class_docstr: CompositePlot provides a baseclass for plots coordinate multiple
  subplots to form a Layout.
code: def _stream_update(self, **kwargs):
      contents = [k for s in self.streams for k in s.contents]
      key = tuple(
          None if d in contents else k
          for d, k in zip(self.dimensions, self.current_key)
      )
      key = wrap_tuple_streams(key, self.dimensions, self.streams)
      self._update_title(key)
  
imports: from contextlib import contextmanager
  from itertools import chain
  import matplotlib
  import numpy
  import param
  from matplotlib import animation, gridspec, pyplot, rcParams
  from matplotlib.font_manager import font_scalings
  from mpl_toolkits.mplot3d import Axes3D
  from ...core import AdjointLayout, Collator, CompositeOverlay, Element, Empty, GridMatrix, GridSpace, HoloMap, Layout, NdLayout
  from ...core.options import SkipRendering, Store
  from ...core.util import int_to_alpha, int_to_roman, wrap_tuple_streams
  from ..plot import DimensionedPlot, GenericAdjointLayoutPlot, GenericCompositePlot, GenericElementPlot, GenericLayoutPlot
  from ..util import attach_streams, collate, displayable
  from .util import compute_ratios, fix_aspect, get_old_rcparams
label_desc: Use image node_id 2 for calling the CompositePlot obj's underlying member method code with example usage: obj._stream_update() without return types