add(handler) add custom input handler

input_handler.py

@@ -0,0 +1,45 @@
+from typing import Dict, List, Any
+import torch
+from torch import autocast
+from diffusers import AutoPipelineForText2Image
+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
+        import torch
+
+        self.pipe = AutoPipelineForText2Image.from_pretrained("stabilityai/sdxl-turbo", torch_dtype=torch.float16, variant="fp16")
+        self.pipe.load_lora_weights(path, weight_name="pytorch_lora_weights.safetensors")
+
+        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, num_inference_steps=1, guidance_scale=0.0).images[0]
+
+        # encode image as base 64
+        buffered = BytesIO()
+        image.save(buffered, format="JPEG")
+        img_str = base64.b64encode(buffered.getvalue())
+
+        # postprocess the prediction
+        return {"image": img_str.decode()}