(self, dataset, nodes)
Get all the instances belonging to a set of nodes for a given
        dataset.

        Parameters
        ----------
        dataset : Table
            A Orange Table dataset.
        nodes : iterable[node]
            A list of tree nodes for which we want the instances.

        Returns
        -------
Get all the instances belonging to a set of nodes for a given
        dataset.
Get all the instances belonging to a set of nodes for a given dataset .
def get_instances_in_nodes(self, dataset, nodes):
        """Get all the instances belonging to a set of nodes for a given
        dataset.

        Parameters
        ----------
        dataset : Table
            A Orange Table dataset.
        nodes : iterable[node]
            A list of tree nodes for which we want the instances.

        Returns
        -------

        """
def get_instances_in_nodes ( self , dataset , nodes ) :