code: def test_sgd(self):
      self._test_sgd(1, {"lr": 0.001}, 1e-6, 0)
  
imports: import numpy
  import torch
  import unittest
  from tinygrad import Tensor, Device
  from tinygrad.nn.optim import Adam, SGD, AdamW
  from tinygrad.helpers import CI
label_desc: Use image node_id 7 for calling the TestOptim obj's underlying member method code with example usage: obj.test_sgd() without return types