code: def from_pretrained(cls, *args, **kwargs):
      requires_backends(cls, ["torch", "librosa"])
  
file_path: llmga/llmga/diffusers/src/diffusers/utils/dummy_torch_and_librosa_objects.py
imports: from ..utils import DummyObject, requires_backends
label_desc: Use image node_id 3 for calling the Mel obj's underlying member method code with example usage: obj.from_pretrained(cls) without return types