code: def testMSEMeter(self):
      a = torch.ones(7)
      b = torch.zeros(7)
  
      mtr = meter.MSEMeter()
      mtr.add(a, b)
      self.assertEqual(1.0, mtr.value())
  
file_path: pywick/tests/test_meters.py
imports: import unittest
  import math
  import torch
  import pywick.meters
  import numpy
label_desc: Use image node_id 4 for calling the TestMeters obj's underlying member method code with example usage: obj.testMSEMeter() without return types