code: def _old_rfft(x: torch.Tensor):
      return torch.rfft(x, 1)
  
file_path: julius/julius/fftconv.py
imports: from typing import Optional
  import torch
  from torch.nn import functional
  from .core import pad_to, unfold
  from .utils import simple_repr
label_desc: Use image node_id 2 for calling a global function with example usage: _old_rfft(x) and returns: torch