docstr: Number of sigma points for each variable in the state x
docstr_tok: ["Number","of","sigma","points","for","each","variable","in","the","state","x"]
code: def num_sigmas(self):
      """Number of sigma points for each variable in the state x"""
      return 2 * self.n + 1
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import matplotlib.pyplot
  import numpy.random
  from numpy.random import randn
  from numpy import asarray
  import numpy
  from filterpy.kalman import UnscentedKalmanFilter
  from filterpy.kalman import unscented_transform, MerweScaledSigmaPoints, JulierSigmaPoints, SimplexSigmaPoints
  from filterpy.common import Q_discrete_white_noise
  import filterpy.stats
  from math import cos, sin
  from filterpy.kalman import UnscentedKalmanFilter2
label_desc: Use image node_id 2 for calling the MerweScaledSigmaPoints2 obj's underlying member method code with example usage: obj.num_sigmas() and returns: unknown