private static double getBiasL2RegularizationFromConfig(Map<String, Object> layerConfig,
                                                            boolean enforceTrainingConfig,
                                                            KerasLayerConfiguration conf)
            throws UnsupportedKerasConfigurationException, InvalidKerasConfigurationException {
        Map<String, Object> innerConfig = KerasLayerUtils.getInnerLayerConfigFromConfig(layerConfig, conf);