import tempfile import torch from diffusers import ( DEISMultistepScheduler, DPMSolverMultistepScheduler, DPMSolverSinglestepScheduler, UniPCMultistepScheduler, ) from .test_schedulers import SchedulerCommonTest class DPMSolverSinglestepSchedulerTest(SchedulerCommonTest): scheduler_classes = (DPMSolverSinglestepScheduler,) forward_default_kwargs = (("num_inference_steps", 25),) def get_scheduler_config(self, **kwargs): config = { "num_train_timesteps": 1000, "beta_start": 0.0001, "beta_end": 0.02, "beta_schedule": "linear", "solver_order": 2, "prediction_type": "epsilon", "thresholding": False, "sample_max_value": 1.0, "algorithm_type": "dpmsolver++", "solver_type": "midpoint", "lambda_min_clipped": -float("inf"), "variance_type": None, "final_sigmas_type": "sigma_min", } config.update(**kwargs) return config def check_over_configs(self, time_step=0, **config): kwargs = dict(self.forward_default_kwargs) num_inference_steps = kwargs.pop("num_inference_steps", None) sample = self.dummy_sample residual = 0.1 * sample dummy_past_residuals = [residual + 0.2, residual + 0.15, residual + 0.10] for scheduler_class in self.scheduler_classes: scheduler_config = self.get_scheduler_config(**config) scheduler = scheduler_class(**scheduler_config) scheduler.set_timesteps(num_inference_steps) # copy over dummy past residuals scheduler.model_outputs = dummy_past_residuals[: scheduler.config.solver_order] with tempfile.TemporaryDirectory() as tmpdirname: scheduler.save_config(tmpdirname) new_scheduler = scheduler_class.from_pretrained(tmpdirname) new_scheduler.set_timesteps(num_inference_steps) # copy over dummy past residuals new_scheduler.model_outputs = dummy_past_residuals[: new_scheduler.config.solver_order] output, new_output = sample, sample for t in range(time_step, time_step + scheduler.config.solver_order + 1): t = scheduler.timesteps[t] output = scheduler.step(residual, t, output, **kwargs).prev_sample new_output = new_scheduler.step(residual, t, new_output, **kwargs).prev_sample assert torch.sum(torch.abs(output - new_output)) < 1e-5, "Scheduler outputs are not identical" def test_from_save_pretrained(self): pass def check_over_forward(self, time_step=0, **forward_kwargs): kwargs = dict(self.forward_default_kwargs) num_inference_steps = kwargs.pop("num_inference_steps", None) sample = self.dummy_sample residual = 0.1 * sample dummy_past_residuals = [residual + 0.2, residual + 0.15, residual + 0.10] for scheduler_class in self.scheduler_classes: scheduler_config = self.get_scheduler_config() scheduler = scheduler_class(**scheduler_config) scheduler.set_timesteps(num_inference_steps) # copy over dummy past residuals (must be after setting timesteps) scheduler.model_outputs = dummy_past_residuals[: scheduler.config.solver_order] with tempfile.TemporaryDirectory() as tmpdirname: scheduler.save_config(tmpdirname) new_scheduler = scheduler_class.from_pretrained(tmpdirname) # copy over dummy past residuals new_scheduler.set_timesteps(num_inference_steps) # copy over dummy past residual (must be after setting timesteps) new_scheduler.model_outputs = dummy_past_residuals[: new_scheduler.config.solver_order] output = scheduler.step(residual, time_step, sample, **kwargs).prev_sample new_output = new_scheduler.step(residual, time_step, sample, **kwargs).prev_sample assert torch.sum(torch.abs(output - new_output)) < 1e-5, "Scheduler outputs are not identical" def full_loop(self, scheduler=None, **config): if scheduler is None: scheduler_class = self.scheduler_classes[0] scheduler_config = self.get_scheduler_config(**config) scheduler = scheduler_class(**scheduler_config) num_inference_steps = 10 model = self.dummy_model() sample = self.dummy_sample_deter scheduler.set_timesteps(num_inference_steps) for i, t in enumerate(scheduler.timesteps): residual = model(sample, t) sample = scheduler.step(residual, t, sample).prev_sample