def count(
        self,
        domain: str,
        type_name: str,
        feature_name: str,
    ):
        """Get the count the specified feature in the feature store.

        Parameters
        ----------
        domain : str
            The domain of the feature such as "node", "edge" or "graph".
        type_name : str
            The node or edge type name.
        feature_name : str
            The feature name.
        Returns
        -------
        int
            The count of the specified feature in the feature store.
        """
        return self.__getitem__((domain, type_name, feature_name)).count()
Get the count the specified feature in the feature store.

        Parameters
        ----------
        domain : str
            The domain of the feature such as "node", "edge" or "graph".
        type_name : str
            The node or edge type name.
        feature_name : str
            The feature name.
        Returns
        -------
        int
            The count of the specified feature in the feature store.
        
python/dgl/graphbolt/feature_store.py