docs: public static Activation mapToActivation(String kerasActivation, KerasLayerConfiguration conf)
              throws UnsupportedKerasConfigurationException {
          Activation dl4jActivation;
          if (kerasActivation.equals(conf.getKERAS_ACTIVATION_SOFTMAX())) {
              dl4jActivation = Activation.SOFTMAX;
          } else if (kerasActivation.equals(conf.getKERAS_ACTIVATION_SOFTPLUS())) {
              dl4jActivation = Activation.SOFTPLUS;
          } else if (kerasActivation.equals(conf.getKERAS_ACTIVATION_SOFTSIGN())) {
              dl4jActivation = Activation.SOFTSIGN;
          } else if (kerasActivation.equals(conf.getKERAS_ACTIVATION_RELU())) {
              dl4jActivation = Activation.RELU;
          } else if (kerasActivation.equals(conf.getKERAS_ACTIVATION_RELU6())) {
              dl4jActivation = Activation.RELU6;
          } else if (kerasActivation.equals(conf.getKERAS_ACTIVATION_ELU())) {
              dl4jActivation = Activation.ELU;
          } else if (kerasActivation.equals(conf.getKERAS_ACTIVATION_SELU())) {
              dl4jActivation = Activation.SELU;
          } else if (kerasActivation.equals(conf.getKERAS_ACTIVATION_TANH())) {
              dl4jActivation = Activation.TANH;
          } else if (kerasActivation.equals(conf.getKERAS_ACTIVATION_SIGMOID())) {
              dl4jActivation = Activation.SIGMOID;
          } else if (kerasActivation.equals(conf.getKERAS_ACTIVATION_HARD_SIGMOID())) {
              dl4jActivation = Activation.HARDSIGMOID;
          } else if (kerasActivation.equals(conf.getKERAS_ACTIVATION_LINEAR())) {
              dl4jActivation = Activation.IDENTITY;
          } else {
              throw new UnsupportedKerasConfigurationException(
                      "Unknown Keras activation function " + kerasActivation);
          }
          return dl4jActivation;
      }