class_docstr: Coupling Block following the NICE design.
code: def jacobian(self, x, rev=False):
      return 0
  
imports: import math
  import torch
  from torch import nn
  from transformers.activations import get_activation
  from ..configuration import AdapterFusionConfig, BnConfig
  from ..context import ForwardContext
label_desc: Use image node_id 3 for calling the NICECouplingBlock obj's underlying member method code with example usage: obj.jacobian(x, rev) and returns: int