
  Including a metric during training is helpful for evaluating your model’s performance. You can load an evaluation
  method with the 🤗 Evaluate library. For this task, use
  the mean Intersection over Union (IoU) metric (see the 🤗 Evaluate
  