code: def calculate_binary(
      self, left: pd.Series, right: pd.Series
  ) -> pd.Series:
      def _f(x):
          value_counts = x.value_counts(normalize=True)
          return self._loc(x, value_counts)
  
      freq = left.groupby(right).apply(_f)
      return pd.Series(freq, index=right.index)
  
imports: from upgini.autofe.operand import PandasOperand, VectorizableMixin
  from typing import Optional
  import pandas
label_desc: Use image node_id 1 for calling the GroupByThenFreq obj's underlying member method code with example usage: obj.calculate_binary(left, right) and returns: pd, self