code: def test_plus_equals(self):
      a = Tensor.randn(10, 10)
      b = Tensor.randn(10, 10)
      c = a + b
      val1 = c.numpy()
      a += b
      val2 = a.numpy()
      np.testing.assert_allclose(val1, val2)
  
imports: import numpy
  import torch
  import unittest, copy
  import mmap
  from tinygrad import Tensor, Device, dtypes
  from tinygrad.helpers import temp
  from extra.gradcheck import numerical_jacobian, jacobian, gradcheck
label_desc: Use image node_id 2 for calling the TestTinygrad obj's underlying member method code with example usage: obj.test_plus_equals() without return types