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[Flax] initial flax scheduler test #580

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[Flax] initial flax scheduler test #580

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cabd53b
initial flax scheduler test
kashif Sep 19, 2022
56b7111
FlaxDDIMSchedulerTest
kashif Sep 20, 2022
7e333f1
added initial FlaxPNDMSchedulerTest
kashif Sep 20, 2022
f7a5bf0
fix style
kashif Sep 20, 2022
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20 changes: 13 additions & 7 deletions src/diffusers/schedulers/scheduling_pndm_flax.py
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Original file line number Diff line number Diff line change
Expand Up @@ -64,10 +64,10 @@ class PNDMSchedulerState:
timesteps: Optional[jnp.ndarray] = None

# running values
cur_model_output: Optional[jnp.ndarray] = None
cur_model_output: jnp.ndarray = jnp.array([0])
counter: int = 0
cur_sample: Optional[jnp.ndarray] = None
ets: jnp.ndarray = jnp.array([])
cur_sample: Optional[jnp.ndarray] = None

@classmethod
def create(cls, num_train_timesteps: int):
Expand Down Expand Up @@ -268,14 +268,16 @@ def step_prk(
if state.counter % 4 == 0:
state = state.replace(
cur_model_output=state.cur_model_output + 1 / 6 * model_output,
ets=state.ets.append(model_output),
ets=jnp.concatenate((state.ets, model_output[None, ...]), 0)
if len(state.ets) > 0
else model_output[None, ...],
cur_sample=sample,
)
elif (self.counter - 1) % 4 == 0:
elif (state.counter - 1) % 4 == 0:
state = state.replace(cur_model_output=state.cur_model_output + 1 / 3 * model_output)
elif (self.counter - 2) % 4 == 0:
elif (state.counter - 2) % 4 == 0:
state = state.replace(cur_model_output=state.cur_model_output + 1 / 3 * model_output)
elif (self.counter - 3) % 4 == 0:
elif (state.counter - 3) % 4 == 0:
model_output = state.cur_model_output + 1 / 6 * model_output
state = state.replace(cur_model_output=0)

Expand Down Expand Up @@ -331,7 +333,11 @@ def step_plms(
prev_timestep = timestep - self.config.num_train_timesteps // state.num_inference_steps

if state.counter != 1:
state = state.replace(ets=state.ets.append(model_output))
state = state.replace(
ets=jnp.concatenate((state.ets, model_output[None, ...]), 0)
if len(state.ets) > 0
else model_output[None, ...]
)
else:
prev_timestep = timestep
timestep = timestep + self.config.num_train_timesteps // state.num_inference_steps
Expand Down
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