chunk_content: DIR="path-to-save-model"
  Here: 
  INSTANCE_DIR: The directory containing the images that you intend to use for training your model.
  CLASS_DIR: The directory containing class-specific images. In this example, we use prior preservation to avoid overfitting and language-drift. For prior preservation, you need other images of the same class as part of the training process. However, these images can be generated and the training script will save them 