Tesorflow

"TensorFlow is an open source software library for numerical computation using data flow graphs. The graph nodes represent mathematical operations, while the graph edges represent the multidimensional data arrays (tensors) that flow between them. This flexible architecture lets you deploy computation to one or more CPUs or GPUs in a desktop, server, or mobile device without rewriting code. TensorFlow also includes TensorBoard, a data visualization toolkit."
-- words from tensorflow documentation

Installation

See Installing TensorFlow for instructions on how to install our release binaries or how to build from source.

Try your first TensorFlow program

$ python

>>> import tensorflow as tf
>>> hello = tf.constant('Hello, TensorFlow!')
>>> sess = tf.Session()
>>> sess.run(hello)
'Hello, TensorFlow!'
>>> a = tf.constant(10)
>>> b = tf.constant(32)
>>> sess.run(a + b)
42
>>> sess.close()

see the file in action gettingstarted.py

Let's begin with MNIST

I would recommend to follow this guide

The guide is for begineers and really helpful to follow next.

Now Let's see the 5 layered neural network here

Now on increasing one more hidden layer, check this out