code: def _get_component_mask(kwargs, dropna):
      component_mask = kwargs.get("component_mask", None)
      raise_if(
          dropna and (component_mask is not None),
          (
              "Cannot specify `component_mask` with `dropna = True`, "
              "since differenced and undifferenced components will be "
              "of different lengths."
          ),
          logger,
      )
      return component_mask
  
file_path: darts/darts/dataprocessing/transformers/diff.py
imports: from typing import Any, Mapping, Sequence, Union
  import numpy
  from darts.logging import get_logger, raise_if, raise_if_not
  from darts.timeseries import TimeSeries
  from .fittable_data_transformer import FittableDataTransformer
  from .invertible_data_transformer import InvertibleDataTransformer
label_desc: Use image node_id 5 for calling the Diff obj's underlying member method code with example usage: obj._get_component_mask(kwargs, dropna) and returns: component_mask