class_docstr: Structure representes neuron in the Neural Gas algorithm.
  
  Attributes
  ----------
  weight : 2d-array
      Neuron's position in the space.
  
  error : float
      Error accumulated during the training.
code: def __repr__(self):
      return "<{} error={}>".format(
          self.__class__.__name__, round(float(self.error), 6)
      )
  
imports: from operator import attrgetter
  import numpy
  from neupy.utils import format_data
  from neupy.exceptions import StopTraining
  from neupy.algorithms.base import BaseNetwork
  from neupy.core.properties import NumberProperty, ProperFractionProperty, IntProperty
label_desc: Use image node_id 2 for calling the NeuronNode obj's underlying member method code with example usage: obj.__repr__() and returns: str