scheduler_classes = ()

forward_default_kwargs = ()

@property

def dummy_sample(self):

batch_size = 4

num_channels = 3

height = 8

width = 8

key1, key2 = random.split(random.PRNGKey(0))

sample = random.uniform(key1, (batch_size, num_channels, height, width))

return sample, key2

@property

def dummy_sample_deter(self):

batch_size = 4

num_channels = 3

height = 8

width = 8

num_elems = batch_size * num_channels * height * width

sample = jnp.arange(num_elems)

sample = sample.reshape(num_channels, height, width, batch_size)

sample = sample / num_elems

return jnp.transpose(sample, (3, 0, 1, 2))

def get_scheduler_config(self):

raise NotImplementedError

def dummy_model(self):

def model(sample, t, *args):

return sample * t / (t + 1)

return model

def check_over_configs(self, time_step=0, **config):

kwargs = dict(self.forward_default_kwargs)

num_inference_steps = kwargs.pop("num_inference_steps", None)

for scheduler_class in self.scheduler_classes:

sample, key = self.dummy_sample

residual = 0.1 * sample

scheduler_config = self.get_scheduler_config(**config)

scheduler = scheduler_class(**scheduler_config)

state = scheduler.create_state()

with tempfile.TemporaryDirectory() as tmpdirname:

scheduler.save_config(tmpdirname)

new_scheduler, new_state = scheduler_class.from_pretrained(tmpdirname)

if num_inference_steps is not None and hasattr(scheduler, "set_timesteps"):

state = scheduler.set_timesteps(state, num_inference_steps)

new_state = new_scheduler.set_timesteps(new_state, num_inference_steps)

elif num_inference_steps is not None and not hasattr(scheduler, "set_timesteps"):

kwargs["num_inference_steps"] = num_inference_steps

output = scheduler.step(state, residual, time_step, sample, key, **kwargs).prev_sample

new_output = new_scheduler.step(new_state, residual, time_step, sample, key, **kwargs).prev_sample

assert jnp.sum(jnp.abs(output - new_output)) < 1e-5, "Scheduler outputs are not identical"

def check_over_forward(self, time_step=0, **forward_kwargs):

kwargs = dict(self.forward_default_kwargs)

kwargs.update(forward_kwargs)

num_inference_steps = kwargs.pop("num_inference_steps", None)

for scheduler_class in self.scheduler_classes:

sample, key = self.dummy_sample

residual = 0.1 * sample

scheduler_config = self.get_scheduler_config()

scheduler = scheduler_class(**scheduler_config)

state = scheduler.create_state()

with tempfile.TemporaryDirectory() as tmpdirname:

scheduler.save_config(tmpdirname)

new_scheduler, new_state = scheduler_class.from_pretrained(tmpdirname)

if num_inference_steps is not None and hasattr(scheduler, "set_timesteps"):

state = scheduler.set_timesteps(state, num_inference_steps)

new_state = new_scheduler.set_timesteps(new_state, num_inference_steps)

elif num_inference_steps is not None and not hasattr(scheduler, "set_timesteps"):

kwargs["num_inference_steps"] = num_inference_steps

output = scheduler.step(state, residual, time_step, sample, key, **kwargs).prev_sample

new_output = new_scheduler.step(new_state, residual, time_step, sample, key, **kwargs).prev_sample

assert jnp.sum(jnp.abs(output - new_output)) < 1e-5, "Scheduler outputs are not identical"

def test_from_save_pretrained(self):

kwargs = dict(self.forward_default_kwargs)

num_inference_steps = kwargs.pop("num_inference_steps", None)

for scheduler_class in self.scheduler_classes:

sample, key = self.dummy_sample

residual = 0.1 * sample

scheduler_config = self.get_scheduler_config()

scheduler = scheduler_class(**scheduler_config)

state = scheduler.create_state()

with tempfile.TemporaryDirectory() as tmpdirname:

scheduler.save_config(tmpdirname)

new_scheduler, new_state = scheduler_class.from_pretrained(tmpdirname)

if num_inference_steps is not None and hasattr(scheduler, "set_timesteps"):

state = scheduler.set_timesteps(state, num_inference_steps)

new_state = new_scheduler.set_timesteps(new_state, num_inference_steps)

elif num_inference_steps is not None and not hasattr(scheduler, "set_timesteps"):

kwargs["num_inference_steps"] = num_inference_steps

output = scheduler.step(state, residual, 1, sample, key, **kwargs).prev_sample

new_output = new_scheduler.step(new_state, residual, 1, sample, key, **kwargs).prev_sample

assert jnp.sum(jnp.abs(output - new_output)) < 1e-5, "Scheduler outputs are not identical"

