fix: support for loading playground v2.5 single file checkpoint. (#7230)

* fix: support for loading playground v2.5 single file checkpoint.

* remove is_playground_model.

* fix: edm key

* apply Dhruv's comments but errors.

* fix: things.

* delegate model_type inference to a function.

* address Dhruv's comment.

* address rest of the comments.

* fix: kwargs

* fix

* update

---------
Co-authored-by: DN6 <dhruv.nair@gmail.com>

src/diffusers/loaders/single_file.py

@@ -63,13 +63,20 @@ def build_sub_model_components(
             num_in_channels=num_in_channels,
             image_size=image_size,
             torch_dtype=torch_dtype,
+            model_type=model_type,
         )
         return unet_components
 
     if component_name == "vae":
         scaling_factor = kwargs.get("scaling_factor", None)
         vae_components = create_diffusers_vae_model_from_ldm(
-            pipeline_class_name, original_config, checkpoint, image_size, scaling_factor, torch_dtype
+            pipeline_class_name,
+            original_config,
+            checkpoint,
+            image_size,
+            scaling_factor,
+            torch_dtype,
+            model_type=model_type,
         )
         return vae_components
 
@@ -124,11 +131,12 @@ def build_sub_model_components(
 def set_additional_components(
     pipeline_class_name,
     original_config,
+    checkpoint=None,
     model_type=None,
 ):
     components = {}
     if pipeline_class_name in REFINER_PIPELINES:
-        model_type = infer_model_type(original_config, model_type=model_type)
+        model_type = infer_model_type(original_config, checkpoint=checkpoint, model_type=model_type)
         is_refiner = model_type == "SDXL-Refiner"
         components.update(
             {

src/diffusers/loaders/single_file_utils.py

@@ -28,6 +28,7 @@ from ..schedulers import (
     DDIMScheduler,
     DDPMScheduler,
     DPMSolverMultistepScheduler,
+    EDMDPMSolverMultistepScheduler,
     EulerAncestralDiscreteScheduler,
     EulerDiscreteScheduler,
     HeunDiscreteScheduler,
@@ -175,6 +176,7 @@ DIFFUSERS_TO_LDM_MAPPING = {
 
 LDM_VAE_KEY = "first_stage_model."
 LDM_VAE_DEFAULT_SCALING_FACTOR = 0.18215
+PLAYGROUND_VAE_SCALING_FACTOR = 0.5
 LDM_UNET_KEY = "model.diffusion_model."
 LDM_CONTROLNET_KEY = "control_model."
 LDM_CLIP_PREFIX_TO_REMOVE = ["cond_stage_model.transformer.", "conditioner.embedders.0.transformer."]
@@ -305,7 +307,7 @@ def fetch_original_config(pipeline_class_name, checkpoint, original_config_file=
     return original_config
 
 
-def infer_model_type(original_config, model_type=None):
+def infer_model_type(original_config, checkpoint=None, model_type=None):
     if model_type is not None:
         return model_type
 
@@ -323,7 +325,9 @@ def infer_model_type(original_config, model_type=None):
 
     elif has_network_config:
         context_dim = original_config["model"]["params"]["network_config"]["params"]["context_dim"]
-        if context_dim == 2048:
+        if "edm_mean" in checkpoint and "edm_std" in checkpoint:
+            model_type = "Playground"
+        elif context_dim == 2048:
             model_type = "SDXL"
         else:
             model_type = "SDXL-Refiner"
@@ -344,13 +348,13 @@ def set_image_size(pipeline_class_name, original_config, checkpoint, image_size=
         return image_size
 
     global_step = checkpoint["global_step"] if "global_step" in checkpoint else None
-    model_type = infer_model_type(original_config, model_type)
+    model_type = infer_model_type(original_config, checkpoint, model_type)
 
     if pipeline_class_name == "StableDiffusionUpscalePipeline":
         image_size = original_config["model"]["params"]["unet_config"]["params"]["image_size"]
         return image_size
 
-    elif model_type in ["SDXL", "SDXL-Refiner"]:
+    elif model_type in ["SDXL", "SDXL-Refiner", "Playground"]:
         image_size = 1024
         return image_size
 
@@ -506,12 +510,14 @@ def create_controlnet_diffusers_config(original_config, image_size: int):
     return controlnet_config
 
 
-def create_vae_diffusers_config(original_config, image_size, scaling_factor=None):
+def create_vae_diffusers_config(original_config, image_size, scaling_factor=None, latents_mean=None, latents_std=None):
     """
     Creates a config for the diffusers based on the config of the LDM model.
     """
     vae_params = original_config["model"]["params"]["first_stage_config"]["params"]["ddconfig"]
-    if scaling_factor is None and "scale_factor" in original_config["model"]["params"]:
+    if (scaling_factor is None) and (latents_mean is not None) and (latents_std is not None):
+        scaling_factor = PLAYGROUND_VAE_SCALING_FACTOR
+    elif (scaling_factor is None) and ("scale_factor" in original_config["model"]["params"]):
         scaling_factor = original_config["model"]["params"]["scale_factor"]
     elif scaling_factor is None:
         scaling_factor = LDM_VAE_DEFAULT_SCALING_FACTOR
@@ -531,6 +537,8 @@ def create_vae_diffusers_config(original_config, image_size, scaling_factor=None
         "layers_per_block": vae_params["num_res_blocks"],
         "scaling_factor": scaling_factor,
     }
+    if latents_mean is not None and latents_std is not None:
+        config.update({"latents_mean": latents_mean, "latents_std": latents_std})
 
     return config
 
@@ -1172,6 +1180,7 @@ def create_diffusers_unet_model_from_ldm(
     extract_ema=False,
     image_size=None,
     torch_dtype=None,
+    model_type=None,
 ):
     from ..models import UNet2DConditionModel
 
