Get error 'Can only serialize PIL.Image.Image, got <class 'dict'>'

[NaveenGTK]

Describe the bug

I am trying to use a model hosted on huggingface and I have created an inference endpoint for it. I have attached the code I used to access the endpoint and generate images. However, after the image is generated I get a base 64 string which when decoded translates to: 'Can only serialize PIL.Image.Image, got <class 'dict'>'

I get the following on the endpoint console as well:

INFO | POST / | Duration: 43398.34 ms 2024/04/25 23:29:01 ~ 2024-04-25 17:59:01,559 | ERROR | Can only serialize PIL.Image.Image, got <class 'dict'>

I'm new to hosting and using models so any help is appreciated. Model I'm trying to use is: https://huggingface.co/Linaqruf/animagine-xl

Reproduction

from typing import  Dict, List, Any
import torch
from torch import autocast
from diffusers import DiffusionPipeline, StableDiffusionXLPipeline
import base64
from io import BytesIO

set device
device = torch.device('cuda' if torch.cuda.is_available() else 'cpu')

if device.type != 'cuda':
    raise ValueError("need to run on GPU")

class EndpointHandler():
    def __init__(self, path=""):
        # load the optimized model
        self.pipe = DiffusionPipeline.from_pretrained(path, torch_dtype=torch.float16, use_safetensors=True)
        self.pipe = self.pipe.to(device)


    def __call__(self, data: Any) -> List[List[Dict[str, float]]]:
        """
        Args:
            data (:obj:):
                includes the input data and the parameters for the inference.
        Return:
            A :obj:`dict`:. base64 encoded image
        """
        inputs = data.pop("inputs", data)
        
        # run inference pipeline
        with autocast(device.type):
            image = self.pipe(inputs, guidance_scale=7.5).images[0]  
            
        # encode image as base 64
        buffered = BytesIO()
        image.save(buffered, format="JPEG")
        img_str = base64.b64encode(buffered.getvalue())
        print(img_str)

        # postprocess the prediction
        return {"image": img_str.decode()}

Logs

INFO | POST / | Duration: 43398.34 ms
2024/04/25 23:29:01 ~ 2024-04-25 17:59:01,559 | ERROR | Can only serialize PIL.Image.Image, got <class 'dict'>

System Info

Huggingface Inference Endpoint

Who can help?

No response