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)

state = scheduler.create_state()

sample, key = self.dummy_sample

residual = 0.1 * sample

if num_inference_steps is not None and hasattr(scheduler, "set_timesteps"):

state = scheduler.set_timesteps(state, num_inference_steps)

elif num_inference_steps is not None and not hasattr(scheduler, "set_timesteps"):

kwargs["num_inference_steps"] = num_inference_steps

output_0 = scheduler.step(state, residual, 0, sample, key, **kwargs).prev_sample

output_1 = scheduler.step(state, residual, 1, sample, key, **kwargs).prev_sample

self.assertEqual(output_0.shape, sample.shape)

self.assertEqual(output_0.shape, output_1.shape)

def test_scheduler_outputs_equivalence(self):

def set_nan_tensor_to_zero(t):

return t.at[t != t].set(0)

def recursive_check(tuple_object, dict_object):

if isinstance(tuple_object, (List, Tuple)):

for tuple_iterable_value, dict_iterable_value in zip(tuple_object, dict_object.values()):

recursive_check(tuple_iterable_value, dict_iterable_value)

elif isinstance(tuple_object, Dict):

for tuple_iterable_value, dict_iterable_value in zip(tuple_object.values(), dict_object.values()):

recursive_check(tuple_iterable_value, dict_iterable_value)

elif tuple_object is None:

return

else:

self.assertTrue(

jnp.allclose(set_nan_tensor_to_zero(tuple_object), set_nan_tensor_to_zero(dict_object), atol=1e-5),

msg=(

"Tuple and dict output are not equal. Difference:"

f" {jnp.max(jnp.abs(tuple_object - dict_object))}. Tuple has `nan`:"

f" {jnp.isnan(tuple_object).any()} and `inf`: {jnp.isinf(tuple_object)}. Dict has"

f" `nan`: {jnp.isnan(dict_object).any()} and `inf`: {jnp.isinf(dict_object)}."

),

)

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)

state = scheduler.create_state()

sample, key = self.dummy_sample

residual = 0.1 * sample

if num_inference_steps is not None and hasattr(scheduler, "set_timesteps"):

state = scheduler.set_timesteps(state, num_inference_steps)

elif num_inference_steps is not None and not hasattr(scheduler, "set_timesteps"):

kwargs["num_inference_steps"] = num_inference_steps

outputs_dict = scheduler.step(state, residual, 0, sample, key, **kwargs)

if num_inference_steps is not None and hasattr(scheduler, "set_timesteps"):

state = scheduler.set_timesteps(state, num_inference_steps)

elif num_inference_steps is not None and not hasattr(scheduler, "set_timesteps"):

kwargs["num_inference_steps"] = num_inference_steps

outputs_tuple = scheduler.step(state, residual, 0, sample, key, return_dict=False, **kwargs)

recursive_check(outputs_tuple[0], outputs_dict.prev_sample)

def test_deprecated_kwargs(self):

for scheduler_class in self.scheduler_classes:

has_kwarg_in_model_class = "kwargs" in inspect.signature(scheduler_class.__init__).parameters

has_deprecated_kwarg = len(scheduler_class._deprecated_kwargs) > 0

if has_kwarg_in_model_class and not has_deprecated_kwarg:

raise ValueError(

f"{scheduler_class} has `**kwargs` in its __init__ method but has not defined any deprecated"

" kwargs under the `_deprecated_kwargs` class attribute. Make sure to either remove `**kwargs` if"

" there are no deprecated arguments or add the deprecated argument with `_deprecated_kwargs ="

" [<deprecated_argument>]`"

)

if not has_kwarg_in_model_class and has_deprecated_kwarg:

raise ValueError(

f"{scheduler_class} doesn't have `**kwargs` in its __init__ method but has defined deprecated"

" kwargs under the `_deprecated_kwargs` class attribute. Make sure to either add the `**kwargs`"

f" argument to {self.model_class}.__init__ if there are deprecated arguments or remove the"

