code: def change_bollinger_bands_state(self, new_state):
      self.show_bollinger_bands = new_state
      for signal in self.signals.values():
          signal.change_bollinger_bands_state(new_state)
  
file_path: coach/rl_coach/dashboard_components/signals_file_base.py
imports: import numpy
  from bokeh.models import ColumnDataSource
  from rl_coach.dashboard_components.signals import Signal
  from rl_coach.dashboard_components.globals import x_axis, x_axis_options, show_spinner
label_desc: Use image node_id 11 for calling the SignalsFileBase obj's underlying member method code with example usage: obj.change_bollinger_bands_state(new_state) without return types