def get_model_data(model, model_dir):
    """Get topic state and keys files for a model."""
    model_num = model.replace('topics', '')
    keys_file_path = model_dir + '/' + model + '/keys' + model_num + '.txt'
    state_file_path = model_dir + '/' + model + '/topic-state' + model_num + '.gz'
    return state_file_path, keys_file_path