" deprecated argument from `_deprecated_kwargs = [<deprecated_argument>]`"

scheduler_classes = (FlaxDDPMScheduler,)

def get_scheduler_config(self, **kwargs):

config = {

"num_train_timesteps": 1000,

"beta_start": 0.0001,

"beta_end": 0.02,

"beta_schedule": "linear",

"variance_type": "fixed_small",

"clip_sample": True,

}

config.update(**kwargs)

return config

def test_timesteps(self):

for timesteps in [1, 5, 100, 1000]:

self.check_over_configs(num_train_timesteps=timesteps)

def test_betas(self):

for beta_start, beta_end in zip([0.0001, 0.001, 0.01, 0.1], [0.002, 0.02, 0.2, 2]):

self.check_over_configs(beta_start=beta_start, beta_end=beta_end)

def test_schedules(self):

for schedule in ["linear", "squaredcos_cap_v2"]:

self.check_over_configs(beta_schedule=schedule)

def test_variance_type(self):

for variance in ["fixed_small", "fixed_large", "other"]:

self.check_over_configs(variance_type=variance)

def test_clip_sample(self):

for clip_sample in [True, False]:

self.check_over_configs(clip_sample=clip_sample)

def test_time_indices(self):

for t in [0, 500, 999]:

self.check_over_forward(time_step=t)

def test_variance(self):

scheduler_class = self.scheduler_classes[0]

scheduler_config = self.get_scheduler_config()

scheduler = scheduler_class(**scheduler_config)

state = scheduler.create_state()

assert jnp.sum(jnp.abs(scheduler._get_variance(state, 0) - 0.0)) < 1e-5

assert jnp.sum(jnp.abs(scheduler._get_variance(state, 487) - 0.00979)) < 1e-5

assert jnp.sum(jnp.abs(scheduler._get_variance(state, 999) - 0.02)) < 1e-5

def test_full_loop_no_noise(self):

scheduler_class = self.scheduler_classes[0]

scheduler_config = self.get_scheduler_config()

scheduler = scheduler_class(**scheduler_config)

state = scheduler.create_state()

num_trained_timesteps = len(scheduler)

model = self.dummy_model()

sample = self.dummy_sample_deter

key1, key2 = random.split(random.PRNGKey(0))

for t in reversed(range(num_trained_timesteps)):

# 1. predict noise residual

residual = model(sample, t)

# 2. predict previous mean of sample x_t-1

output = scheduler.step(state, residual, t, sample, key1)

pred_prev_sample = output.prev_sample

state = output.state

key1, key2 = random.split(key2)

# if t > 0:

# noise = self.dummy_sample_deter

# variance = scheduler.get_variance(t) ** (0.5) * noise

#

# sample = pred_prev_sample + variance

sample = pred_prev_sample

result_sum = jnp.sum(jnp.abs(sample))

result_mean = jnp.mean(jnp.abs(sample))

if jax_device == "tpu":

assert abs(result_sum - 255.0714) < 1e-2

assert abs(result_mean - 0.332124) < 1e-3

else:

assert abs(result_sum - 255.1113) < 1e-2

scheduler_classes = (FlaxDDIMScheduler,)

forward_default_kwargs = (("num_inference_steps", 50),)

def get_scheduler_config(self, **kwargs):

config = {

"num_train_timesteps": 1000,

"beta_start": 0.0001,

"beta_end": 0.02,

"beta_schedule": "linear",

}

config.update(**kwargs)

return config

def full_loop(self, **config):

scheduler_class = self.scheduler_classes[0]

scheduler_config = self.get_scheduler_config(**config)

scheduler = scheduler_class(**scheduler_config)

state = scheduler.create_state()

key1, key2 = random.split(random.PRNGKey(0))

num_inference_steps = 10

model = self.dummy_model()

sample = self.dummy_sample_deter

state = scheduler.set_timesteps(state, num_inference_steps)

for t in state.timesteps:

residual = model(sample, t)

output = scheduler.step(state, residual, t, sample)

sample = output.prev_sample

state = output.state

key1, key2 = random.split(key2)

return sample

def check_over_configs(self, time_step=0, **config):

kwargs = dict(self.forward_default_kwargs)

num_inference_steps = kwargs.pop("num_inference_steps", None)

for scheduler_class in self.scheduler_classes:

