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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.

Overview

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

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

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
hey
Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
ya I also want to know the raman spectra
Bhagvanji
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
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
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
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
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
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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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