How to use the cmdstanpy.utils.parse_var_dims function in cmdstanpy

def test_parse_missing(self):
        with self.assertRaises(ValueError):
            parse_var_dims(None)

def test_parse_empty(self):
        x = []
        vars_dict = parse_var_dims(x)
        self.assertEqual(len(vars_dict), 0)

x = [
            'foo',
            'phi.1.1',
            'phi.1.2',
            'phi.1.3',
            'phi.1.4',
            'phi.1.5',
            'phi.2.1',
            'phi.2.2',
            'phi.2.3',
            'phi.2.4',
            'phi.2.5',
            'bar.1',
            'bar.2',
        ]
        vars_dict = parse_var_dims(x)
        self.assertEqual(len(vars_dict), 3)
        self.assertEqual(vars_dict['foo'], 1)
        self.assertEqual(vars_dict['phi'], [2, 5])
        self.assertEqual(vars_dict['bar'], [2])

def test_parse_scalar(self):
        x = ['foo']
        vars_dict = parse_var_dims(x)
        self.assertEqual(len(vars_dict), 1)
        self.assertEqual(vars_dict['foo'], 1)

def test_parse_scalar_vec_scalar(self):
        x = [
            'foo',
            'phi.1',
            'phi.2',
            'phi.3',
            'phi.4',
            'phi.5',
            'phi.6',
            'phi.7',
            'phi.8',
            'phi.9',
            'phi.10',
            'bar',
        ]
        vars_dict = parse_var_dims(x)
        self.assertEqual(len(vars_dict), 3)
        self.assertEqual(vars_dict['foo'], 1)
        self.assertEqual(vars_dict['phi'], [10])
        self.assertEqual(vars_dict['bar'], 1)

def test_parse_scalars(self):
        x = ['foo', 'foo1']
        vars_dict = parse_var_dims(x)
        self.assertEqual(len(vars_dict), 2)
        self.assertEqual(vars_dict['foo'], 1)
        self.assertEqual(vars_dict['foo1'], 1)

self.runset.csv_files[i],
                                key,
                                dzero[key],
                                drest[key],
                            )
                        )
        self._draws_sampling = dzero['draws_sampling']
        if self._save_warmup:
            self._draws_warmup = dzero['draws_warmup']
        else:
            self._draws_warmup = 0
        self._column_names = dzero['column_names']
        if not self._is_fixed_param:
            self._num_params = dzero['num_params']
            self._metric_type = dzero.get('metric')
        self._stan_var_dims = parse_var_dims(dzero['column_names'])