추론 함수와 CREATE MODEL 문의 기본 설정을 사용하면 ML 지식이 많지 않더라도 BigQuery ML 모델을 만들고 사용할 수 있습니다. 하지만 특성 추출 및 모델 학습과 같은 ML 개발 수명 주기에 관한 기본 지식을 갖추면 데이터와 모델을 모두 최적화하여 더 나은 결과를 얻을 수 있습니다. 다음 리소스를 사용하여 ML 기법과 프로세스에 익숙해지는 것이 좋습니다.
[[["이해하기 쉬움","easyToUnderstand","thumb-up"],["문제가 해결됨","solvedMyProblem","thumb-up"],["기타","otherUp","thumb-up"]],[["이해하기 어려움","hardToUnderstand","thumb-down"],["잘못된 정보 또는 샘플 코드","incorrectInformationOrSampleCode","thumb-down"],["필요한 정보/샘플이 없음","missingTheInformationSamplesINeed","thumb-down"],["번역 문제","translationIssue","thumb-down"],["기타","otherDown","thumb-down"]],["최종 업데이트: 2025-09-04(UTC)"],[[["\u003cp\u003eFeature preprocessing, encompassing both feature creation (engineering) and data cleaning, is a crucial step in the machine learning process.\u003c/p\u003e\n"],["\u003cp\u003eBigQuery ML offers automatic preprocessing during training, simplifying the process for users.\u003c/p\u003e\n"],["\u003cp\u003eManual preprocessing is also available in BigQuery ML, allowing for custom preprocessing definitions using the \u003ccode\u003eTRANSFORM\u003c/code\u003e clause and specific functions.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eML.FEATURE_INFO\u003c/code\u003e function enables users to retrieve statistics about the input feature columns.\u003c/p\u003e\n"],["\u003cp\u003eBasic knowledge of the ML development lifecycle, including feature engineering and model training, is recommended for better optimization of data and models.\u003c/p\u003e\n"]]],[],null,["# Feature preprocessing overview\n==============================\n\n*Feature preprocessing* is one of the most important steps in the machine\nlearning lifecycle. It consists of creating features and cleaning the training\ndata. Creating features is also referred as *feature engineering*.\n\nBigQuery ML provides the following feature preprocessing techniques:\n\n- **Automatic preprocessing** . BigQuery ML performs automatic\n preprocessing during training. For more information, see [Automatic feature\n preprocessing](/bigquery/docs/reference/standard-sql/bigqueryml-auto-preprocessing).\n\n- **Manual preprocessing** . You can use the [`TRANSFORM` clause](/bigquery/docs/reference/standard-sql/bigqueryml-syntax-create#transform)\n in the `CREATE MODEL` statement to define custom preprocessing using [manual\n preprocessing\n functions](/bigquery/docs/manual-preprocessing#types_of_preprocessing_functions).\n You can also use these functions outside of the `TRANSFORM` clause to\n process training data before creating the model.\n\nGet feature information\n-----------------------\n\nYou can use the [`ML.FEATURE_INFO`\nfunction](/bigquery/docs/reference/standard-sql/bigqueryml-syntax-feature) to\nretrieve the statistics of all input feature columns.\n\nRecommended knowledge\n---------------------\n\nBy using the default settings in the `CREATE MODEL` statements and the\ninference functions, you can create and use BigQuery ML models\neven without much ML knowledge. However, having basic knowledge about the\nML development lifecycle, such as feature engineering and model training,\nhelps you optimize both your data and your model to\ndeliver better results. We recommend using the following resources to develop\nfamiliarity with ML techniques and processes:\n\n- [Machine Learning Crash Course](https://developers.google.com/machine-learning/crash-course)\n- [Intro to Machine Learning](https://www.kaggle.com/learn/intro-to-machine-learning)\n- [Data Cleaning](https://www.kaggle.com/learn/data-cleaning)\n- [Feature Engineering](https://www.kaggle.com/learn/feature-engineering)\n- [Intermediate Machine Learning](https://www.kaggle.com/learn/intermediate-machine-learning)\n\nWhat's next\n-----------\n\nLearn about [feature serving](/bigquery/docs/feature-serving) in\nBigQuery ML."]]