code: def initialize(self, io_loop):
          ''' Start a Bokeh Server Tornado Application on a given Tornado IOLoop.
  
          '''
          self._loop = io_loop
  
          for app_context in self._applications.values():
              app_context._loop = self._loop
  
          self._clients = set()
  
          self._stats_job = PeriodicCallback(self._log_stats,
                                             self._stats_log_frequency_milliseconds)
  
          if self._mem_log_frequency_milliseconds > 0:
              self._mem_job = PeriodicCallback(self._log_mem,
                                               self._mem_log_frequency_milliseconds)
          else:
              self._mem_job = None
  
  
          self._cleanup_job = PeriodicCallback(self._cleanup_sessions,
                                               self._check_unused_sessions_milliseconds)
  
          if self._keep_alive_milliseconds > 0:
              self._ping_job = PeriodicCallback(self._keep_alive, self._keep_alive_milliseconds)
          else:
              self._ping_job = Nonf initialize(self, io_loop):
          ''' Start a Bokeh Server Tornado Application on a given Tornado IOLoop.
  
          '''
          self._loop = io_loop
  
          for app_context in self._applications.values():
              app_context._loop = self._loop
  
          self._clients = set()
  
          self._stats_job = PeriodicCallback(self._log_stats,
                                             self._stats_log_frequency_milliseconds)
  
          if self._mem_log_frequency_milliseconds > 0:
              self._mem_job = PeriodicCallback(self._log_mem,
                                               self._mem_log_frequency_milliseconds)
          else:
              self._mem_job = None
  
  
          self._cleanup_job = PeriodicCallback(self._cleanup_sessions,
                                               self._check_unused_sessions_milliseconds)
  
          if self._keep_alive_milliseconds > 0:
              self._ping_job = PeriodicCallback(self._keep_alive, self._keep_alive_milliseconds)
          else:
              self._ping_job = None
docs: Start a Bokeh Server Tornado Application on a given Tornado IOLoop.