return sample def full_loop_custom_timesteps(self, **config): scheduler_class = self.scheduler_classes[0] scheduler_config = self.get_scheduler_config(**config) scheduler = scheduler_class(**scheduler_config) num_inference_steps = 10 scheduler.set_timesteps(num_inference_steps) timesteps = scheduler.timesteps # reset the timesteps using`timesteps` scheduler = scheduler_class(**scheduler_config) scheduler.set_timesteps(num_inference_steps=None, timesteps=timesteps) model = self.dummy_model() sample = self.dummy_sample_deter for i, t in enumerate(scheduler.timesteps): residual = model(sample, t) sample = scheduler.step(residual, t, sample).prev_sample return sample def test_full_uneven_loop(self): scheduler = DPMSolverSinglestepScheduler(**self.get_scheduler_config()) num_inference_steps = 50 model = self.dummy_model() sample = self.dummy_sample_deter scheduler.set_timesteps(num_inference_steps) # make sure that the first t is uneven for i, t in enumerate(scheduler.timesteps[3:]): residual = model(sample, t) sample = scheduler.step(residual, t, sample).prev_sample result_mean = torch.mean(torch.abs(sample)) assert abs(result_mean.item() - 0.2574) < 1e-3 def test_timesteps(self): for timesteps in [25, 50, 100, 999, 1000]: self.check_over_configs(num_train_timesteps=timesteps) def test_switch(self): # make sure that iterating over schedulers with same config names gives same results # for defaults scheduler = DPMSolverSinglestepScheduler(**self.get_scheduler_config()) sample = self.full_loop(scheduler=scheduler) result_mean = torch.mean(torch.abs(sample)) assert abs(result_mean.item() - 0.2791) < 1e-3 scheduler = DEISMultistepScheduler.from_config(scheduler.config) scheduler = DPMSolverMultistepScheduler.from_config(scheduler.config) scheduler = UniPCMultistepScheduler.from_config(scheduler.config) scheduler = DPMSolverSinglestepScheduler.from_config(scheduler.config) sample = self.full_loop(scheduler=scheduler) result_mean = torch.mean(torch.abs(sample)) assert abs(result_mean.item() - 0.2791) < 1e-3 def test_thresholding(self): self.check_over_configs(thresholding=False) for order in [1, 2, 3]: for solver_type in ["midpoint", "heun"]: for threshold in [0.5, 1.0, 2.0]: for prediction_type in ["epsilon", "sample"]: self.check_over_configs( thresholding=True, prediction_type=prediction_type, sample_max_value=threshold, algorithm_type="dpmsolver++", solver_order=order, solver_type=solver_type, ) def test_prediction_type(self): for prediction_type in ["epsilon", "v_prediction"]: self.check_over_configs(prediction_type=prediction_type) def test_solver_order_and_type(self): for algorithm_type in ["dpmsolver", "dpmsolver++"]: for solver_type in ["midpoint", "heun"]: for order in [1, 2, 3]: for prediction_type in ["epsilon", "sample"]: self.check_over_configs( solver_order=order, solver_type=solver_type, prediction_type=prediction_type, algorithm_type=algorithm_type, ) sample = self.full_loop( solver_order=order, solver_type=solver_type, prediction_type=prediction_type, algorithm_type=algorithm_type, ) assert not torch.isnan(sample).any(), "Samples have nan numbers" def test_lower_order_final(self): self.check_over_configs(lower_order_final=True) self.check_over_configs(lower_order_final=False) def test_lambda_min_clipped(self): self.check_over_configs(lambda_min_clipped=-float("inf")) self.check_over_configs(lambda_min_clipped=-5.1) def test_variance_type(self): self.check_over_configs(variance_type=None) self.check_over_configs(variance_type="learned_range") def test_inference_steps(self): for num_inference_steps in [1, 2, 3, 5, 10, 50, 100, 999, 1000]: self.check_over_forward(num_inference_steps=num_inference_steps, time_step=0) def test_full_loop_no_noise(self): sample = self.full_loop() result_mean = torch.mean(torch.abs(sample)) assert abs(result_mean.item() - 0.2791) < 