code: def _update_impl(self, key, p, g):
      _update_nesterov(p, g, self.v[key], self.lr, self.momentum)
  
file_path: nnabla/python/test/solver/test_nesterov.py
imports: import pytest
  import nnabla.solvers
  import numpy
  from solver_test_utils import solver_tester, RefSolver
  from nbla_test_utils import list_context
label_desc: Use image node_id 3 for calling the RefNesterov obj's underlying member method code with example usage: obj._update_impl(key, p, g) without return types