code: def allocate(self, shared_outputs=None):
      self.outputs = self.be.empty((self.num_boxes, 4))
  
imports: from neon.layers.layer import Layer, ParameterLayer
  import numpy
  from neon.transforms import Softmax
  from neon.initializers.initializer import Constant
  import math
  from collections import OrderedDict
label_desc: Use image node_id 3 for calling the PriorBox obj's underlying member method code with example usage: obj.allocate(shared_outputs) without return types