wip: Add LCMScheduler

docs/index.md

@@ -198,6 +198,7 @@ The list of schedulers has been completely revamped and brought up to date:
 | **dpmpp_2m**   | DPMSolverMultistepScheduler     | original noise scnedule     |
 | **dpmpp_2m_k** | DPMSolverMultistepScheduler     | using karras noise schedule |
 | **unipc**      | UniPCMultistepScheduler         | CPU only                    |
+| **lcm**        | LCMScheduler                    |                             |
 
 Please see [3.0.0 Release Notes](https://github.com/invoke-ai/InvokeAI/releases/tag/v3.0.0) for further details.
 

invokeai/backend/install/legacy_arg_parsing.py

@@ -38,6 +38,7 @@ SAMPLER_CHOICES = [
     "k_heun",
     "k_lms",
     "plms",
+    "lcm",
 ]
 
 PRECISION_CHOICES = [

invokeai/backend/stable_diffusion/schedulers/schedulers.py

@@ -10,6 +10,7 @@ from diffusers import (
     HeunDiscreteScheduler,
     KDPM2AncestralDiscreteScheduler,
     KDPM2DiscreteScheduler,
+    LCMScheduler,
     LMSDiscreteScheduler,
     PNDMScheduler,
     UniPCMultistepScheduler,
@@ -38,4 +39,5 @@ SCHEDULER_MAP = dict(
     dpmpp_sde=(DPMSolverSDEScheduler, dict(use_karras_sigmas=False, noise_sampler_seed=0)),
     dpmpp_sde_k=(DPMSolverSDEScheduler, dict(use_karras_sigmas=True, noise_sampler_seed=0)),
     unipc=(UniPCMultistepScheduler, dict(cpu_only=True)),
+    lcm=(LCMScheduler, dict()),
 )

invokeai/frontend/web/src/features/parameters/types/parameterSchemas.ts

@@ -132,6 +132,7 @@ export const zScheduler = z.enum([
   'lms_k',
   'euler_a',
   'kdpm_2_a',
+  'lcm',
 ]);
 /**
  * Type alias for scheduler parameter, inferred from its zod schema
@@ -166,6 +167,7 @@ export const SCHEDULER_LABEL_MAP: Record<SchedulerParam, string> = {
   lms_k: 'LMS Karras',
   euler_a: 'Euler Ancestral',
   kdpm_2_a: 'KDPM 2 Ancestral',
+  lcm: 'LCM',
 };
 
 /**