code: def shape(self) -> Shape:
      shape = self.Z.shape
      if not shape:
          return None
      return tuple(shape) + (1,)
  
imports: import abc
  from typing import Optional
  import tensorflow
  import tensorflow_probability
  from check_shapes import Shape, check_shapes
  from deprecated import deprecated
  from ..base import Module, Parameter, TensorData, TensorType
  from ..utilities import positive
label_desc: Use image node_id 3 for calling the InducingPointsBase obj's underlying member method code with example usage: obj.shape() and returns: unknown, None