sample, _ = self.dummy_sample

residual = 0.1 * sample

scheduler_config = self.get_scheduler_config(**config)

scheduler = scheduler_class(**scheduler_config)

state = scheduler.create_state()

with tempfile.TemporaryDirectory() as tmpdirname:

scheduler.save_config(tmpdirname)

new_scheduler, new_state = scheduler_class.from_pretrained(tmpdirname)

if num_inference_steps is not None and hasattr(scheduler, "set_timesteps"):

state = scheduler.set_timesteps(state, num_inference_steps)

new_state = new_scheduler.set_timesteps(new_state, num_inference_steps)

elif num_inference_steps is not None and not hasattr(scheduler, "set_timesteps"):

kwargs["num_inference_steps"] = num_inference_steps

output = scheduler.step(state, residual, time_step, sample, **kwargs).prev_sample

new_output = new_scheduler.step(new_state, residual, time_step, sample, **kwargs).prev_sample

assert jnp.sum(jnp.abs(output - new_output)) < 1e-5, "Scheduler outputs are not identical"

def test_from_save_pretrained(self):

kwargs = dict(self.forward_default_kwargs)

num_inference_steps = kwargs.pop("num_inference_steps", None)

for scheduler_class in self.scheduler_classes:

sample, _ = self.dummy_sample

residual = 0.1 * sample

scheduler_config = self.get_scheduler_config()

scheduler = scheduler_class(**scheduler_config)

state = scheduler.create_state()

with tempfile.TemporaryDirectory() as tmpdirname:

scheduler.save_config(tmpdirname)

new_scheduler, new_state = scheduler_class.from_pretrained(tmpdirname)

if num_inference_steps is not None and hasattr(scheduler, "set_timesteps"):

state = scheduler.set_timesteps(state, num_inference_steps)

new_state = new_scheduler.set_timesteps(new_state, num_inference_steps)

elif num_inference_steps is not None and not hasattr(scheduler, "set_timesteps"):

kwargs["num_inference_steps"] = num_inference_steps

output = scheduler.step(state, residual, 1, sample, **kwargs).prev_sample

new_output = new_scheduler.step(new_state, residual, 1, sample, **kwargs).prev_sample

assert jnp.sum(jnp.abs(output - new_output)) < 1e-5, "Scheduler outputs are not identical"

def check_over_forward(self, time_step=0, **forward_kwargs):

kwargs = dict(self.forward_default_kwargs)

kwargs.update(forward_kwargs)

num_inference_steps = kwargs.pop("num_inference_steps", None)

for scheduler_class in self.scheduler_classes:

sample, _ = self.dummy_sample

residual = 0.1 * sample

scheduler_config = self.get_scheduler_config()

scheduler = scheduler_class(**scheduler_config)

state = scheduler.create_state()

with tempfile.TemporaryDirectory() as tmpdirname:

scheduler.save_config(tmpdirname)

new_scheduler, new_state = scheduler_class.from_pretrained(tmpdirname)

if num_inference_steps is not None and hasattr(scheduler, "set_timesteps"):

state = scheduler.set_timesteps(state, num_inference_steps)

new_state = new_scheduler.set_timesteps(new_state, num_inference_steps)

elif num_inference_steps is not None and not hasattr(scheduler, "set_timesteps"):

kwargs["num_inference_steps"] = num_inference_steps

output = scheduler.step(state, residual, time_step, sample, **kwargs).prev_sample

new_output = new_scheduler.step(new_state, residual, time_step, sample, **kwargs).prev_sample

assert jnp.sum(jnp.abs(output - new_output)) < 1e-5, "Scheduler outputs are not identical"

def test_scheduler_outputs_equivalence(self):

def set_nan_tensor_to_zero(t):

return t.at[t != t].set(0)

def recursive_check(tuple_object, dict_object):

if isinstance(tuple_object, (List, Tuple)):

for tuple_iterable_value, dict_iterable_value in zip(tuple_object, dict_object.values()):

recursive_check(tuple_iterable_value, dict_iterable_value)

elif isinstance(tuple_object, Dict):

for tuple_iterable_value, dict_iterable_value in zip(tuple_object.values(), dict_object.values()):

recursive_check(tuple_iterable_value, dict_iterable_value)

elif tuple_object is None:

return

else:

self.assertTrue(

jnp.allclose(set_nan_tensor_to_zero(tuple_object), set_nan_tensor_to_zero(dict_object), atol=1e-5),

msg=(

"Tuple and dict output are not equal. Difference:"

f" {jnp.max(jnp.abs(tuple_object - dict_object))}. Tuple has `nan`:"

f" {jnp.isnan(tuple_object).any()} and `inf`: {jnp.isinf(tuple_object)}. Dict has"

f" `nan`: {jnp.isnan(dict_object).any()} and `inf`: {jnp.isinf(dict_object)}."

