GitLab

* Move FCN methods to itsown package.

* Fix lint.

* Move LRASPP methods to their own package.

* Move DeepLabV3 methods to their own package.

* Adding deprecation warning for torchvision.models.segmentation.segmentation.

* Refactoring deeplab.

* Setting aux default to false.

* Fixing imports.

* Passing backbones instead of backbone names to builders.

* Fixing mypy

* Addressing review comments.

* Correcting typing.

* Restoring special handling for references.