Fix DPM++ SDE not deterministic across different batch sizes (#5210)

modules/sd_samplers_kdiffusion.py

@@ -269,6 +269,16 @@ def get_sigmas(self, p, steps):
 
         return sigmas
 
+    def create_noise_sampler(self, x, sigmas, p):
+        """For DPM++ SDE: manually create noise sampler to enable deterministic results across different batch sizes"""
+        if shared.opts.no_dpmpp_sde_batch_determinism:
+            return None
+
+        from k_diffusion.sampling import BrownianTreeNoiseSampler
+        sigma_min, sigma_max = sigmas[sigmas > 0].min(), sigmas.max()
+        current_iter_seeds = p.all_seeds[p.iteration * p.batch_size:(p.iteration + 1) * p.batch_size]
+        return BrownianTreeNoiseSampler(x, sigma_min, sigma_max, seed=current_iter_seeds)
+
     def sample_img2img(self, p, x, noise, conditioning, unconditional_conditioning, steps=None, image_conditioning=None):
         steps, t_enc = sd_samplers_common.setup_img2img_steps(p, steps)
 
@@ -278,18 +288,24 @@ def sample_img2img(self, p, x, noise, conditioning, unconditional_conditioning,
         xi = x + noise * sigma_sched[0]
 
         extra_params_kwargs = self.initialize(p)
-        if 'sigma_min' in inspect.signature(self.func).parameters:
+        parameters = inspect.signature(self.func).parameters
+
+        if 'sigma_min' in parameters:
             ## last sigma is zero which isn't allowed by DPM Fast & Adaptive so taking value before last
             extra_params_kwargs['sigma_min'] = sigma_sched[-2]
-        if 'sigma_max' in inspect.signature(self.func).parameters:
+        if 'sigma_max' in parameters:
             extra_params_kwargs['sigma_max'] = sigma_sched[0]
-        if 'n' in inspect.signature(self.func).parameters:
+        if 'n' in parameters:
             extra_params_kwargs['n'] = len(sigma_sched) - 1
-        if 'sigma_sched' in inspect.signature(self.func).parameters:
+        if 'sigma_sched' in parameters:
             extra_params_kwargs['sigma_sched'] = sigma_sched
-        if 'sigmas' in inspect.signature(self.func).parameters:
+        if 'sigmas' in parameters:
             extra_params_kwargs['sigmas'] = sigma_sched
 
+        if self.funcname == 'sample_dpmpp_sde':
+            noise_sampler = self.create_noise_sampler(x, sigmas, p)
+            extra_params_kwargs['noise_sampler'] = noise_sampler
+
         self.model_wrap_cfg.init_latent = x
         self.last_latent = x
         extra_args={
@@ -303,22 +319,28 @@ def sample_img2img(self, p, x, noise, conditioning, unconditional_conditioning,
 
         return samples
 
-    def sample(self, p, x, conditioning, unconditional_conditioning, steps=None, image_conditioning = None):
+    def sample(self, p, x, conditioning, unconditional_conditioning, steps=None, image_conditioning=None):
         steps = steps or p.steps
 
         sigmas = self.get_sigmas(p, steps)
 
         x = x * sigmas[0]
 
         extra_params_kwargs = self.initialize(p)
-        if 'sigma_min' in inspect.signature(self.func).parameters:
+        parameters = inspect.signature(self.func).parameters
+
+        if 'sigma_min' in parameters:
             extra_params_kwargs['sigma_min'] = self.model_wrap.sigmas[0].item()
             extra_params_kwargs['sigma_max'] = self.model_wrap.sigmas[-1].item()
-            if 'n' in inspect.signature(self.func).parameters:
+            if 'n' in parameters:
                 extra_params_kwargs['n'] = steps
         else:
             extra_params_kwargs['sigmas'] = sigmas
 
+        if self.funcname == 'sample_dpmpp_sde':
+            noise_sampler = self.create_noise_sampler(x, sigmas, p)
+            extra_params_kwargs['noise_sampler'] = noise_sampler
+
         self.last_latent = x
         samples = self.launch_sampling(steps, lambda: self.func(self.model_wrap_cfg, x, extra_args={
             'cond': conditioning, 

modules/shared.py

@@ -414,6 +414,7 @@ def list_samplers():
 options_templates.update(options_section(('compatibility', "Compatibility"), {
     "use_old_emphasis_implementation": OptionInfo(False, "Use old emphasis implementation. Can be useful to reproduce old seeds."),
     "use_old_karras_scheduler_sigmas": OptionInfo(False, "Use old karras scheduler sigmas (0.1 to 10)."),
+    "no_dpmpp_sde_batch_determinism": OptionInfo(False, "Do not make DPM++ SDE deterministic across different batch sizes."),
     "use_old_hires_fix_width_height": OptionInfo(False, "For hires fix, use width/height sliders to set final resolution rather than first pass (disables Upscale by, Resize width/height to)."),
 }))