code: def __init__(self, *args, **kwargs):
      super().__init__(*args, **kwargs)
      self._train_param_blobs = None
      self._train_param_blobs_frozen = False
  
file_path: pytorch/caffe2/python/layers/sampling_trainable_mixin.py
imports: import abc
label_desc: Use image node_id 1 to create a new SamplingTrainableMixin object  with example: obj = SamplingTrainableMixin()