Expose LR schedulers (#80)

* Expose schedulers

* Update __init__.py

Co-authored-by: Anton Lozhkov <[email protected]>

Author: osanseviero

src/diffusers/__init__.py

@@ -8,9 +8,19 @@
 
 from .modeling_utils import ModelMixin
 from .models import AutoencoderKL, UNet2DConditionModel, UNet2DModel, VQModel
+from .optimization import (
+    get_constant_schedule,
+    get_constant_schedule_with_warmup,
+    get_linear_schedule_with_warmup,
+    get_cosine_schedule_with_warmup,
+    get_cosine_with_hard_restarts_schedule_with_warmup,
+    get_polynomial_decay_schedule_with_warmup,
+    get_scheduler,
+)
 from .pipeline_utils import DiffusionPipeline
 from .pipelines import DDIMPipeline, DDPMPipeline, LDMPipeline, PNDMPipeline, ScoreSdeVePipeline
 from .schedulers import DDIMScheduler, DDPMScheduler, PNDMScheduler, SchedulerMixin, ScoreSdeVeScheduler
+from .training_utils import EMAModel
 
 
 if is_transformers_available():