class_docstr: Training with exponentially growing learning rate
class_docstr_tok: ["Training","with","exponentially","growing","learning","rate"]
code: def before_batch(self):
      self._update_val(self.train_iter / self.num_it)
  
imports: from __future__ import annotations
  from ..basics import *
  from .tracker import SaveModelCallback
label_desc: Use image node_id 3 for calling the LRFinder obj's underlying member method code with example usage: obj.before_batch() without return types