[{'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:def word_cloud(state = None):\nif state == None:\nstate_df = df\nelse:\nstate.lower()\nif state == \'tx\' or state == \'texas\':\nstate = \'.tx|texas\'\nelif state == \'ca\' or state == \'california\':\nstate = \'.ca|california\'\nstate_df = df[df[\'location\'].str.contains(\'.{}\'.format(state))]\nwords = state_df[\'hashtags\'][(state_df[\'hashtags\'].isnull() == False) & (state_df[\'hashtags\'] != \'None\')]\nstopwords = set(STOPWORDS)\nwc = WordCloud(width=1600, height=800, background_color=\'white\', \\\nrelative_scaling=1, stopwords=stopwords, colormap=\'copper\').generate(\' \'.join(i for i in words))\nplt.figure(figsize=(20,10))\nplt.imshow(wc)\nplt.axis("off")\nplt.show()\nreturn'}, {'role': 'assistant', 'content': 'data_exploration'}]