[{'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:image_filenames = []\nfor i in range(1, 51):\nimage_filename = 'data/test/test_%d' % i + '/test_%d' % i + '.png'\nimage_filenames.append(image_filename)\nimages_test = [np.pad(load_image(image_filename), ((pad,pad),(pad,pad),(0,0)), 'constant')\nfor image_filename in image_filenames]"}, {'role': 'assistant', 'content': 'load_data'}]