Create handler.py

handler.py

@@ -0,0 +1,44 @@
+from typing import Dict, Any
+import logging
+
+from transformers import AutoModelForCausalLM, AutoTokenizer
+from peft import PeftConfig, PeftModel
+import torch.cuda
+
+
+LOGGER = logging.getLogger(__name__)
+logging.basicConfig(level=logging.INFO)
+device = "cuda" if torch.cuda.is_available() else "cpu"
+
+
+class EndpointHandler():
+    def __init__(self, path=""):
+        config = PeftConfig.from_pretrained(path)
+        model = AutoModelForCausalLM.from_pretrained(config.base_model_name_or_path, load_in_8bit=True, device_map='auto')
+        self.tokenizer = AutoTokenizer.from_pretrained(config.base_model_name_or_path)
+        # Load the Lora model
+        self.model = PeftModel.from_pretrained(model, path)
+
+    def __call__(self, data: Dict[str, Any]) -> Dict[str, Any]:
+        """
+        Args:
+            data (Dict): The payload with the text prompt and generation parameters.
+        """
+        LOGGER.info(f"Received data: {data}")
+        # Get inputs
+        prompt = data.pop("inputs", None)
+        parameters = data.pop("parameters", None)
+        if prompt is None:
+            raise ValueError("Missing prompt.")
+        # Preprocess
+        input_ids = self.tokenizer(prompt, return_tensors="pt").input_ids.to(device)
+        # Forward
+        LOGGER.info(f"Start generation.")
+        if parameters is not None:
+            output = self.model.generate(input_ids=input_ids, **parameters)
+        else:
+            output = self.model.generate(input_ids=input_ids)
+        # Postprocess
+        prediction = self.tokenizer.decode(output[0])
+        LOGGER.info(f"Generated text: {prediction}")
+        return {"generated_text": prediction}