code: def pair(t):
      return t if isinstance(t, tuple) else (t, t)
  
imports: import torch
  import torch.nn.functional
  from torch.nn.utils.rnn import pad_sequence
  from torch import nn, einsum
  from einops import rearrange, repeat
  from einops.layers.torch import Rearrange
label_desc: Use image node_id 2 for calling a global function with example usage: pair(t) and returns: unknown