[{'role': 'system', 'content': "You are an expert in machine learning and your task is to classify the code snippets into categories from the provided list of categories. List of categories: ['helper_functions', 'load_data', 'data_exploration', 'data_preprocessing', 'evaluation', 'modelling', 'prediction', 'result_visualization', 'save_results', 'comment_only']"}, {'role': 'user', 'content': "Identify to which category the provided code belongs and assign the code snippet to at least 1 but up to 5 categories based on the probabilities, ignore if the probability of the category is negligible. Strictly provide your response as a list. Avoid providing any additional information, commentary, or personal opinions.\\nPython Code:j=1\nfor i in [1, 18, 25, 35, 45, 50, 56]:\nmean = age[i].mean(axis=0)\nstd = age[i].std(axis=0)\npy.subplot(3, 3, j)\nplt.hist(age[i])\nplt.xlabel('Rating', fontsize=8)\nplt.ylabel('Frequency', fontsize=8)\nplt.title(r'Age: %s $\\mu=%2f,\\ \\sigma=%2f$' %(i, mean, std), fontsize=10)\nj = j+1\nplt.subplots_adjust(bottom=0.1, right=1.8, top=3.0, left=0.1)\nplt.show()"}, {'role': 'assistant', 'content': "['data_exploration']"}]