code: def __str__(self):
      return f"NaiveMovingAverage({self.input_chunk_length})"
  
imports: from typing import List, Optional, Sequence, Union
  import numpy
  from darts.logging import get_logger, raise_if, raise_if_not
  from darts.models.forecasting.ensemble_model import EnsembleModel
  from darts.models.forecasting.forecasting_model import ForecastingModel, LocalForecastingModel
  from darts.timeseries import TimeSeries
label_desc: Use image node_id 4 for calling the NaiveMovingAverage obj's underlying member method code with example usage: obj.__str__() and returns: str, self, str