[{'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:import numpy as np \nimport pandas as pd\nfrom sklearn.model_selection import KFold\nfrom sklearn.metrics import accuracy_score\nfrom sklearn.ensemble import AdaBoostClassifier\nfrom sklearn.ensemble import RandomForestClassifier\nfrom sklearn.ensemble import AdaBoostClassifier\nfrom sklearn.ensemble import GradientBoostingClassifier\nfrom sklearn.ensemble import ExtraTreesClassifier\n\n\n\nfrom sklearn.preprocessing import MinMaxScaler\nfrom sklearn.preprocessing import StandardScaler\nfrom sklearn.preprocessing import QuantileTransformer\nfrom sklearn.decomposition import PCA\nfrom sklearn.preprocessing import RobustScaler\nfrom sklearn.preprocessing import KernelCenterer\n\nfrom sklearn import svm'}, {'role': 'assistant', 'content': 'helper_functions'}]