code: def _check_browser_backend_name(backend_name):
      _validate_type(backend_name, str, "backend_name")
      backend_name = backend_name.lower()
      backend_name = (
          "qt" if backend_name == "pyqtgraph" else backend_name
      )
      _check_option("backend_name", backend_name, VALID_BROWSE_BACKENDS)
      return backend_name
  
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 3 for calling a global function with example usage: _check_browser_backend_name(backend_name) and returns: backend_name