[{'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 fillna_with_prediction(X):\nfor field in X:\nif X[field].dtype == "object":\ncontinue\nif not X[field].isnull().any():\ncontinue\nX_full = X.dropna()\ny_full = X_full.pop(field)\nmodel = RandomForestRegressor(n_jobs=-1, n_estimators=1000, random_state=42)\nmodel.fit(X_full, y_full)\nX_null = X[X[field].isnull()]\nX_null.pop(field)\ny_null = model.predict(X_null)\nindexes = X[X[field].isnull()].index.tolist()\ny_null_series = pd.Series(y_null, index=indexes)\nX[field] = X[field].fillna(value=y_null_series)\nreturn X'}, {'role': 'assistant', 'content': 'data_preprocessing'}]