code: def fit(
      self,
      series: Union[TimeSeries, Sequence[TimeSeries]],
      past_covariates: Optional[
          Union[TimeSeries, Sequence[TimeSeries]]
      ] = None,
      future_covariates: Optional[
          Union[TimeSeries, Sequence[TimeSeries]]
      ] = None,
      max_samples_per_ts: Optional[int] = None,
      n_jobs_multioutput_wrapper: Optional[int] = None,
      **kwargs,
  ):
      self._validate_categorical_covariates(
          series=series,
          past_covariates=past_covariates,
          future_covariates=future_covariates,
      )
      super().fit(
          series=series,
          past_covariates=past_covariates,
          future_covariates=future_covariates,
          max_samples_per_ts=max_samples_per_ts,
          n_jobs_multioutput_wrapper=n_jobs_multioutput_wrapper,
          **kwargs,
      )
  
imports: from collections import OrderedDict
  from typing import Any, Callable, Dict, List, Optional, Sequence, Tuple, Union
  import numpy
  import pandas
  from sklearn.linear_model import LinearRegression
  from darts.logging import get_logger, raise_if, raise_if_not, raise_log
  from darts.models.forecasting.forecasting_model import GlobalForecastingModel
  from darts.timeseries import TimeSeries
  from darts.utils.data.tabularization import add_static_covariates_to_lagged_data, create_lagged_component_names, create_lagged_training_data
  from darts.utils.historical_forecasts import _check_optimizable_historical_forecasts_global_models, _optimized_historical_forecasts_all_points, _optimized_historical_forecasts_last_points_only, _process_historical_forecast_input
  from darts.utils.multioutput import MultiOutputRegressor
  from darts.utils.utils import _check_quantiles, get_single_series, seq2series, series2seq
label_desc: Use image node_id 2 for calling the RegressionModelWithCategoricalCovariates obj's underlying member method code with example usage: obj.fit(series, past_covariates, future_covariates, max_samples_per_ts, n_jobs_multioutput_wrapper) without return types