),

)

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)

state = scheduler.create_state()

sample, _ = self.dummy_sample

residual = 0.1 * sample

if num_inference_steps is not None and hasattr(scheduler, "set_timesteps"):

state = scheduler.set_timesteps(state, num_inference_steps)

elif num_inference_steps is not None and not hasattr(scheduler, "set_timesteps"):

kwargs["num_inference_steps"] = num_inference_steps

outputs_dict = scheduler.step(state, residual, 0, sample, **kwargs)

if num_inference_steps is not None and hasattr(scheduler, "set_timesteps"):

state = scheduler.set_timesteps(state, num_inference_steps)

elif num_inference_steps is not None and not hasattr(scheduler, "set_timesteps"):

kwargs["num_inference_steps"] = num_inference_steps

outputs_tuple = scheduler.step(state, residual, 0, sample, return_dict=False, **kwargs)

recursive_check(outputs_tuple[0], outputs_dict.prev_sample)

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)

state = scheduler.create_state()

sample, _ = self.dummy_sample

residual = 0.1 * sample

if num_inference_steps is not None and hasattr(scheduler, "set_timesteps"):

state = scheduler.set_timesteps(state, num_inference_steps)

elif num_inference_steps is not None and not hasattr(scheduler, "set_timesteps"):

kwargs["num_inference_steps"] = num_inference_steps

output_0 = scheduler.step(state, residual, 0, sample, **kwargs).prev_sample

output_1 = scheduler.step(state, residual, 1, sample, **kwargs).prev_sample

self.assertEqual(output_0.shape, sample.shape)

self.assertEqual(output_0.shape, output_1.shape)

def test_timesteps(self):

for timesteps in [100, 500, 1000]:

self.check_over_configs(num_train_timesteps=timesteps)

def test_steps_offset(self):

for steps_offset in [0, 1]:

self.check_over_configs(steps_offset=steps_offset)

scheduler_class = self.scheduler_classes[0]

scheduler_config = self.get_scheduler_config(steps_offset=1)

scheduler = scheduler_class(**scheduler_config)

state = scheduler.create_state()

state = scheduler.set_timesteps(state, 5)

assert jnp.equal(state.timesteps, jnp.array([801, 601, 401, 201, 1])).all()

def test_betas(self):

for beta_start, beta_end in zip([0.0001, 0.001, 0.01, 0.1], [0.002, 0.02, 0.2, 2]):

self.check_over_configs(beta_start=beta_start, beta_end=beta_end)

def test_schedules(self):

for schedule in ["linear", "squaredcos_cap_v2"]:

self.check_over_configs(beta_schedule=schedule)

def test_time_indices(self):

for t in [1, 10, 49]:

self.check_over_forward(time_step=t)

def test_inference_steps(self):

for t, num_inference_steps in zip([1, 10, 50], [10, 50, 500]):

self.check_over_forward(time_step=t, num_inference_steps=num_inference_steps)

def test_variance(self):

scheduler_class = self.scheduler_classes[0]

scheduler_config = self.get_scheduler_config()

scheduler = scheduler_class(**scheduler_config)

state = scheduler.create_state()

assert jnp.sum(jnp.abs(scheduler._get_variance(state, 0, 0) - 0.0)) < 1e-5

assert jnp.sum(jnp.abs(scheduler._get_variance(state, 420, 400) - 0.14771)) < 1e-5

assert jnp.sum(jnp.abs(scheduler._get_variance(state, 980, 960) - 0.32460)) < 1e-5

assert jnp.sum(jnp.abs(scheduler._get_variance(state, 0, 0) - 0.0)) < 1e-5

assert jnp.sum(jnp.abs(scheduler._get_variance(state, 487, 486) - 0.00979)) < 1e-5

assert jnp.sum(jnp.abs(scheduler._get_variance(state, 999, 998) - 0.02)) < 1e-5

def test_full_loop_no_noise(self):

sample = self.full_loop()

result_sum = jnp.sum(jnp.abs(sample))

result_mean = jnp.mean(jnp.abs(sample))

assert abs(result_sum - 172.0067) < 1e-2

assert abs(result_mean - 0.223967) < 1e-3

def test_full_loop_with_set_alpha_to_one(self):

