[{'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:#current public score is 0.66,this should be improved\n#checking the variance of each feature\ntrain1 = train\ntest1 = test\nsel = VarianceThreshold(threshold=(.8 * (1 - .8)))\nsel.fit_transform(train1)\n\ntrain1.head(40)\n\n#this is based on this article ,https://scikit-learn.org/stable/modules/feature_selection.html\n#could see no rows being removed in the data set,as all of them have valid values,non null.\n'}, {'role': 'assistant', 'content': 'modelling'}]