code: def selu(x, name):
      alpha = 1.6732632423543772848170429916717
      scale = 1.0507009873554804934193349852946
      return scale * tf.where(x >= 0.0, x, alpha * tf.nn.elu(x))
  
file_path: NiftyNet/niftynet/layer/activation.py
imports: from __future__ import absolute_import, print_function
  import tensorflow
  from niftynet.layer.base_layer import TrainableLayer
  from niftynet.utilities.util_common import look_up_operations
label_desc: Use image node_id 2 for calling a global function with example usage: selu(x, name) and returns: unknown