class_docstr: Decay the LR based on the inverse square root of the update number.
  
  Example:
  
      .. code-block:: python
  
          start_value: 4.8
          warmup_interval_length: 0.1
  Corresponds to a inverse sqrt decay schedule with values in [4.8, 0]
code: def __call__(self, where: float):
      if where > 0.0:
          return self.decay_factor * (where**-0.5)
      else:
          return self.decay_factor
  
imports: from typing import Any, Dict
  from classy_vision.optim.param_scheduler import ClassyParamScheduler, register_param_scheduler, UpdateInterval
label_desc: Use image node_id 3 for calling the InverseSqrtScheduler obj's underlying member method code with example usage: obj.__call__(where) and returns: unknown, self