code: def add_gaussian_noise(
      X: Tensor, mean: float = 0.0, stddev: float = 1.0
  ) -> Tensor:
      """Add Gaussian noise to tensor `X`."""
      return X + kbackend.random_normal(
          shape=tf.shape(X), mean=mean, stddev=stddev, dtype=X.dtype
      )
  
imports: from __future__ import annotations
  from typing import TypeVar
  import numpy
  import tensorflow
  import tensorflow.keras.backend
  from innvestigate.backend.types import Layer, OptionalList, ShapeTuple, Tensor
label_desc: Use image node_id 11 for calling a global function with example usage: add_gaussian_noise(X, mean, stddev) and returns: unknown