Neural Networks Hebbian

GHAPACK: A Library for the Generalized Hebbian Algorithm
.frontiersin.org. Figure 6

I recently joined a new open source project called GHAPACK. The project currently provides the functionality and the means to use the Generalized Hebbian Algorithm. I came across this project after banging my head against some of the practical limitations of Singular Value Decomposition (SVD). GHA is a Hebbian-based neural network-like algorithm that approximates SVD’s ability to perform eigen decomposition. Its added bonus is that it allows for incremental training so you can refine your model with new data without having to recompute using the entire dataset.

Your Trusty SVD Tool

SVD is one of those tools that every machine learning practitioner and computational geek will pull out at some time or another. It’s a powerful matrix factorization technique that allows you to get at the matrix’s eigenvectors and eigenvalues. One of reason it tends to be used so often is the fact that it can be used on those pesky M x N matrices, which us data junkies tend to generate.

For most small problems I can just use scipy and numpy’s svd and never give it a second thought. LAPACK’s suite of SVD routines power the svd functions of scipy, numpy, and MATLAB among others. It is developed for dense matrices and processes them in their entirety. What happens when you start dealing with problems in high-dimensional space? Those dense representations and full processing are expensive. So, when your problem space is better suited for sparse matrices you tend to run into not enough memory, non-convergence…no SVD.

Source: Kurt GrandisKurt Grandis

You might also like:

Playing By Ear -- Neuroscience
Playing By Ear -- Neuroscience
Khepera robot - avoiding obstacles
Khepera robot - avoiding obstacles
Dr. Donald Hebb - Nova Scotias Science Hall of Fame
Dr. Donald Hebb - Nova Scotias Science Hall of Fame

Monday prosper reading material...

2008-08-25 09:22:48 by grativo

1. This loan will provide the necessary capital to purchase software, marketing materials and entrepreneurial educational tool taught by master entrepreneur and CEO of Nouveau Riche University, Jim Piccolo. With the ability to now focus full-time as opposed to free-time I expect to increase my income to a respectable $1,800/month.
2. Seriously folks, this loan will be used to take my Forex Trading Strategy, which is working very well, to the next level. Look at the picture in the listing. Over 150% profit in 13 days of active, 24 hour, automated trading using my software. (Turns out never traded for real money)
3. This loan will be used to help me invest 10k into a forex managed account investment fund. I am a good candidate for this loan because I am investing my own money...

No Loss Trading Plan that really works for your.

2008-01-18 20:41:56 by bfnnrgn

Are you in the Dallas, TX area? I have a trading plan that is non speculative, non directional, and generates a very high rate of return. It works everyday - all the time - with no losses - (yes) it "really" works. I have been trading the financial markets for 30 years and I understand exactly what I am doing. As a demo, I started trading a friends Forex account of just $6,000.00 on 12/20/07 and I generated a 100% return in just three weeks using leverage with no losses. Luck was not part of the success. A properly funded brokerage account will never have losses. I know it sounds unlikely but I can demonstrate and prove it "is" true. It took me most of my life to develop this technique and it did not come cheap to me. I call it my zero sum no loss trading plan and it will beat any...

Pay one way or another

2005-09-04 14:25:42 by o-lOl-o

$2000 for an online course huh. If it works for you. A few weeks is really good to actually begin to profit in live trading. Staying consistant over the long hual is the trick now. That takes discipline. Avoid the blowout sessions where a trader chases good money after bad trying to recoup losses. Or greedily jumps into a trade with little research.
I home schooled myself over about a year period. I didn't have the money to trade at the time so it really didn't matter. I was content to learn and save till I had it. I had some expenses that was a priority over forex. When I did have the extra cash not swallowed by life I had been profiting for over 6 months on paper and the transition to live was relatively seemless.
I'm getting nice returns now for almost a year live. From...

Markets Live: Shares up as earnings flow in  — Sydney Morning Herald
3:46pm: Leighton Holdings said today it was in negotiations to sell 70 per cent of its telecommunication assets, including its NextGen Networks fibre-optic business, to Canada's Ontario Teachers' Pension Plan. The sale values the entire assets, which ...

Pergamon Four Major Hypotheses in Neuroscience (Neural Networks, Volume 9 Number 8, November 1996 (1996 Special Issue))
Book (Pergamon)

Related posts:

  1. Neural Networks DEA
  2. Neural Networks NetBeans
  3. Neural networks using C
  4. Neural Networks in Java