tch size defined by user.
    <li> rescale: How much to downsample the input image before feeding into the network.
    <li> dl_steps: Number of steps to run training for.
    <li> n_classes: Number of pose landmarks.
    <li> is_multi: Whether the project is multi-animal or single-animal.
    <li> max_n_animals: For multi-animal networks, the number of maximum animals in an image.
    <li> trainfilename: Name of the file that has the training data.
    <li> save_step: Number of steps after which to save mo