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After tinkering with hyper-parameters, various cost functions, and different activation functions, we built a convolutional neural network ourselves using Python's Theano library and trained it to recognize handwritten digits from 0-9.


We built our network to detect handwritten digits between 0 and 9, comprised of 6 total layers (seen below). We trained and tested our network using the MNIST data set of handwritten digits (50,000 training images, 10,000 test images). During the training, the weights and biases of each neuron in each layer were adjusted to minimize the cost function we used in the stochastic gradient descent algorithm. The first layer in our network is a convolutional layer that takes a 28x28 image and convolves it with 20 different 5x5 filters creating 20 24x24 feature maps. The second layer – a pooling layer – samples the 24x24 feature maps down to 12x12 feature maps. The third layer is another convolutional layer that convolves 40 different 4x4 filters, tuned to detect higher- level features, into 40 8x8 feature maps. The fourth layer pools the output of the second convolutional layer into 4x4 maps. The fifth layer is a fully connected layer of 100 neurons that detects the presence of features in the 4x4 feature maps. Finally the 6th layer is a softmax layer that maps combinations of features from the 5th layer into the output, a length-10 vector where the index of the largest entry was the digit our network guessed.

Our convolutional neural network

neural network
The CNN we structured to recognize handwritten digits

We also designed an applet that allows a user to visualize the flow of data in our network. It lets the user see the effect of our network on an input image (either an image in the MNIST dataset or an image drawn on the screen) and see the output of each layer of our network in real-time. We also designed the GUI to display the trained filters of each convolutional layer and the outputs of each neuron in every layer. This allowed us to gain a visual understanding of how the filters in our network were trained, which characteristics the filters were trained to detect, and how the filters used convolution to recognize the different features of the digits. Additionally it allowed us to test and prove just how accurate our network was, as well as easily identify and fix any cases where our network did not successfully classify digits.

Our image recognition app

The applet we created to visualize the flow of data through our CNN

Questions & Answers

what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
how nano science is used for hydrophobicity
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
what is differents between GO and RGO?
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
How can I make nanorobot?
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
how can I make nanorobot?
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
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Source:  OpenStax, Elec 301 projects fall 2015. OpenStax CNX. Jan 04, 2016 Download for free at https://legacy.cnx.org/content/col11950/1.1
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