code: def spmm_(op, src, edge_index, size, flow="target_to_source"):
      return globals()["spmm_" + op](src, edge_index, size, flow)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import tensorflow
label_desc: Use image node_id 3 for calling a global function with example usage: spmm_(op, src, edge_index, size, flow) and returns: globals