code: public static IActivation getIActivationFromConfig(Map<String, Object> layerConfig, KerasLayerConfiguration conf)
              throws InvalidKerasConfigurationException, UnsupportedKerasConfigurationException {
          return getActivationFromConfig(layerConfig, conf).getActivationFunction();
      }
docs: Get activation function from Keras layer configuration.
  
  @param layerConfig dictionary containing Keras layer configuration
  @return DL4J activation function
  @throws InvalidKerasConfigurationException     Invalid Keras config
  @throws UnsupportedKerasConfigurationException Unsupported Keras config