code: def force_index(close, volume, window=13, fillna=False):
      """Force Index (FI)
  
      It illustrates how strong the actual buying or selling pressure is. High
      positive values mean there is a strong rising trend, and low values signify
      a strong downward trend.
  
      http://stockcharts.com/school/doku.php?id=chart_school:technical_indicators:force_index
  
      Args:
          close(pandas.Series): dataset 'Close' column.
          volume(pandas.Series): dataset 'Volume' column.
          window(int): n period.
          fillna(bool): if True, fill nan values.
  
      Returns:
          pandas.Series: New feature generated.
      """
      return ForceIndexIndicator(
          close=close, volume=volume, window=window, fillna=fillna
      ).force_index()
  
imports: import typing
  import numpy
  import pandas
  from ta.utils import IndicatorMixin, _ema
label_desc: Use image node_id 4 for calling a global function with example usage: force_index(close, volume, window, fillna) and returns: ForceIndexIndicator