code: def _prepend_str(col, val):
      return val + col.astype(str).fillna("null")
  
file_path: cugraph/python/cugraph/cugraph/structure/hypergraph.py
imports: import cudf
  import numpy
  from cugraph.structure.graph_classes import Graph
label_desc: Use image node_id 7 for calling a global function with example usage: _prepend_str(col, val) and returns: unknown