code: def Negate():
      """Returns a layer that computes the element-wise negation of a tensor."""
      return Fn("Negate", lambda x: -x)
  
imports: from absl import logging
  import numpy
  import tensorflow
  from trax import fastmath
  from trax.fastmath import numpy
  from trax.layers import base
  from trax.layers import initializers
  from trax.layers.assert_shape import assert_shape
  from trax.layers.base import Fn
label_desc: Use image node_id 13 for calling a global function with example usage: Negate() and returns: Fn