docstr: ...Test adagrad astype method
          
docstr_tok: ["...","Test","adagrad","astype","method"]
code: def test_adagrad_dtype_can_change(self):
      """...Test adagrad astype method"""
  
      def create_solver():
          return AdaGrad(
              max_iter=100,
              verbose=False,
              step=0.1,
              seed=TestSolver.sto_seed,
          )
  
      self._test_solver_astype_consistency(create_solver)
  
file_path: tick/tick/solver/tests/adagrad_test.py
imports: import unittest
  from tick.solver import AdaGrad
  from tick.solver.tests import TestSolver
label_desc: Use image node_id 2 for calling the AdagradTest obj's underlying member method code with example usage: obj.test_adagrad_dtype_can_change() and returns: AdaGrad