docstr: ...Test sgd astype method
          
docstr_tok: ["...","Test","sgd","astype","method"]
code: def test_sgd_dtype_can_change(self):
      """...Test sgd astype method"""
  
      def create_solver():
          return SGD(
              max_iter=100,
              verbose=False,
              step=1e-1,
              seed=TestSolver.sto_seed,
          )
  
      self._test_solver_astype_consistency(create_solver)
  
file_path: tick/tick/solver/tests/sgd_test.py
imports: import unittest
  from tick.solver import SGD
  from tick.solver.tests import TestSolver
label_desc: Use image node_id 3 for calling the SGDTest obj's underlying member method code with example usage: obj.test_sgd_dtype_can_change() and returns: SGD