remove realesrgan dep

iopaint/plugins/basicsr/__init__.py

@@ -0,0 +1,22 @@
+"""
+Adapted from https://github.com/XPixelGroup/BasicSR
+License: Apache-2.0
+
+As of Feb 2024, `basicsr` appears to be unmaintained. It imports a function from `torchvision` that is removed in
+`torchvision` 0.17. Here is the deprecation warning:
+
+    UserWarning: The torchvision.transforms.functional_tensor module is deprecated in 0.15 and will be **removed in
+    0.17**. Please don't rely on it. You probably just need to use APIs in torchvision.transforms.functional or in
+    torchvision.transforms.v2.functional.
+
+As a result, a dependency on `basicsr` means we cannot keep our `torchvision` dependency up to date.
+
+Because we only rely on a single class `RRDBNet` from `basicsr`, we've copied the relevant code here and removed the
+dependency on `basicsr`.
+
+The code is almost unchanged, only a few type annotations have been added. The license is also copied.
+
+Copy From InvokeAI
+"""
+
+from .rrdbnet_arch import RRDBNet