code: def _update_estimator_univariate(node, target, w):
      node.estimator.update(target, w)
  
file_path: river/river/tree/splitter/ebst_splitter.py
imports: from __future__ import annotations
  import functools
  from river.stats import Var
  from ..utils import BranchFactory
  from .base import Splitter
label_desc: Use image node_id 2 for calling the EBSTNode obj's underlying member method code with example usage: obj._update_estimator_univariate(node, target, w) without return types