[{'role': 'system', 'content': "You are an expert in machine learning and your task is to classify code snippets into one of the following categories: ['helper_functions', 'load_data', 'data_exploration', 'data_preprocessing', 'evaluation', 'modelling', 'prediction', 'result_visualization', 'save_results', 'comment_only']."}, {'role': 'user', 'content': "Identify the single most appropriate category to which the provided code belongs. Provide your response as a single category label without any additional information, commentary, or personal opinions.\\nPython Code:train_data_dir = '../input/dogs-vs-cats-redux-kernels-edition/train'\ntest_data_dir = '../input/dogs-vs-cats-redux-kernels-edition/test'\n\n# Make sure you include https://www.kaggle.com/keras/vgg16/data as your data source\nvgg_model_path = '../input/vgg16/vgg16_weights_tf_dim_ordering_tf_kernels_notop.h5'\n\nepochs = 20\nbatch_size = 20\nimg_width, img_height = 150, 150\n\ntraining_n_bound = 5000  # set to None to use the entire training dataset; it took about 2 hours at my Macbook Pro."}, {'role': 'assistant', 'content': 'helper_functions'}]