Working inference node with quantized bnb nf4 checkpoint

invokeai/app/invocations/flux_text_to_image.py

@@ -89,7 +89,7 @@ def _run_diffusion(
         img, img_ids = self._prepare_latent_img_patches(x)
 
         # HACK(ryand): Find a better way to determine if this is a schnell model or not.
-        is_schnell = "shnell" in transformer_info.config.path if transformer_info.config else ""
+        is_schnell = "schnell" in transformer_info.config.path if transformer_info.config else ""
         timesteps = get_schedule(
             num_steps=self.num_steps,
             image_seq_len=img.shape[1],
@@ -139,9 +139,9 @@ def _prepare_latent_img_patches(self, latent_img: torch.Tensor) -> tuple[torch.T
             img = repeat(img, "1 ... -> bs ...", bs=bs)
 
         # Generate patch position ids.
-        img_ids = torch.zeros(h // 2, w // 2, 3)
-        img_ids[..., 1] = img_ids[..., 1] + torch.arange(h // 2)[:, None]
-        img_ids[..., 2] = img_ids[..., 2] + torch.arange(w // 2)[None, :]
+        img_ids = torch.zeros(h // 2, w // 2, 3, device=img.device)
+        img_ids[..., 1] = img_ids[..., 1] + torch.arange(h // 2, device=img.device)[:, None]
+        img_ids[..., 2] = img_ids[..., 2] + torch.arange(w // 2, device=img.device)[None, :]
         img_ids = repeat(img_ids, "h w c -> b (h w) c", b=bs)
 
         return img, img_ids
@@ -155,8 +155,10 @@ def _run_vae_decoding(
         with vae_info as vae:
             assert isinstance(vae, AutoEncoder)
             # TODO(ryand): Test that this works with both float16 and bfloat16.
-            with torch.autocast(device_type=latents.device.type, dtype=TorchDevice.choose_torch_dtype()):
-                img = vae.decode(latents)
+            # with torch.autocast(device_type=latents.device.type, dtype=torch.float32):
+            vae.to(torch.float32)
+            latents.to(torch.float32)
+            img = vae.decode(latents)
 
         img.clamp(-1, 1)
         img = rearrange(img[0], "c h w -> h w c")

invokeai/backend/model_manager/load/model_loaders/flux.py

@@ -1,6 +1,8 @@
 # Copyright (c) 2024, Brandon W. Rising and the InvokeAI Development Team
 """Class for Flux model loading in InvokeAI."""
 
+import accelerate
+import torch
 from dataclasses import fields
 from pathlib import Path
 from typing import Any, Optional
@@ -24,13 +26,15 @@
     CheckpointConfigBase,
     CLIPEmbedDiffusersConfig,
     MainCheckpointConfig,
+    MainBnbQuantized4bCheckpointConfig,
     T5EncoderConfig,
     VAECheckpointConfig,
 )
 from invokeai.backend.model_manager.load.model_loader_registry import ModelLoaderRegistry
 from invokeai.backend.model_manager.load.model_loaders.generic_diffusers import GenericDiffusersLoader
 from invokeai.backend.util.devices import TorchDevice
 from invokeai.backend.util.silence_warnings import SilenceWarnings
+from invokeai.backend.quantization.bnb_nf4 import quantize_model_nf4
 
 app_config = get_config()
 
@@ -62,7 +66,7 @@ def _load_model(
             with SilenceWarnings():
                 model = load_class(params).to(self._torch_dtype)
                 # load_sft doesn't support torch.device
-                sd = load_file(model_path, device=str(TorchDevice.choose_torch_device()))
+                sd = load_file(model_path)
                 model.load_state_dict(sd, strict=False, assign=True)
 
             return model
@@ -105,9 +109,9 @@ def _load_model(
 
         match submodel_type:
             case SubModelType.Tokenizer2:
-                return T5Tokenizer.from_pretrained(Path(config.path) / "encoder", max_length=512)
+                return T5Tokenizer.from_pretrained(Path(config.path) / "tokenizer_2", max_length=512)
             case SubModelType.TextEncoder2:
-                return T5EncoderModel.from_pretrained(Path(config.path) / "tokenizer")
+                return T5EncoderModel.from_pretrained(Path(config.path) / "text_encoder_2") #TODO: Fix hf subfolder install
 
         raise Exception("Only Checkpoint Flux models are currently supported.")
 
@@ -152,7 +156,55 @@ def _load_from_singlefile(
 
         with SilenceWarnings():
             model = load_class(params).to(self._torch_dtype)
-            # load_sft doesn't support torch.device
-            sd = load_file(model_path, device=str(TorchDevice.choose_torch_device()))
+            sd = load_file(model_path)
+            model.load_state_dict(sd, strict=False, assign=True)
+        return model
+
+
+@ModelLoaderRegistry.register(base=BaseModelType.Flux, type=ModelType.Main, format=ModelFormat.BnbQuantizednf4b)
+class FluxBnbQuantizednf4bCheckpointModel(GenericDiffusersLoader):
+    """Class to load main models."""
+
+    def _load_model(
+        self,
+        config: AnyModelConfig,
+        submodel_type: Optional[SubModelType] = None,
+    ) -> AnyModel:
+        if not isinstance(config, CheckpointConfigBase):
+            raise Exception("Only Checkpoint Flux models are currently supported.")
+        legacy_config_path = app_config.legacy_conf_path / config.config_path
+        config_path = legacy_config_path.as_posix()
+        with open(config_path, "r") as stream:
+            try:
+                flux_conf = yaml.safe_load(stream)
+            except:
+                raise
+
+        match submodel_type:
+            case SubModelType.Transformer:
+                return self._load_from_singlefile(config, flux_conf)
+
+        raise Exception("Only Checkpoint Flux models are currently supported.")
+
+    def _load_from_singlefile(
+        self,
+        config: AnyModelConfig,
+        flux_conf: Any,
+    ) -> AnyModel:
+        assert isinstance(config, MainBnbQuantized4bCheckpointConfig)
+        load_class = Flux
+        params = None
+        model_path = Path(config.path)
+        dataclass_fields = {f.name for f in fields(FluxParams)}
+        filtered_data = {k: v for k, v in flux_conf["params"].items() if k in dataclass_fields}
+        params = FluxParams(**filtered_data)
+
+        with SilenceWarnings():
+            with accelerate.init_empty_weights():
+                model = load_class(params)
+                model = quantize_model_nf4(model, modules_to_not_convert=set(), compute_dtype=torch.bfloat16)
+            # TODO(ryand): Right now, some of the weights are loaded in bfloat16. Think about how best to handle
+            # this on GPUs without bfloat16 support.
+            sd = load_file(model_path)
             model.load_state_dict(sd, strict=False, assign=True)
         return model