1e-3 def test_full_loop_with_karras(self): sample = self.full_loop(use_karras_sigmas=True) result_mean = torch.mean(torch.abs(sample)) assert abs(result_mean.item() - 0.2248) < 1e-3 def test_full_loop_with_v_prediction(self): sample = self.full_loop(prediction_type="v_prediction") result_mean = torch.mean(torch.abs(sample)) assert abs(result_mean.item() - 0.1453) < 1e-3 def test_full_loop_with_karras_and_v_prediction(self): sample = self.full_loop(prediction_type="v_prediction", use_karras_sigmas=True) result_mean = torch.mean(torch.abs(sample)) assert abs(result_mean.item() - 0.0649) < 1e-3 def test_fp16_support(self): scheduler_class = self.scheduler_classes[0] scheduler_config = self.get_scheduler_config(thresholding=True, dynamic_thresholding_ratio=0) scheduler = scheduler_class(**scheduler_config) num_inference_steps = 10 model = self.dummy_model() sample = self.dummy_sample_deter.half() scheduler.set_timesteps(num_inference_steps) for i, t in enumerate(scheduler.timesteps): residual = model(sample, t) sample = scheduler.step(residual, t, sample).prev_sample assert sample.dtype == torch.float16 def test_step_shape(self): kwargs = dict(self.forward_default_kwargs) num_inference_steps = kwargs.pop("num_inference_steps", None) for scheduler_class in self.scheduler_classes: scheduler_config = self.get_scheduler_config() scheduler = scheduler_class(**scheduler_config) sample = self.dummy_sample residual = 0.1 * sample if num_inference_steps is not None and hasattr(scheduler, "set_timesteps"): scheduler.set_timesteps(num_inference_steps) elif num_inference_steps is not None and not hasattr(scheduler, "set_timesteps"): kwargs["num_inference_steps"] = num_inference_steps # copy over dummy past residuals (must be done after set_timesteps) dummy_past_residuals = [residual + 0.2, residual + 0.15, residual + 0.10] scheduler.model_outputs = dummy_past_residuals[: scheduler.config.solver_order] time_step_0 = scheduler.timesteps[0] time_step_1 = scheduler.timesteps[1] output_0 = scheduler.step(residual, time_step_0, sample, **kwargs).prev_sample output_1 = scheduler.step(residual, time_step_1, sample, **kwargs).prev_sample self.assertEqual(output_0.shape, sample.shape) self.assertEqual(output_0.shape, output_1.shape) def test_full_loop_with_noise(self): scheduler_class = self.scheduler_classes[0] scheduler_config = self.get_scheduler_config() scheduler = scheduler_class(**scheduler_config) num_inference_steps = 10 t_start = 5 model = self.dummy_model() sample = self.dummy_sample_deter scheduler.set_timesteps(num_inference_steps) # add noise noise = self.dummy_noise_deter timesteps = scheduler.timesteps[t_start * scheduler.order :] sample = scheduler.add_noise(sample, noise, timesteps[:1]) for i, t in enumerate(timesteps): residual = model(sample, t) sample = scheduler.step(residual, t, sample).prev_sample result_sum = torch.sum(torch.abs(sample)) result_mean = torch.mean(torch.abs(sample)) assert abs(result_sum.item() - 269.2187) < 1e-2, f" expected result sum 269.2187, but get {result_sum}" assert abs(result_mean.item() - 0.3505) < 1e-3, f" expected result mean 0.3505, but get {result_mean}" def test_custom_timesteps(self): for prediction_type in ["epsilon", "sample", "v_prediction"]: for lower_order_final in [True, False]: for final_sigmas_type in ["sigma_min", "zero"]: sample = self.full_loop( prediction_type=prediction_type, lower_order_final=lower_order_final, final_sigmas_type=final_sigmas_type, ) sample_custom_timesteps = self.full_loop_custom_timesteps( prediction_type=prediction_type, lower_order_final=lower_order_final, final_sigmas_type=final_sigmas_type, ) assert ( torch.sum(torch.abs(sample - sample_custom_timesteps)) < 1e-5 ), f"Scheduler outputs are not identical for prediction_type: {prediction_type}, lower_order_final: {lower_order_final} and final_sigmas_type: {final_sigmas_type}"