Xiwei She asked . 2022-05-17

How to use Gamma distribution as the kernel of Naive Bayes in MATLAB code?

Here I have a group of data which following the Gamma distribution and now I want to use Naive Bayes method to fit this data. I tried the original function named 'fitcnb' and knowing that it providing 4 types of distribution: 'box', 'epanechnikov', 'normal' and 'triangle'. Now I want to revise this fitcnb function through adding Gamma distribution kernel into its original code. But I'm not sure how to implement that, can anyone give me some hint or example code? Many thanks for that.

gamma distribution , naive bayes , AI, Data Science, and Statistics , Statistics and Machine Learni

Expert Answer

Prashant Kumar answered . 2024-04-21 08:39:17

If your features follow a Gamma distribution you should be fine just using the 'normal' smoothing Kernel. To provide some intuition the Kernel prior is using a Kernel smoothing function to approximate the distribution of the features from the discrete data. You can think of it as trying to drop a table-cloth over the histogram to smooth out the jumps the histogram creates.
 
To illustrate this, let's sample from a Gamma distribution
 
 
dataSamp = gamrnd(9,0.5,1e5,1); % Gamma Samples.
histogram(dataSamp,'Normalization','pdf') % Visualize pdf

Fit a Kernel distribution (tablecloth) with the restriction that the support is positive (as is the case with the Gamma distribution).

dist = fitdist(dataSamp,'kernel','Kernel','normal','Support','positive');

Evaluate the pdf of the distribution and plot on the histogram

xVals = linspace(0,15,1000); % x Values to evaluate the pdf
yFit = pdf(dist,xVals); % pdf values at each xVals
hold on
plot(xVals,yFit,'LineWidth',2) % Plot the fitted pdf.
hold off

This is exactly what is happening in fitcnb when you use the same calls

Mdl = fitcnb(___,'DistributionNames','kernel','Kernel','normal','Support','positive')

There is no need to modify the existing code to support directly the Gamma distribution, which I image would be akin to coding it from scratch (if not more difficult).


Not satisfied with the answer ?? ASK NOW

Frequently Asked Questions

MATLAB offers tools for real-time AI applications, including Simulink for modeling and simulation. It can be used for developing algorithms and control systems for autonomous vehicles, robots, and other real-time AI systems.

MATLAB Online™ provides access to MATLAB® from your web browser. With MATLAB Online, your files are stored on MATLAB Drive™ and are available wherever you go. MATLAB Drive Connector synchronizes your files between your computers and MATLAB Online, providing offline access and eliminating the need to manually upload or download files. You can also run your files from the convenience of your smartphone or tablet by connecting to MathWorks® Cloud through the MATLAB Mobile™ app.

Yes, MATLAB provides tools and frameworks for deep learning, including the Deep Learning Toolbox. You can use MATLAB for tasks like building and training neural networks, image classification, and natural language processing.

MATLAB and Python are both popular choices for AI development. MATLAB is known for its ease of use in mathematical computations and its extensive toolbox for AI and machine learning. Python, on the other hand, has a vast ecosystem of libraries like TensorFlow and PyTorch. The choice depends on your preferences and project requirements.

You can find support, discussion forums, and a community of MATLAB users on the MATLAB website, Matlansolutions forums, and other AI-related online communities. Remember that MATLAB's capabilities in AI and machine learning continue to evolve, so staying updated with the latest features and resources is essential for effective AI development using MATLAB.

Without any hesitation the answer to this question is NO. The service we offer is 100% legal, legitimate and won't make you a cheater. Read and discover exactly what an essay writing service is and how when used correctly, is a valuable teaching aid and no more akin to cheating than a tutor's 'model essay' or the many published essay guides available from your local book shop. You should use the work as a reference and should not hand over the exact copy of it.

Matlabsolutions.com provides guaranteed satisfaction with a commitment to complete the work within time. Combined with our meticulous work ethics and extensive domain experience, We are the ideal partner for all your homework/assignment needs. We pledge to provide 24*7 support to dissolve all your academic doubts. We are composed of 300+ esteemed Matlab and other experts who have been empanelled after extensive research and quality check.

Matlabsolutions.com provides undivided attention to each Matlab assignment order with a methodical approach to solution. Our network span is not restricted to US, UK and Australia rather extends to countries like Singapore, Canada and UAE. Our Matlab assignment help services include Image Processing Assignments, Electrical Engineering Assignments, Matlab homework help, Matlab Research Paper help, Matlab Simulink help. Get your work done at the best price in industry.