code: def initialize(self):
          
          self.randomize()
          self.dweight = Numeric.zeros((self.fromLayer.size, \
                                        self.toLayer.size), 'f')
          self.wed = Numeric.zeros((self.fromLayer.size, \
                                    self.toLayer.size), 'f')
          self.wedLast = Numeric.zeros((self.fromLayer.size, \
                                        self.toLayer.size), 'f')
docs: Initializes self.dweight and self.wed to zero matrices.