class_docstr: Always uses the same learning rate.
  
  Parameters
  ----------
  learning_rate
class_docstr_tok: ["Always","uses","the","same","learning","rate",".","Parameters","--","--","--","--","--","learning_rate"]
code: def _mutable_attributes(self):
      return {"learning_rate"}
  
file_path: river/river/optim/schedulers.py
imports: from __future__ import annotations
  import math
  from river import optim
label_desc: Use image node_id 2 for calling the Constant obj's underlying member method code with example usage: obj._mutable_attributes() and returns: unknown