code: def exists(val):
      return val is not None
  
imports: import math
  from functools import partial, wraps
  import torch
  import torch.nn
  from einops import repeat
  from torch.special import expm1
  from nemo.collections.multimodal.parts.utils import randn_like
label_desc: Use image node_id 1 for calling a global function with example usage: exists(val) and returns: unknown