class_docstr: Base of VarLenTensorGeneratorBase that generates tf.sparse.SparseTensor.
code: def _get_shape(self):
      return [
          dim if dim is not None else self._get_dim()
          for dim in self.spec.shape.as_list()
      ]
  
imports: import enum
  import hashlib
  import numpy
  import tensorflow
  from tests.test_atds_avro.utils.generator.generator_base import Generator
  from tests.test_atds_avro.utils.hash_util import int_to_bytes
label_desc: Use image node_id 3 for calling the VarLenTensorGeneratorBase obj's underlying member method code with example usage: obj._get_shape() and returns: unknown