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from transformers import AutoTokenizer, AutoModelForCausalLM
from peft import PeftModel
import torch

class EndpointHandler:
    def __init__(self, path=""):
        base_model = "unsloth/mistral-7b-instruct-v0.2-bnb-4bit"
        lora_path = path 
        self.tokenizer = AutoTokenizer.from_pretrained(base_model)
        model = AutoModelForCausalLM.from_pretrained(base_model, device_map="auto", torch_dtype=torch.float16)
        self.model = PeftModel.from_pretrained(model, lora_path)
        self.model.eval()

    def __call__(self, data):
        inputs = data.get("inputs", data)
        if isinstance(inputs, list):
            prompt = inputs[0]
        else:
            prompt = inputs
        inputs = self.tokenizer(prompt, return_tensors="pt").to(self.model.device)
        with torch.no_grad():
            outputs = self.model.generate(**inputs, max_new_tokens=300)
        out = self.tokenizer.decode(outputs[0], skip_special_tokens=True)
        return [{"generated_text": out}]