code: def get(identifier):
      """get the activation function"""
      if identifier is None:
          return linear
      if callable(identifier):
          return identifier
      if isinstance(identifier, str):
          activations = {
              "relu": relu,
              "sigmoid": sigmoid,
              "tanh": tanh,
              "linear": linear,
              "softmax": softmax,
          }
          return activations[identifier]
  
file_path: tf-encrypted/tf_encrypted/keras/activations.py
imports: import tf_encrypted
label_desc: Use image node_id 9 for calling a global function with example usage: get(identifier) and returns: linear, identifier, activations