code: def patch_sum(vertices, odf, pole, width):
      eqvert = patch_vertices(vertices, pole, width)
      # need to test for whether eqvert is empty or not
      if len(eqvert) == 0:
          print(
              "empty cone around pole %s with with width %f"
              % (np.array_str(pole), width)
          )
          return np.Null
      return np.sum([odf[i] for i in eqvert])
  
imports: import numpy
  from dipy.reconst.odf import OdfModel, OdfFit
  from dipy.reconst.cache import Cache
  import warnings
  from dipy.reconst.multi_voxel import multi_voxel_fit
label_desc: Use image node_id 11 for calling a global function with example usage: patch_sum(vertices, odf, pole, width) and returns: np, np