code: def create_sym_log_bar_chart(self, x_labels, y_values, y_label):
          
          ax1 = self.create_bar_chart(x_labels, y_values, y_label)
          ax1.set_yscale("sym-log", linthreshy=1e-12)  # logarithmic plot
          return ax1
docs: Creates bar chart (log version)
  
          :param x_labels: Names for each variable
          :param y_values: Values of x labels
          :param y_label: Label of y axis
          :return: Sym-log bar chart