Bring your own model with Amazon SageMaker AI: Script mode in SDK v3
AWS SageMaker SDK v3 replaces framework-specific estimators with unified ModelTrainer and ModelBuilder classes
AWS released SageMaker Python SDK v3 with a unified API that consolidates framework-specific classes (SKLearn, PyTorch, XGBoost) into single ModelTrainer and ModelBuilder abstractions, enabling code injection at runtime without container rebuilds. The new SourceCode object syncs local directories into training jobs dynamically, reducing iteration friction for custom model workflows. This is a developer experience improvement for ML practitioners on AWS, not a strategic AI industry signal.