chore: import upstream snapshot with attribution

invokeai/app/shared/__init__.py

@@ -0,0 +1,5 @@
+"""
+This module contains various classes, functions and models which are shared across the app, particularly by invocations.
+
+Lifting these classes, functions and models into this shared module helps to reduce circular imports.
+"""

invokeai/app/shared/models.py

@@ -0,0 +1,16 @@
+from pydantic import BaseModel, Field
+
+from invokeai.app.invocations.fields import FieldDescriptions
+
+
+class FreeUConfig(BaseModel):
+    """
+    Configuration for the FreeU hyperparameters.
+    - https://huggingface.co/docs/diffusers/main/en/using-diffusers/freeu
+    - https://github.com/ChenyangSi/FreeU
+    """
+
+    s1: float = Field(ge=-1, le=3, description=FieldDescriptions.freeu_s1)
+    s2: float = Field(ge=-1, le=3, description=FieldDescriptions.freeu_s2)
+    b1: float = Field(ge=-1, le=3, description=FieldDescriptions.freeu_b1)
+    b2: float = Field(ge=-1, le=3, description=FieldDescriptions.freeu_b2)