How to use the ipykernel.pylab.config.InlineBackend.instance function in ipykernel

c.InlineBackend.figure_formats = {'png', 'jpeg'}
        c.InlineBackend.print_figure_kwargs.update({'quality' : 90})

    Parameters
    ----------
    *formats : strs
        One or more figure formats to enable: 'png', 'retina', 'jpeg', 'svg', 'pdf'.
    **kwargs :
        Keyword args will be relayed to ``figure.canvas.print_figure``.
    """
    from IPython.core.interactiveshell import InteractiveShell
    from IPython.core.pylabtools import select_figure_formats
    # build kwargs, starting with InlineBackend config
    kw = {}
    from ipykernel.pylab.config import InlineBackend
    cfg = InlineBackend.instance()
    kw.update(cfg.print_figure_kwargs)
    kw.update(**kwargs)
    shell = InteractiveShell.instance()
    select_figure_formats(shell, formats, **kw)

by::

        In [1]: set_matplotlib_close(False)

    To set this in your config files use the following::

        c.InlineBackend.close_figures = False

    Parameters
    ----------
    close : bool
        Should all matplotlib figures be automatically closed after each cell is
        run?
    """
    from ipykernel.pylab.config import InlineBackend
    cfg = InlineBackend.instance()
    cfg.close_figures = close

def show(close=None, block=None):
    """Show all figures as SVG/PNG payloads sent to the IPython clients.

    Parameters
    ----------
    close : bool, optional
      If true, a ``plt.close('all')`` call is automatically issued after
      sending all the figures. If this is set, the figures will entirely
      removed from the internal list of figures.
    block : Not used.
      The `block` parameter is a Matplotlib experimental parameter.
      We accept it in the function signature for compatibility with other
      backends.
    """
    if close is None:
        close = InlineBackend.instance().close_figures
    try:
        for figure_manager in Gcf.get_all_fig_managers():
            display(
                figure_manager.canvas.figure,
                metadata=_fetch_figure_metadata(figure_manager.canvas.figure)
            )
    finally:
        show._to_draw = []
        # only call close('all') if any to close
        # close triggers gc.collect, which can be slow
        if close and Gcf.get_all_fig_managers():
            matplotlib.pyplot.close('all')

def flush_figures():
    """Send all figures that changed

    This is meant to be called automatically and will call show() if, during
    prior code execution, there had been any calls to draw_if_interactive.

    This function is meant to be used as a post_execute callback in IPython,
    so user-caused errors are handled with showtraceback() instead of being
    allowed to raise.  If this function is not called from within IPython,
    then these exceptions will raise.
    """
    if not show._draw_called:
        return

    if InlineBackend.instance().close_figures:
        # ignore the tracking, just draw and close all figures
        try:
            return show(True)
        except Exception as e:
            # safely show traceback if in IPython, else raise
            ip = get_ipython()
            if ip is None:
                raise e
            else:
                ip.showtraceback()
                return
    try:
        # exclude any figures that were closed:
        active = set([fm.canvas.figure for fm in Gcf.get_all_fig_managers()])
        for fig in [ fig for fig in show._to_draw if fig in active ]:
            try:

by::
    
        In [1]: set_matplotlib_close(False)
    
    To set this in your config files use the following::
    
        c.InlineBackend.close_figures = False
    
    Parameters
    ----------
    close : bool
        Should all matplotlib figures be automatically closed after each cell is
        run?
    """
    from ipykernel.pylab.config import InlineBackend
    cfg = InlineBackend.instance()
    cfg.close_figures = close

c.InlineBackend.figure_formats = {'png', 'jpeg'}
        c.InlineBackend.print_figure_kwargs.update({'quality' : 90})

    Parameters
    ----------
    *formats : strs
        One or more figure formats to enable: 'png', 'retina', 'jpeg', 'svg', 'pdf'.
    **kwargs :
        Keyword args will be relayed to ``figure.canvas.print_figure``.
    """
    from IPython.core.interactiveshell import InteractiveShell
    from IPython.core.pylabtools import select_figure_formats
    # build kwargs, starting with InlineBackend config
    kw = {}
    from ipykernel.pylab.config import InlineBackend
    cfg = InlineBackend.instance()
    kw.update(cfg.print_figure_kwargs)
    kw.update(**kwargs)
    shell = InteractiveShell.instance()
    select_figure_formats(shell, formats, **kw)

by::
    
        In [1]: set_matplotlib_close(False)
    
    To set this in your config files use the following::
    
        c.InlineBackend.close_figures = False
    
    Parameters
    ----------
    close : bool
        Should all matplotlib figures be automatically closed after each cell is
        run?
    """
    from ipykernel.pylab.config import InlineBackend
    cfg = InlineBackend.instance()
    cfg.close_figures = close