# We specify different beta, so that the first alpha is 0.99

sample = self.full_loop(set_alpha_to_one=True, beta_start=0.01)

result_sum = jnp.sum(jnp.abs(sample))

result_mean = jnp.mean(jnp.abs(sample))

if jax_device == "tpu":

assert abs(result_sum - 149.8409) < 1e-2

assert abs(result_mean - 0.1951) < 1e-3

else:

assert abs(result_sum - 149.8295) < 1e-2

assert abs(result_mean - 0.1951) < 1e-3

def test_full_loop_with_no_set_alpha_to_one(self):

# We specify different beta, so that the first alpha is 0.99

sample = self.full_loop(set_alpha_to_one=False, beta_start=0.01)

result_sum = jnp.sum(jnp.abs(sample))

result_mean = jnp.mean(jnp.abs(sample))

if jax_device == "tpu":

pass

# FIXME: both result_sum and result_mean are nan on TPU

# assert jnp.isnan(result_sum)

# assert jnp.isnan(result_mean)

else:

assert abs(result_sum - 149.0784) < 1e-2

assert abs(result_mean - 0.1941) < 1e-3

def test_prediction_type(self):

for prediction_type in ["epsilon", "sample", "v_prediction"]:

scheduler_classes = (FlaxPNDMScheduler,)

forward_default_kwargs = (("num_inference_steps", 50),)

def get_scheduler_config(self, **kwargs):

config = {

"num_train_timesteps": 1000,

"beta_start": 0.0001,

"beta_end": 0.02,

"beta_schedule": "linear",

}

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 = jnp.array([residual + 0.2, residual + 0.15, residual + 0.1, residual + 0.05])

for scheduler_class in self.scheduler_classes:

scheduler_config = self.get_scheduler_config(**config)

scheduler = scheduler_class(**scheduler_config)

state = scheduler.create_state()

state = scheduler.set_timesteps(state, num_inference_steps, shape=sample.shape)

# copy over dummy past residuals

state = state.replace(ets=dummy_past_residuals[:])

with tempfile.TemporaryDirectory() as tmpdirname:

scheduler.save_config(tmpdirname)

new_scheduler, new_state = scheduler_class.from_pretrained(tmpdirname)

new_state = new_scheduler.set_timesteps(new_state, num_inference_steps, shape=sample.shape)

# copy over dummy past residuals

new_state = new_state.replace(ets=dummy_past_residuals[:])

(prev_sample, state) = scheduler.step_prk(state, residual, time_step, sample, **kwargs)

(new_prev_sample, new_state) = new_scheduler.step_prk(new_state, residual, time_step, sample, **kwargs)

assert jnp.sum(jnp.abs(prev_sample - new_prev_sample)) < 1e-5, "Scheduler outputs are not identical"

output, _ = scheduler.step_plms(state, residual, time_step, sample, **kwargs)

new_output, _ = new_scheduler.step_plms(new_state, residual, time_step, sample, **kwargs)

assert jnp.sum(jnp.abs(output - new_output)) < 1e-5, "Scheduler outputs are not identical"

def test_from_save_pretrained(self):

pass

def test_scheduler_outputs_equivalence(self):

def set_nan_tensor_to_zero(t):

return t.at[t != t].set(0)

def recursive_check(tuple_object, dict_object):

if isinstance(tuple_object, (List, Tuple)):

for tuple_iterable_value, dict_iterable_value in zip(tuple_object, dict_object.values()):

recursive_check(tuple_iterable_value, dict_iterable_value)

elif isinstance(tuple_object, Dict):

for tuple_iterable_value, dict_iterable_value in zip(tuple_object.values(), dict_object.values()):

recursive_check(tuple_iterable_value, dict_iterable_value)

elif tuple_object is None:

return

else:

self.assertTrue(

jnp.allclose(set_nan_tensor_to_zero(tuple_object), set_nan_tensor_to_zero(dict_object), atol=1e-5),

msg=(

"Tuple and dict output are not equal. Difference:"

f" {jnp.max(jnp.abs(tuple_object - dict_object))}. Tuple has `nan`:"

f" {jnp.isnan(tuple_object).any()} and `inf`: {jnp.isinf(tuple_object)}. Dict has"

f" `nan`: {jnp.isnan(dict_object).any()} and `inf`: {jnp.isinf(dict_object)}."

