let description = [{
This function computes the exponential of every element in the input tensor.
  i.e. `exp(x)` or `e^(x)`, where `x` is the input tensor.
  `e` denotes Euler's number and is approximately equal to 2.718281.
  Output is positive for any real input.

  ```python
  x = tf.constant(2.0)
  tf.math.exp(x) ==> 7.389056

  x = tf.constant([2.0, 8.0])