Fix an issue when alphas_comprod are half floats.

comfy/k_diffusion/external.py

@@ -134,7 +134,7 @@ class CompVisDenoiser(DiscreteEpsDDPMDenoiser):
     """A wrapper for CompVis diffusion models."""
 
     def __init__(self, model, quantize=False, device='cpu'):
-        super().__init__(model, model.alphas_cumprod, quantize=quantize)
+        super().__init__(model, model.alphas_cumprod.float(), quantize=quantize)
 
     def get_eps(self, *args, **kwargs):
         return self.inner_model.apply_model(*args, **kwargs)
@@ -173,7 +173,7 @@ class CompVisVDenoiser(DiscreteVDDPMDenoiser):
     """A wrapper for CompVis diffusion models that output v."""
 
     def __init__(self, model, quantize=False, device='cpu'):
-        super().__init__(model, model.alphas_cumprod, quantize=quantize)
+        super().__init__(model, model.alphas_cumprod.float(), quantize=quantize)
 
     def get_v(self, x, t, cond, **kwargs):
         return self.inner_model.apply_model(x, t, cond)