code: def _binary_sign(t):
      return (t >= 0).to(t) * 2.0 - 1.0
  
imports: import warnings
  from typing import NamedTuple, Optional
  import torch
  import torch.nn.functional
  from pytorch3d.ops import points_alignment, utils
label_desc: Use image node_id 11 for calling a global function with example usage: _binary_sign(t) and returns: unknown