improve backward combability #936

backend/diffusion_engine/sd20.py

@@ -53,6 +53,10 @@ class StableDiffusion2(ForgeDiffusionEngine):
         # WebUI Legacy
         self.is_sd2 = True
         self.first_stage_model = vae.first_stage_model
+        self.alphas_cumprod = unet.model.predictor.alphas_cumprod
+
+        if not self.is_inpaint:
+            self.parameterization = 'v'
 
     def set_clip_skip(self, clip_skip):
         self.text_processing_engine.clip_skip = clip_skip