code: def _infer_x_for_line(y):
      """
      Infers the x for a line if no x is provided.
      """
      array_shape = shape(y)
  
      if len(array_shape) == 0:
          return []
      if len(array_shape) == 1:
          return arange(array_shape[0])
      if len(array_shape) > 1:
          return arange(array_shape[1])
  
imports: import sys
  from collections import OrderedDict
  from IPython.display import display
  from ipywidgets import Image
  from numpy import arange, issubdtype, array, column_stack, shape
  from .figure import Figure
  from bqscales import Scale, LinearScale, Mercator
  from .axes import Axis
  from .marks import Lines, Scatter, Hist, Bars, OHLC, Pie, Map, Image, Label, HeatMap, GridHeatMap, topo_load, Boxplot, Bins
  from .interacts import BrushIntervalSelector, FastIntervalSelector, BrushSelector, IndexSelector, MultiSelector, LassoSelector
  from traitlets.utils.sentinel import Sentinel
  import functools
label_desc: Use image node_id 22 for calling a global function with example usage: _infer_x_for_line(y) and returns: list, arange, arange