Your company, with limited machine learning expertise, is exploring BigQuery ML for its simplicity and managed service features to kickstart its ML journey. The team is currently assessing the platform's capabilities to ensure it aligns with various project requirements that involve designing and deploying models using a range of techniques and algorithms. Given the constraints of needing a solution that is both scalable and compliant with data governance policies, which of the following techniques or algorithms is not supported by BigQuery ML? Choose the best option.