docstr: Refit the model if already fitted. 
code: def refit(self):
      """Refit the model if already fitted."""
      if self.fitted:
          self.fit()
  
imports: from __future__ import division, print_function
  import matplotlib
  from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg
  from matplotlib.backends.backend_tkagg import NavigationToolbar2TkAgg
  from matplotlib.figure import Figure
  from matplotlib.contour import ContourSet
  import Tkinter
  import sys
  import numpy
  from sklearn import svm
  from sklearn.datasets import dump_svmlight_file
  from sklearn.externals.six.moves import xrange
label_desc: Use image node_id 6 for calling the Controller obj's underlying member method code with example usage: obj.refit() without return types