[{'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:from stop_words import get_stop_words\nfrom nltk.stem.porter import PorterStemmer\nfrom gensim import corpora, models\nimport gensim\nimport nltk\nimport os\nfrom time import time\nfrom collections import defaultdict\nimport numpy as np\nimport pandas as pd\nimport gensim\nfrom gensim import corpora, utils\nfrom gensim.corpora.dictionary import Dictionary\nfrom gensim.models.wrappers.dtmmodel import DtmModel\nfrom sklearn.feature_extraction.text import TfidfVectorizer, CountVectorizer\nfrom sklearn.decomposition import NMF, LatentDirichletAllocation\nimport matplotlib\nimport matplotlib.pyplot as plt\nfrom dateutil import parser\nimport datetime\nimport random\n%matplotlib inline'}, {'role': 'assistant', 'content': 'helper_functions'}]