handler.py

from typing import Any, Dict

import torch
from transformers import AutoProcessor, MusicgenForConditionalGeneration


class EndpointHandler:
    def __init__(self, path=""):
        # load model and processor from path
        self.processor = AutoProcessor.from_pretrained(path)
        self.model = MusicgenForConditionalGeneration.from_pretrained(
            path, torch_dtype=torch.float16
        ).to("cuda")

    def __call__(self, data: Dict[str, Any]) -> Dict[str, str]:
        """
        Args:
            data (:dict:):
                The payload with the text prompt and generation parameters.
        """
        # process input
        inputs = data.pop("inputs", data)
        parameters = data.pop("parameters", None)

        # preprocess
        inputs = self.processor(
            text=[inputs],
            padding=True,
            return_tensors="pt",
        ).to("cuda")

        # pass inputs with all kwargs in data
        if parameters is not None:
            with torch.autocast("cuda"):
                outputs = self.model.generate(**inputs, **parameters)
        else:
            with torch.autocast("cuda"):
                outputs = self.model.generate(
                    **inputs,
                )

        # postprocess the prediction
        prediction = outputs[0].cpu().numpy().tolist()

        return {"generated_audio": prediction}