def _update_dict(initial_dict, update):
    """Updates dictionary with update content

    Args:
        initial_dict: initial dictionary
        update: updated dictionary
    """
    for key, value_list in update.items():
        if key in initial_dict:
            initial_dict[key].update(value_list)
        else:
            initial_dict[key] = set(value_list)
Updates dictionary with update content

    Args:
        initial_dict: initial dictionary
        update: updated dictionary
    
fiftyone/utils/eval/openimages.py