code: def __init__(self, pos=(0, 0), vel=(0, 0), noise_std=1.0):
      self.vel = vel
      self.noise_std = noise_std
      self.pos = [pos[0], pos[1]]
  
imports: from __future__ import absolute_import, division, print_function
  import numpy.random
  from numpy.random import randn
  import numpy
  import matplotlib.pyplot
  from pytest import approx
  from filterpy.kalman import KalmanFilter, update, predict, batch_filter
  from filterpy.common import Q_discrete_white_noise, kinematic_kf, Saver
  from filterpy.stats import mahalanobis
  from scipy.linalg import block_diag, norm
label_desc: Use image node_id 1 to create a new PosSensor1 object from inherited base classes: object with example: obj = PosSensor1(pos, vel, noise_std)