[{'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:for i in df_train.groupby('season').count().index:\n    s = 's'+str(i)\n    a=[]\n    for j in df_train.season:\n        if j==i:\n            a.append(1)\n        else:\n            a.append(0)\n    df_train[s]=a\ndf_train.sample(5)"}, {'role': 'assistant', 'content': "['data_preprocessing']"}]