class_docstr: Temporary shim to support both `opt.variables()` and `opt.variables`.
class_docstr_tok: ["Temporary","shim","to","support","both","`","opt.variables","(",")","`","and","`","opt.variables","`","."]
code: def __call__(self):
      return self
  
file_path: horovod/horovod/_keras/__init__.py
imports: import os
  from packaging import version
  import horovod.tensorflow
  import tensorflow
  from horovod.tensorflow.gradient_aggregation import LocalGradientAggregationHelper
  from horovod.tensorflow.gradient_aggregation_eager import LocalGradientAggregationHelperEager
  from horovod.tensorflow.mpi_ops import rank, size_op
label_desc: Use image node_id 1 for calling the CallableList obj's underlying member method code with example usage: obj.__call__() and returns: self