class_docstr: A base class containing for the 2D browser.
  
  This class contains all backend-independent attributes and methods.
class_docstr_tok: ["A","base","class","containing","for","the","2D","browser",".","This","class","contains","all","backend-independent","attributes","and","methods","."]
code: def _get_start_stop(self):
      # update time
      start_sec = self.mne.t_start - self.mne.first_time
      stop_sec = start_sec + self.mne.duration
      if self.mne.is_epochs:
          start, stop = np.round(
              np.array([start_sec, stop_sec]) * self.mne.info["sfreq"]
          ).astype(int)
      else:
          start, stop = self.mne.inst.time_as_index(
              (start_sec, stop_sec)
          )
  
      return start, stop
  
imports: import importlib
  from abc import ABC, abstractmethod
  from collections import OrderedDict
  from contextlib import contextmanager
  from copy import deepcopy
  from itertools import cycle
  import numpy
  from .._fiff.pick import _DATA_CH_TYPES_SPLIT
  from ..defaults import _handle_default
  from ..filter import _iir_filter, _overlap_add_filter
  from ..fixes import _compare_version
  from ..utils import _check_option, _get_stim_channel, _validate_type, get_config, logger, set_config, verbose
  from .backends._utils import VALID_BROWSE_BACKENDS
  from .utils import _get_color_list, _setup_plot_projector, _show_browser
label_desc: Use image node_id 11 for calling the BrowserBase obj's underlying member method code with example usage: obj._get_start_stop() and returns: start,  stop