code: def _get_layer_degree_signal(degree_of_layer, bias_val, decay):
      """A signal based on the degree of a layer."""
      return np.exp(-decay * abs(degree_of_layer - bias_val))
  
file_path: dragonfly/dragonfly/nn/syn_nn_functions.py
imports: import numpy
label_desc: Use image node_id 5 for calling a global function with example usage: _get_layer_degree_signal(degree_of_layer, bias_val, decay) and returns: np