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import torch |
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from diffusers import HeunDiscreteScheduler |
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from diffusers.utils.testing_utils import torch_device |
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from .test_schedulers import SchedulerCommonTest |
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class HeunDiscreteSchedulerTest(SchedulerCommonTest): |
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scheduler_classes = (HeunDiscreteScheduler,) |
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num_inference_steps = 10 |
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def get_scheduler_config(self, **kwargs): |
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config = { |
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"num_train_timesteps": 1100, |
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"beta_start": 0.0001, |
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"beta_end": 0.02, |
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"beta_schedule": "linear", |
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} |
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config.update(**kwargs) |
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return config |
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def test_timesteps(self): |
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for timesteps in [10, 50, 100, 1000]: |
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self.check_over_configs(num_train_timesteps=timesteps) |
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def test_betas(self): |
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for beta_start, beta_end in zip([0.00001, 0.0001, 0.001], [0.0002, 0.002, 0.02]): |
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self.check_over_configs(beta_start=beta_start, beta_end=beta_end) |
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def test_schedules(self): |
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for schedule in ["linear", "scaled_linear", "exp"]: |
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self.check_over_configs(beta_schedule=schedule) |
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def test_clip_sample(self): |
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for clip_sample_range in [1.0, 2.0, 3.0]: |
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self.check_over_configs(clip_sample_range=clip_sample_range, clip_sample=True) |
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def test_prediction_type(self): |
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for prediction_type in ["epsilon", "v_prediction", "sample"]: |
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self.check_over_configs(prediction_type=prediction_type) |
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def full_loop(self, **config): |
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scheduler_class = self.scheduler_classes[0] |
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scheduler_config = self.get_scheduler_config(**config) |
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scheduler = scheduler_class(**scheduler_config) |
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num_inference_steps = self.num_inference_steps |
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scheduler.set_timesteps(num_inference_steps) |
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model = self.dummy_model() |
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sample = self.dummy_sample_deter * scheduler.init_noise_sigma |
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sample = sample.to(torch_device) |
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for i, t in enumerate(scheduler.timesteps): |
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sample = scheduler.scale_model_input(sample, t) |
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model_output = model(sample, t) |
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output = scheduler.step(model_output, t, sample) |
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sample = output.prev_sample |
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return sample |
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def full_loop_custom_timesteps(self, **config): |
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scheduler_class = self.scheduler_classes[0] |
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scheduler_config = self.get_scheduler_config(**config) |
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scheduler = scheduler_class(**scheduler_config) |
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num_inference_steps = self.num_inference_steps |
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scheduler.set_timesteps(num_inference_steps) |
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timesteps = scheduler.timesteps |
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timesteps = torch.cat([timesteps[:1], timesteps[1::2]]) |
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scheduler = scheduler_class(**scheduler_config) |
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scheduler.set_timesteps(num_inference_steps=None, timesteps=timesteps) |
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model = self.dummy_model() |
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sample = self.dummy_sample_deter * scheduler.init_noise_sigma |
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sample = sample.to(torch_device) |
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for i, t in enumerate(scheduler.timesteps): |
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sample = scheduler.scale_model_input(sample, t) |
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model_output = model(sample, t) |
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output = scheduler.step(model_output, t, sample) |
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sample = output.prev_sample |
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return sample |
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def test_full_loop_no_noise(self): |
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sample = self.full_loop() |
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result_sum = torch.sum(torch.abs(sample)) |
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result_mean = torch.mean(torch.abs(sample)) |
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if torch_device in ["cpu", "mps"]: |
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assert abs(result_sum.item() - 0.1233) < 1e-2 |
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assert abs(result_mean.item() - 0.0002) < 1e-3 |
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else: |
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assert abs(result_sum.item() - 0.1233) < 1e-2 |
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assert abs(result_mean.item() - 0.0002) < 1e-3 |
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def test_full_loop_with_v_prediction(self): |
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sample = self.full_loop(prediction_type="v_prediction") |
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result_sum = torch.sum(torch.abs(sample)) |
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result_mean = torch.mean(torch.abs(sample)) |
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if torch_device in ["cpu", "mps"]: |
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assert abs(result_sum.item() - 4.6934e-07) < 1e-2 |
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assert abs(result_mean.item() - 6.1112e-10) < 1e-3 |
