class_docstr: A bivariate statistic measures a relationship between two variables.
docstr: Update and return the called instance.
docstr_tok: ["Update","and","return","the","called","instance","."]
code: def update(self, x, y):
      """Update and return the called instance."""
  
imports: from __future__ import annotations
  import abc
  import numbers
  from river import base
label_desc: Use image node_id 1 for calling the Bivariate obj's underlying member method code with example usage: obj.update(x, y) without return types