code: def min_train_series_length(self) -> int:
      if (
          self.seasonal_periods is not None
          and self.seasonal_periods > 1
      ):
          return 2 * self.seasonal_periods
      return 3
  
file_path: darts/darts/models/forecasting/exponential_smoothing.py
imports: from typing import Any, Dict, Optional
  import numpy
  import statsmodels.tsa.holtwinters
  from darts.logging import get_logger
  from darts.models.forecasting.forecasting_model import LocalForecastingModel
  from darts.timeseries import TimeSeries
  from darts.utils.utils import ModelMode, SeasonalityMode
label_desc: Use image node_id 6 for calling the ExponentialSmoothing obj's underlying member method code with example usage: obj.min_train_series_length() and returns: int, unknown