),

)

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)

state = scheduler.create_state()

sample, _ = self.dummy_sample

residual = 0.1 * sample

if num_inference_steps is not None and hasattr(scheduler, "set_timesteps"):

state = scheduler.set_timesteps(state, num_inference_steps, shape=sample.shape)

elif num_inference_steps is not None and not hasattr(scheduler, "set_timesteps"):

kwargs["num_inference_steps"] = num_inference_steps

outputs_dict = scheduler.step(state, residual, 0, sample, **kwargs)

if num_inference_steps is not None and hasattr(scheduler, "set_timesteps"):

state = scheduler.set_timesteps(state, num_inference_steps, shape=sample.shape)

elif num_inference_steps is not None and not hasattr(scheduler, "set_timesteps"):

kwargs["num_inference_steps"] = num_inference_steps

outputs_tuple = scheduler.step(state, residual, 0, sample, return_dict=False, **kwargs)

recursive_check(outputs_tuple[0], outputs_dict.prev_sample)

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 = jnp.array([residual + 0.2, residual + 0.15, residual + 0.1, residual + 0.05])

for scheduler_class in self.scheduler_classes:

scheduler_config = self.get_scheduler_config()

scheduler = scheduler_class(**scheduler_config)

state = scheduler.create_state()

state = scheduler.set_timesteps(state, num_inference_steps, shape=sample.shape)

# copy over dummy past residuals (must be after setting timesteps)

scheduler.ets = dummy_past_residuals[:]

with tempfile.TemporaryDirectory() as tmpdirname:

scheduler.save_config(tmpdirname)

new_scheduler, new_state = scheduler_class.from_pretrained(tmpdirname)

# copy over dummy past residuals

new_state = new_scheduler.set_timesteps(new_state, num_inference_steps, shape=sample.shape)

# copy over dummy past residual (must be after setting timesteps)

new_state.replace(ets=dummy_past_residuals[:])

output, state = scheduler.step_prk(state, residual, time_step, sample, **kwargs)

new_output, new_state = new_scheduler.step_prk(new_state, residual, time_step, sample, **kwargs)

assert jnp.sum(jnp.abs(output - new_output)) < 1e-5, "Scheduler outputs are not identical"

output, _ = scheduler.step_plms(state, residual, time_step, sample, **kwargs)

new_output, _ = new_scheduler.step_plms(new_state, residual, time_step, sample, **kwargs)

assert jnp.sum(jnp.abs(output - new_output)) < 1e-5, "Scheduler outputs are not identical"

def full_loop(self, **config):

scheduler_class = self.scheduler_classes[0]

scheduler_config = self.get_scheduler_config(**config)

scheduler = scheduler_class(**scheduler_config)

state = scheduler.create_state()

num_inference_steps = 10

model = self.dummy_model()

sample = self.dummy_sample_deter

state = scheduler.set_timesteps(state, num_inference_steps, shape=sample.shape)

for i, t in enumerate(state.prk_timesteps):

residual = model(sample, t)

sample, state = scheduler.step_prk(state, residual, t, sample)

for i, t in enumerate(state.plms_timesteps):

residual = model(sample, t)

sample, state = scheduler.step_plms(state, residual, t, sample)

return sample

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)

state = scheduler.create_state()

sample, _ = self.dummy_sample

residual = 0.1 * sample

if num_inference_steps is not None and hasattr(scheduler, "set_timesteps"):

state = scheduler.set_timesteps(state, num_inference_steps, shape=sample.shape)

