docstr: ...Test svrg astype method
          
docstr_tok: ["...","Test","svrg","astype","method"]
code: def test_svrg_dtype_can_change(self):
      """...Test svrg astype method"""
  
      def create_solver():
          return SVRG(
              tol=1e-13,
              step=0.1,
              max_iter=1000,
              seed=TestSolver.sto_seed,
              verbose=False,
          )
  
      self._test_solver_astype_consistency(create_solver)
  
imports: import unittest
  from warnings import catch_warnings, simplefilter
  from itertools import product
  import numpy
  from scipy.linalg.special_matrices import toeplitz
  from scipy.sparse import csr_matrix
  from tick.linear_model import ModelLinReg, ModelLogReg, SimuLogReg
  from tick.prox import ProxL1, ProxL1w, ProxTV, ProxEquality, ProxElasticNet
  from tick.solver import SVRG
  from tick.solver.tests import TestSolver
  from tick.solver.build.solver import SVRG_VarianceReductionMethod_Last
  from tick.solver.build.solver import SVRG_VarianceReductionMethod_Average
  from tick.solver.build.solver import SVRG_VarianceReductionMethod_Random
  from tick.solver.build.solver import SVRG_StepType_Fixed
  from tick.solver.build.solver import SVRG_StepType_BarzilaiBorwein
  from tick.simulation import weights_sparse_gauss
label_desc: Use image node_id 10 for calling the SVRGTest obj's underlying member method code with example usage: obj.test_svrg_dtype_can_change() and returns: SVRG