class_docstr: A basic feature store to manage multiple features for access.
class_docstr_tok: ["A","basic","feature","store","to","manage","multiple","features","for","access","."]
docstr: Return the number of features.
docstr_tok: ["Return","the","number","of","features","."]
code: def __len__(self):
      """Return the number of features."""
      return len(self._features)
  
file_path: dgl/python/dgl/graphbolt/impl/basic_feature_store.py
imports: from typing import Dict, Tuple
  import torch
  from ..feature_store import Feature, FeatureStore
label_desc: Use image node_id 6 for calling the BasicFeatureStore obj's underlying member method code with example usage: obj.__len__() and returns: len