[{'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:trainHouses["distance_to_SF"] = d_to_SF\n#testHouses["distance_to_SF"] = np.sqrt((testHouses["latitude"] - SF[0])**2 + (testHouses["longitude"] - SF[1])**2)\ntestHouses["distance_to_SF"] = getDistanceFromLatLng(testHouses["latitude"], testHouses["longitude"], SF[0], SF[1])\ntrainHouses["distance_to_LA"] = d_to_LA\n#testHouses["distance_to_LA"] = np.sqrt((testHouses["latitude"] - LA[0])**2 + (testHouses["longitude"] - LA[1])**2)\ntestHouses["distance_to_LA"] = getDistanceFromLatLng(testHouses["latitude"], testHouses["longitude"], LA[0], LA[1])\ntrainHouses["distance_to_state_center"] = d_to_center\n#testHouses["distance_to_state_center"] = np.sqrt((testHouses["latitude"] - lat)**2 + (testHouses["longitude"] - long)**2)\ntestHouses["distance_to_state_center"] = getDistanceFromLatLng(testHouses["latitude"], testHouses["longitude"], lat, long)\ntrainHouses["distance_to_beverly_hills"] = d_to_BH\ntestHouses["distance_to_beverly_hills"] = getDistanceFromLatLng(testHouses["latitude"], testHouses["longitude"], Beverly_Hills[0], Beverly_Hills[1])'}, {'role': 'assistant', 'content': 'data_preprocessing'}]