@@ -1190,7 +1199,9 @@ def create_diffusers_unet_model_from_ldm(
         else:
             num_in_channels = 4
 
-    image_size = set_image_size(pipeline_class_name, original_config, checkpoint, image_size=image_size)
+    image_size = set_image_size(
+        pipeline_class_name, original_config, checkpoint, image_size=image_size, model_type=model_type
+    )
     unet_config = create_unet_diffusers_config(original_config, image_size=image_size)
     unet_config["in_channels"] = num_in_channels
     unet_config["upcast_attention"] = upcast_attention
@@ -1223,14 +1234,40 @@ def create_diffusers_unet_model_from_ldm(
 
 
 def create_diffusers_vae_model_from_ldm(
-    pipeline_class_name, original_config, checkpoint, image_size=None, scaling_factor=None, torch_dtype=None
+    pipeline_class_name,
+    original_config,
+    checkpoint,
+    image_size=None,
+    scaling_factor=None,
+    torch_dtype=None,
+    model_type=None,
 ):
     # import here to avoid circular imports
     from ..models import AutoencoderKL
 
-    image_size = set_image_size(pipeline_class_name, original_config, checkpoint, image_size=image_size)
+    image_size = set_image_size(
+        pipeline_class_name, original_config, checkpoint, image_size=image_size, model_type=model_type
+    )
+    model_type = infer_model_type(original_config, checkpoint, model_type)
 
-    vae_config = create_vae_diffusers_config(original_config, image_size=image_size, scaling_factor=scaling_factor)
+    if model_type == "Playground":
+        edm_mean = (
+            checkpoint["edm_mean"].to(dtype=torch_dtype).tolist() if torch_dtype else checkpoint["edm_mean"].tolist()
+        )
+        edm_std = (
+            checkpoint["edm_std"].to(dtype=torch_dtype).tolist() if torch_dtype else checkpoint["edm_std"].tolist()
+        )
+    else:
+        edm_mean = None
+        edm_std = None
+
+    vae_config = create_vae_diffusers_config(
+        original_config,
+        image_size=image_size,
+        scaling_factor=scaling_factor,
+        latents_mean=edm_mean,
+        latents_std=edm_std,
+    )
     diffusers_format_vae_checkpoint = convert_ldm_vae_checkpoint(checkpoint, vae_config)
     ctx = init_empty_weights if is_accelerate_available() else nullcontext
 
@@ -1265,7 +1302,7 @@ def create_text_encoders_and_tokenizers_from_ldm(
     local_files_only=False,
     torch_dtype=None,
 ):
-    model_type = infer_model_type(original_config, model_type=model_type)
+    model_type = infer_model_type(original_config, checkpoint=checkpoint, model_type=model_type)
 
     if model_type == "FrozenOpenCLIPEmbedder":
         config_name = "stabilityai/stable-diffusion-2"
@@ -1332,7 +1369,7 @@ def create_text_encoders_and_tokenizers_from_ldm(
                 "text_encoder_2": text_encoder_2,
             }
 
-    elif model_type == "SDXL":
+    elif model_type in ["SDXL", "Playground"]:
         try:
             config_name = "openai/clip-vit-large-patch14"
             tokenizer = CLIPTokenizer.from_pretrained(config_name, local_files_only=local_files_only)
@@ -1383,7 +1420,7 @@ def create_scheduler_from_ldm(
     model_type=None,
 ):
     scheduler_config = get_default_scheduler_config()
-    model_type = infer_model_type(original_config, model_type=model_type)
+    model_type = infer_model_type(original_config, checkpoint=checkpoint, model_type=model_type)
 
     global_step = checkpoint["global_step"] if "global_step" in checkpoint else None
 
@@ -1406,7 +1443,8 @@ def create_scheduler_from_ldm(
 
     if model_type in ["SDXL", "SDXL-Refiner"]:
         scheduler_type = "euler"
-
+    elif model_type == "Playground":
+        scheduler_type = "edm_dpm_solver_multistep"
     else:
         beta_start = original_config["model"]["params"].get("linear_start", 0.02)
         beta_end = original_config["model"]["params"].get("linear_end", 0.085)
@@ -1438,6 +1476,26 @@ def create_scheduler_from_ldm(
     elif scheduler_type == "ddim":
         scheduler = DDIMScheduler.from_config(scheduler_config)
 
+    elif scheduler_type == "edm_dpm_solver_multistep":
+        scheduler_config = {
+            "algorithm_type": "dpmsolver++",
+            "dynamic_thresholding_ratio": 0.995,
+            "euler_at_final": False,
+            "final_sigmas_type": "zero",
+            "lower_order_final": True,
+            "num_train_timesteps": 1000,
+            "prediction_type": "epsilon",
+            "rho": 7.0,
+            "sample_max_value": 1.0,
+            "sigma_data": 0.5,
+            "sigma_max": 80.0,
+            "sigma_min": 0.002,
+            "solver_order": 2,
+            "solver_type": "midpoint",
+            "thresholding": False,
+        }
+        scheduler = EDMDPMSolverMultistepScheduler(**scheduler_config)
+
     else:
         raise ValueError(f"Scheduler of type {scheduler_type} doesn't exist!")