code: def _assert_deterministic(series: TimeSeries):
      raise_if_not(
          series.is_deterministic,
          "When used with method wls_var or mint_cov, the MinT reconciliator "
          + "has to be fit on a deterministic series "
          + "containing residuals. This series is stochastic.",
      )
  
imports: from typing import Any, Mapping, Optional
  import numpy
  from darts.dataprocessing.transformers import BaseDataTransformer, FittableDataTransformer
  from darts.timeseries import TimeSeries
  from darts.utils.utils import raise_if_not
label_desc: Use image node_id 4 for calling the MinTReconciliator obj's underlying member method code with example usage: obj._assert_deterministic(series) without return types