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Python | Tensorflow exp() method
• Last Updated : 10 Dec, 2018

Tensorflow is an open-source machine learning library developed by Google. One of its applications is to develop deep neural networks.

The module `tensorflow.math` provides support for many basic mathematical operations. Function `tf.exp()` [alias `tf.math.exp`] provides support for the exponential function in Tensorflow. It expects the input in form of complex numbers as or floating point numbers. The input type is tensor and if the input contains more than one element, an element-wise exponential value is computed, .

Syntax: tf.exp(x, name=None) or tf.math.exp(x, name=None)

Parameters:
x: A Tensor of type bfloat16, half, float32, float64, complex64 or complex128.
name (optional): The name for the operation.

Return type: A Tensor with the same size and type as that of x.

Code #1:

 `# Importing the Tensorflow library``import` `tensorflow as tf`` ` `# A constant vector of size 5``a ``=` `tf.constant([``-``0.5``, ``-``0.1``, ``0``, ``0.1``, ``0.5``], dtype ``=` `tf.float32)`` ` `# Applying the exp function and``# storing the result in 'b'``b ``=` `tf.exp(a, name ``=``'exp'``)`` ` `# Initiating a Tensorflow session``with tf.Session() as sess:``    ``print``(``'Input type:'``, a)``    ``print``(``'Input:'``, sess.run(a))``    ``print``(``'Return type:'``, b)``    ``print``(``'Output:'``, sess.run(b))`

Output:

```Input type: Tensor("Const:0", shape=(5, ), dtype=float32)
Input: [-0.5 -0.1  0.   0.1  0.5]
Return type: Tensor("exp:0", shape=(5, ), dtype=float32)
Output: [0.60653067 0.9048374  1.         1.105171   1.6487212 ]

```

Code #2: Visualization

 `# Importing the Tensorflow library``import` `tensorflow as tf`` ` `# Importing the NumPy library``import` `numpy as np`` ` `# Importing the matplotlib.pylot function``import` `matplotlib.pyplot as plt`` ` `# A vector of size 21 with values from -10 to 10``a ``=` `np.linspace(``-``10``, ``10``, ``21``)`` ` `# Applying the exponential function and``# storing the result in 'b'``b ``=` `tf.exp(a, name ``=``'exp'``)`` ` `# Initiating a Tensorflow session``with tf.Session() as sess:``    ``print``(``'Input:'``, a)``    ``print``(``'Output:'``, sess.run(b))``    ``plt.plot(a, sess.run(b), color ``=` `'red'``, marker ``=` `"o"``) ``    ``plt.title(``"tensorflow.abs"``) ``    ``plt.xlabel(``"X"``) ``    ``plt.ylabel(``"Y"``) `` ` `    ``plt.show()`

Output:

```Input: [-10.  -9.  -8.  -7.  -6.  -5.  -4.  -3.  -2.  -1.   0.   1.   2.   3.
4.   5.   6.   7.   8.   9.  10.]
Output: [4.53999298e-05 1.23409804e-04 3.35462628e-04 9.11881966e-04
2.47875218e-03 6.73794700e-03 1.83156389e-02 4.97870684e-02
1.35335283e-01 3.67879441e-01 1.00000000e+00 2.71828183e+00
7.38905610e+00 2.00855369e+01 5.45981500e+01 1.48413159e+02
4.03428793e+02 1.09663316e+03 2.98095799e+03 8.10308393e+03
2.20264658e+04]
```

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