code: def update_x_axis_index(self):
      global x_axis
      self.bokeh_source_orig.data[
          "index"
      ] = self.bokeh_source_orig.data[x_axis[0]]
      self.bokeh_source.data["index"] = self.bokeh_source.data[
          x_axis[0]
      ]
  
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 3 for calling the SignalsFileBase obj's underlying member method code with example usage: obj.update_x_axis_index() without return types