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A confusion matrix
A confusion matrix detailing the results of a testing run.

Confusion matrices are used to analyze the results of the full testing runs. A confusion matrix, also known as an error matrix, gives a visual representation of the performance of a learning algorithm--in our case, using scattering coefficients to train an SVM. Each entry in the matrix corresponds to the predicted accent versus the actual accent, with entries along the diagonal representing correctly predicted accents. While no column contained perfect classification accuracy, we were still able to correctly classify four out of five of the accents. We found that the overall accuracy of the confusion matrix was 50%, with a high misclassification of French as Spanish. We found an overall tendency for languages to be classified as Spanish, which we believe is due to the diversity of the Spanish accent sound samples. The accent database had fewer Spanish accent samples than the other four languages so the samples included speakers from many Spanish speaking countries. The diversity in the Spanish accent sound samples might have led to the high rates of misclassification as Spanish observed.

graph1
Results of tuning the parameters of the input data.

When tuning the input data parameters — the number of chunks and the length of each chunk — we found that, in general, having two total chunks resulted in the best performance. Furthermore, the system performed well when the total time of the sound analyzed — the length of each chunk times the number of chunks — was four seconds, a trend which is highlighted in red on the graph. We hypothesize that this occurs because the sound clips are relatively synchronized up until four seconds, with the pace of the speaker being increasingly significant afterwards. We applied these results to later tests by using a pair of two second chunks as the input data parameters.

Graph2
Results of tuning the parameters of the SVM.

Through testing combinations of box constraint and kernel scale parameters for linear, gaussian, and polynomial support vector machine models, we were able to determine the optimal parameters for classification accuracy. We found that the linear model produced far worse results than the gaussian and polynomial models and eliminated it from further analysis. The gaussian model had better overall accuracy compared to the polynomial model, so we chose our ideal testing parameters to be in the range of its lightest squares — corresponding to about 50% accuracy. These parameters were used to produce the confusion matrix seen earlier.

Questions & Answers

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
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
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
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.
Bharti
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
Daniel
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
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
How can I make nanorobot?
Lily
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
NANO
how can I make nanorobot?
Lily
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
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.
Tarell
what is the actual application of fullerenes nowadays?
Damian
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.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
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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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