class_docstr: Coupling Block following the NICE design.
code: def output_dims(self, input_dims):
      assert len(input_dims) == 1, "Can only use 1 input"
      return input_dims
  
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 4 for calling the NICECouplingBlock obj's underlying member method code with example usage: obj.output_dims(input_dims) and returns: input_dims