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Fix base_model_arn construction to use private hub when SAGEMAKER_HUB_NAME is set #5836

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Fix base_model_arn construction to use private hub when SAGEMAKER_HUB_NAME is set #5836

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7 changes: 5 additions & 2 deletions sagemaker-train/src/sagemaker/train/common_utils/model_resolution.py
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Original file line number Diff line number Diff line change
Expand Up @@ -211,8 +211,11 @@ def _resolve_model_package_object(self, model_package: 'ModelPackage') -> _Model
arn_parts = model_pkg_arn.split(':')
if len(arn_parts) >= 4:
region = arn_parts[3]
# Construct hub content ARN for SageMaker public hub
base_model_arn = f"arn:aws:sagemaker:{region}:aws:hub-content/SageMakerPublicHub/Model/{hub_content_name}/{hub_content_version}"
# Use SAGEMAKER_HUB_NAME if set (private hub), otherwise fall back to public hub
hub_name = os.environ.get("SAGEMAKER_HUB_NAME", "SageMakerPublicHub")
# Private hubs are account-scoped; public hub uses 'aws' as account
hub_account = "aws" if hub_name == "SageMakerPublicHub" else arn_parts[4]
base_model_arn = f"arn:aws:sagemaker:{region}:{hub_account}:hub-content/{hub_name}/Model/{hub_content_name}/{hub_content_version}"

# If we couldn't extract or construct base model ARN, this is not a supported model package
if not base_model_arn:
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