code: def save_polydata(
      polydata, file_name, binary=False, color_array_name=None
  ):
      """Save a vtk polydata to a supported format file.
  
      Save formats can be VTK, VTP, FIB, PLY, STL and XML.
  
      Parameters
      ----------
      polydata : vtkPolyData
      file_name : string
  
      """
      fury.io.save_polydata(
          polydata=polydata,
          file_name=file_name,
          binary=binary,
          color_array_name=color_array_name,
      )
  
imports: import numpy
  from dipy.tracking.streamline import transform_streamlines
  from dipy.utils.optpkg import optional_package
label_desc: Use image node_id 2 for calling a global function with example usage: save_polydata(polydata, file_name, binary, color_array_name) without return types