class_docstr: A store to manage multiple features for access.
docstr: Get the keys of the features.
  
  Returns
  -------
  List[tuple]
      The keys of the features. The tuples are in `(domain, type_name,
      feat_name)` format.
docstr_tok: ["Get","the","keys","of","the","features",".","Returns","--","--","--","-","List","[","tuple","]","The","keys","of","the","features",".","The","tuples","are","in","`","(","domain",",","type_name",",","feat_name",")","`","format","."]
code: def keys(self):
      """Get the keys of the features.
  
      Returns
      -------
      List[tuple]
          The keys of the features. The tuples are in `(domain, type_name,
          feat_name)` format.
      """
      raise NotImplementedError
  
file_path: dgl/python/dgl/graphbolt/feature_store.py
imports: import torch
label_desc: Use image node_id 6 for calling the FeatureStore obj's underlying member method code with example usage: obj.keys() without return types