YOLO Vision 2026:

Reference for ultralytics/models/__init__.py#

Improvements

This page is sourced from https://github.com/ultralytics/ultralytics/blob/main/ultralytics/models/__init__.py. Have an improvement or example to add? Open a Pull Request — thank you! 🙏


Summary

Function ultralytics.models.__getattr__#

def __getattr__(name)

Lazy-import SAM so standard YOLO imports don't load optional torchvision internals.

GitHubultralytics/models/__init__.py
def __getattr__(name):
    """Lazy-import SAM so standard YOLO imports don't load optional torchvision internals."""
    if name == "SAM":
        # Scoped for import ultralytics speed: SAM pulls optional torchvision-heavy modules.
        from .sam import SAM

        return SAM
    raise AttributeError(f"module {__name__} has no attribute {name}")



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