code: def _convert_can_etype_s_to_tup(canonical_etype_s):
      src_type, etype, dst_type = canonical_etype_s.split(",")
      src_type = src_type[2:-1]
      dst_type = dst_type[2:-2]
      etype = etype[2:-1]
      return (src_type, etype, dst_type)
  
file_path: cugraph/python/cugraph/cugraph/gnn/dgl_extensions/utils/sampling.py
imports: import cugraph
  import cudf
  import cupy
  import dask_cudf
label_desc: Use image node_id 5 for calling a global function with example usage: _convert_can_etype_s_to_tup(canonical_etype_s) and returns: src_type,  etype,  dst_type