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else: |
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assert abs(result_sum.item() - 4.693428650170972e-07) < 1e-2 |
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assert abs(result_mean.item() - 0.0002) < 1e-3 |
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def test_full_loop_device(self): |
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scheduler_class = self.scheduler_classes[0] |
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scheduler_config = self.get_scheduler_config() |
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scheduler = scheduler_class(**scheduler_config) |
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scheduler.set_timesteps(self.num_inference_steps, device=torch_device) |
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model = self.dummy_model() |
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sample = self.dummy_sample_deter.to(torch_device) * scheduler.init_noise_sigma |
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for t in scheduler.timesteps: |
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sample = scheduler.scale_model_input(sample, t) |
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model_output = model(sample, t) |
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output = scheduler.step(model_output, t, sample) |
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sample = output.prev_sample |
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result_sum = torch.sum(torch.abs(sample)) |
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result_mean = torch.mean(torch.abs(sample)) |
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if str(torch_device).startswith("cpu"): |
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assert abs(result_sum.item() - 0.1233) < 1e-2 |
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assert abs(result_mean.item() - 0.0002) < 1e-3 |
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elif str(torch_device).startswith("mps"): |
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assert abs(result_mean.item() - 0.0002) < 1e-2 |
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else: |
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assert abs(result_sum.item() - 0.1233) < 1e-2 |
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assert abs(result_mean.item() - 0.0002) < 1e-3 |
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def test_full_loop_device_karras_sigmas(self): |
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scheduler_class = self.scheduler_classes[0] |
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scheduler_config = self.get_scheduler_config() |
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scheduler = scheduler_class(**scheduler_config, use_karras_sigmas=True) |
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scheduler.set_timesteps(self.num_inference_steps, device=torch_device) |
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model = self.dummy_model() |
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sample = self.dummy_sample_deter.to(torch_device) * scheduler.init_noise_sigma |
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sample = sample.to(torch_device) |
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for t in scheduler.timesteps: |
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sample = scheduler.scale_model_input(sample, t) |
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model_output = model(sample, t) |
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output = scheduler.step(model_output, t, sample) |
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sample = output.prev_sample |
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result_sum = torch.sum(torch.abs(sample)) |
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result_mean = torch.mean(torch.abs(sample)) |
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assert abs(result_sum.item() - 0.00015) < 1e-2 |
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assert abs(result_mean.item() - 1.9869554535034695e-07) < 1e-2 |
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def test_full_loop_with_noise(self): |
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scheduler_class = self.scheduler_classes[0] |
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scheduler_config = self.get_scheduler_config() |
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scheduler = scheduler_class(**scheduler_config) |
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scheduler.set_timesteps(self.num_inference_steps) |
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model = self.dummy_model() |
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sample = self.dummy_sample_deter * scheduler.init_noise_sigma |
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sample = sample.to(torch_device) |
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t_start = self.num_inference_steps - 2 |
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noise = self.dummy_noise_deter |
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noise = noise.to(torch_device) |
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timesteps = scheduler.timesteps[t_start * scheduler.order :] |
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sample = scheduler.add_noise(sample, noise, timesteps[:1]) |
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for i, t in enumerate(timesteps): |
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sample = scheduler.scale_model_input(sample, t) |
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model_output = model(sample, t) |
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output = scheduler.step(model_output, t, sample) |
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sample = output.prev_sample |
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result_sum = torch.sum(torch.abs(sample)) |
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result_mean = torch.mean(torch.abs(sample)) |
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assert abs(result_sum.item() - 75074.8906) < 1e-2, f" expected result sum 75074.8906, but get {result_sum}" |
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assert abs(result_mean.item() - 97.7538) < 1e-3, f" expected result mean 97.7538, but get {result_mean}" |
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def test_custom_timesteps(self): |
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for prediction_type in ["epsilon", "sample", "v_prediction"]: |
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for timestep_spacing in ["linspace", "leading"]: |
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sample = self.full_loop( |
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prediction_type=prediction_type, |
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timestep_spacing=timestep_spacing, |
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) |
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sample_custom_timesteps = self.full_loop_custom_timesteps( |
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prediction_type=prediction_type, |
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timestep_spacing=timestep_spacing, |
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) |
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assert ( |
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torch.sum(torch.abs(sample - sample_custom_timesteps)) < 1e-5 |
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), f"Scheduler outputs are not identical for prediction_type: {prediction_type}, timestep_spacing: {timestep_spacing}" |
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