code: def _import_mpl():
      """This function is not needed outside this utils module."""
      try:
          import matplotlib.pyplot as plt
      except:
          raise ImportError("Matplotlib is not found.")
  
      return plt
  
imports: from statsmodels.compat.python import lrange
label_desc: Use image node_id 1 for calling a global function with example usage: _import_mpl() and returns: plt