class_docstr: Abstract class of solver.
class_docstr_tok: ["Abstract","class","of","solver","."]
docstr: Get the training operator.
docstr_tok: ["Get","the","training","operator","."]
code: def get_train_op(self):
      """Get the training operator."""
      raise NotImplementedError()
  
imports: import abc
  import math
  import delta.compat
  import tensorflow_addons
  from absl import logging
  from delta import utils
  from delta.utils import optimizer
  from delta.utils.register import registers
label_desc: Use image node_id 8 for calling the ABCSolver obj's underlying member method code with example usage: obj.get_train_op() without return types