class_docstr: Optimizer that implements COCOB Backprop Algorithm
  
      Reference:
          - [COntinuos COin Betting (COCOB) Backprop optimizer
  ](https://arxiv.org/abs/1705.07795)
code: def _resource_apply_sparse(
      self, grad, handle, indices, apply_state=None
  ):
      raise NotImplementedError()
  
file_path: addons/tensorflow_addons/optimizers/cocob.py
imports: from typeguard import typechecked
  import tensorflow
  from tensorflow_addons.optimizers import KerasLegacyOptimizer
label_desc: Use image node_id 4 for calling the COCOB obj's underlying member method code with example usage: obj._resource_apply_sparse(grad, handle, indices, apply_state) without return types