[scheduler] fix some scheduler dtype error (#2992)

Co-authored-by: wangguan <dizhipeng.dzp@alibaba-inc.com>
Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>

src/diffusers/schedulers/scheduling_k_dpm_2_ancestral_discrete.py

@@ -201,7 +201,7 @@ class KDPM2AncestralDiscreteScheduler(SchedulerMixin, ConfigMixin):
         else:
             timesteps = torch.from_numpy(timesteps).to(device)
 
-        timesteps_interpol = self.sigma_to_t(sigmas_interpol).to(device)
+        timesteps_interpol = self.sigma_to_t(sigmas_interpol).to(device, dtype=timesteps.dtype)
         interleaved_timesteps = torch.stack((timesteps_interpol[:-2, None], timesteps[1:, None]), dim=-1).flatten()
 
         self.timesteps = torch.cat([timesteps[:1], interleaved_timesteps])

src/diffusers/schedulers/scheduling_k_dpm_2_discrete.py

@@ -190,7 +190,7 @@ class KDPM2DiscreteScheduler(SchedulerMixin, ConfigMixin):
             timesteps = torch.from_numpy(timesteps).to(device)
 
         # interpolate timesteps
-        timesteps_interpol = self.sigma_to_t(sigmas_interpol).to(device)
+        timesteps_interpol = self.sigma_to_t(sigmas_interpol).to(device, dtype=timesteps.dtype)
         interleaved_timesteps = torch.stack((timesteps_interpol[1:-1, None], timesteps[1:, None]), dim=-1).flatten()
 
         self.timesteps = torch.cat([timesteps[:1], interleaved_timesteps])