code: def __str__(self):
      return f"<{self.__class__.__name__} node_size={self._num_node}, feature_bin_sizes={self._feature_bin_sizes}, node_data_size={self._node_data_size}, seed={self._global_seed}>"
  
imports: from ._histogram_distributed import DistributedHistogram
  from ._histogram_local import Histogram
label_desc: Use image node_id 2 for calling the HistogramBuilder obj's underlying member method code with example usage: obj.__str__() and returns: str, self, str, self, str, self, str, self, str, self, str