code: def gather(input: torch.Tensor) -> Tuple[torch.Tensor]:
      """Gathers this tensor from all processes. Supports backprop."""
      return GatherLayer.apply(input)
  
file_path: lightly/lightly/utils/dist.py
imports: from typing import Optional, Tuple
  import torch
  import torch.distributed
label_desc: Use image node_id 3 for calling a global function with example usage: gather(input) and returns: GatherLayer