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 = jnp.array([residual + 0.2, residual + 0.15, residual + 0.1, residual + 0.05])

state = state.replace(ets=dummy_past_residuals[:])

output_0, state = scheduler.step_prk(state, residual, 0, sample, **kwargs)

output_1, state = scheduler.step_prk(state, residual, 1, sample, **kwargs)

self.assertEqual(output_0.shape, sample.shape)

self.assertEqual(output_0.shape, output_1.shape)

output_0, state = scheduler.step_plms(state, residual, 0, sample, **kwargs)

output_1, state = scheduler.step_plms(state, residual, 1, sample, **kwargs)

self.assertEqual(output_0.shape, sample.shape)

self.assertEqual(output_0.shape, output_1.shape)

def test_timesteps(self):

for timesteps in [100, 1000]:

self.check_over_configs(num_train_timesteps=timesteps)

def test_steps_offset(self):

for steps_offset in [0, 1]:

self.check_over_configs(steps_offset=steps_offset)

scheduler_class = self.scheduler_classes[0]

scheduler_config = self.get_scheduler_config(steps_offset=1)

scheduler = scheduler_class(**scheduler_config)

state = scheduler.create_state()

state = scheduler.set_timesteps(state, 10, shape=())

assert jnp.equal(

state.timesteps,

jnp.array([901, 851, 851, 801, 801, 751, 751, 701, 701, 651, 651, 601, 601, 501, 401, 301, 201, 101, 1]),

).all()

def test_betas(self):

for beta_start, beta_end in zip([0.0001, 0.001], [0.002, 0.02]):

self.check_over_configs(beta_start=beta_start, beta_end=beta_end)

def test_schedules(self):

for schedule in ["linear", "squaredcos_cap_v2"]:

self.check_over_configs(beta_schedule=schedule)

def test_time_indices(self):

for t in [1, 5, 10]:

self.check_over_forward(time_step=t)

def test_inference_steps(self):

for t, num_inference_steps in zip([1, 5, 10], [10, 50, 100]):

self.check_over_forward(num_inference_steps=num_inference_steps)

def test_pow_of_3_inference_steps(self):

# earlier version of set_timesteps() caused an error indexing alpha's with inference steps as power of 3

num_inference_steps = 27

for scheduler_class in self.scheduler_classes:

sample, _ = self.dummy_sample

residual = 0.1 * sample

scheduler_config = self.get_scheduler_config()

scheduler = scheduler_class(**scheduler_config)

state = scheduler.create_state()

state = scheduler.set_timesteps(state, num_inference_steps, shape=sample.shape)

# before power of 3 fix, would error on first step, so we only need to do two

for i, t in enumerate(state.prk_timesteps[:2]):

sample, state = scheduler.step_prk(state, residual, t, sample)

def test_inference_plms_no_past_residuals(self):

with self.assertRaises(ValueError):

scheduler_class = self.scheduler_classes[0]

scheduler_config = self.get_scheduler_config()

scheduler = scheduler_class(**scheduler_config)

state = scheduler.create_state()

scheduler.step_plms(state, self.dummy_sample, 1, self.dummy_sample).prev_sample

def test_full_loop_no_noise(self):

sample = self.full_loop()

result_sum = jnp.sum(jnp.abs(sample))

result_mean = jnp.mean(jnp.abs(sample))

if jax_device == "tpu":

assert abs(result_sum - 198.1275) < 1e-2

assert abs(result_mean - 0.2580) < 1e-3

else:

assert abs(result_sum - 198.1318) < 1e-2

assert abs(result_mean - 0.2580) < 1e-3

def test_full_loop_with_set_alpha_to_one(self):

# We specify different beta, so that the first alpha is 0.99

sample = self.full_loop(set_alpha_to_one=True, beta_start=0.01)

result_sum = jnp.sum(jnp.abs(sample))

result_mean = jnp.mean(jnp.abs(sample))

if jax_device == "tpu":

assert abs(result_sum - 186.83226) < 1e-2

assert abs(result_mean - 0.24327) < 1e-3

else:

assert abs(result_sum - 186.9466) < 1e-2

assert abs(result_mean - 0.24342) < 1e-3

def test_full_loop_with_no_set_alpha_to_one(self):

# We specify different beta, so that the first alpha is 0.99

sample = self.full_loop(set_alpha_to_one=False, beta_start=0.01)

result_sum = jnp.sum(jnp.abs(sample))

result_mean = jnp.mean(jnp.abs(sample))

if jax_device == "tpu":

assert abs(result_sum - 186.83226) < 1e-2

assert abs(result_mean - 0.24327) < 1e-3

else:

assert abs(result_sum - 186.9482) < 1e-2