Fix HyperparameterTuner to include ModelTrainer internal channels #5516
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HyperparameterTuner._build_training_job_definition() was only copying user-provided input channels, missing ModelTrainer's internal channels (code, sm_drivers). This caused tuning jobs to fail when using custom training scripts. - Add logic to include ModelTrainer's input_data_config channels - Refactor test_tuner.py with factory functions to reduce duplication - Add test for internal channels inclusion Fixes aws#5508
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nargokul
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Jan 29, 2026
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HyperparameterTuner._build_training_job_definition() was only copying user-provided input channels, missing ModelTrainer's internal channels (code, sm_drivers). This caused tuning jobs to fail when using custom training scripts.
Fixes #5508
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Description of changes:
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