code: def _fix_empty_tensors(boxes: Tensor) -> Tensor:
      """Empty tensors can cause problems in DDP mode, this methods corrects them."""
      if boxes.numel() == 0 and boxes.ndim == 1:
          return boxes.unsqueeze(0)
      return boxes
  
imports: from typing import Dict, Literal, Sequence, Tuple, Union
  from torch import Tensor
label_desc: Use image node_id 2 for calling a global function with example usage: _fix_empty_tensors(boxes) and returns: boxes, boxes