docstr: ...Test sdca astype method
          
docstr_tok: ["...","Test","sdca","astype","method"]
code: def test_sdca_dtype_can_change(self):
      """...Test sdca astype method"""
  
      def create_solver():
          return SDCA(
              l_l2sq=0.1,
              max_iter=100,
              verbose=False,
              seed=TestSolver.sto_seed,
          )
  
      self._test_solver_astype_consistency(create_solver)
  
imports: import unittest
  import numpy
  from tick.linear_model import ModelLogReg, ModelPoisReg, SimuPoisReg
  from tick.prox import ProxL1, ProxElasticNet, ProxZero, ProxL2Sq
  from tick.solver import SDCA, SVRG
  from tick.solver.tests import TestSolver
label_desc: Use image node_id 5 for calling the SDCATest obj's underlying member method code with example usage: obj.test_sdca_dtype_can_change() and returns: SDCA