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handler.py

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+import os
+from typing import Any, Dict
+
+from diffusers import FluxPipeline, FluxTransformer2DModel
+from torchao.quantization import int8_weight_only, quantize_
+from PIL.Image import Image
+import torch
+
+from huggingface_inference_toolkit.logging import logger
+
+class EndpointHandler:
+    def __init__(self, **kwargs: Any) -> None:  # type: ignore
+        repo_id = "camenduru/FLUX.1-dev-diffusers"
+        dtype = torch.bfloat16
+        transformer = FluxTransformer2DModel.from_pretrained(repo_id, subfolder="transformer", torch_dtype=dtype)
+        quantize_(transformer, int8_weight_only(), device="cuda")
+        transformer.to(memory_format=torch.channels_last)
+        transformer = torch.compile(transformer, mode="max-autotune", fullgraph=True)
+        self.pipeline = FluxPipeline.from_pretrained(repo_id, transformer=transformer, torch_dtype=torch.bfloat16).to("cuda")
+        self.pipeline.vae.to(memory_format=torch.channels_last)
+        self.pipeline.vae.decode = torch.compile(self.pipeline.vae.decode, mode="max-autotune", fullgraph=True)
+
+    def __call__(self, data: Dict[str, Any]) -> Image:
+        logger.info(f"Received incoming request with {data=}")
+
+        if "inputs" in data and isinstance(data["inputs"], str):
+            prompt = data.pop("inputs")
+        elif "prompt" in data and isinstance(data["prompt"], str):
+            prompt = data.pop("prompt")
+        else:
+            raise ValueError(
+                "Provided input body must contain either the key `inputs` or `prompt` with the"
+                " prompt to use for the image generation, and it needs to be a non-empty string."
+            )
+
+        parameters = data.pop("parameters", {})
+
+        num_inference_steps = parameters.get("num_inference_steps", 30)
+        width = parameters.get("width", 1024)
+        height = parameters.get("height", 768)
+        guidance_scale = parameters.get("guidance_scale", 3.5)
+
+        # seed generator (seed cannot be provided as is but via a generator)
+        seed = parameters.get("seed", 0)
+        generator = torch.manual_seed(seed)
+
+        return self.pipeline(  # type: ignore
+            prompt,
+            height=height,
+            width=width,
+            guidance_scale=guidance_scale,
+            num_inference_steps=num_inference_steps,
+            generator=generator,
+        ).images[0]

requirements.txt

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+torch
+diffusers
+peft
+accelerate
+transformers
+numpy
+Pillow