[{'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:df = critics.copy()\ndf[\'fresh\'] = df.fresh == \'fresh\'\ngrp = df.groupby(\'critic\')\ncounts = grp.critic.count()  # number of reviews by each critic\nmeans = grp.fresh.mean()     # average freshness for each critic\nmeans[counts > 100].hist(bins=10, edgecolor=\'w\', lw=1)\nplt.xlabel("Average Rating per critic")\nplt.ylabel("Number of Critics")\nplt.yticks([0, 2, 4, 6, 8, 10]);'}, {'role': 'assistant', 'content': "['data_exploration']"}]