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Closed 10 years ago.
When designing mobile robot navigation using Artificial Neural Networks - there is a preference to use Back Propagation Methods instead of Feed Forward Methods, Why ?
Like Eric said, back-prop isn't an alternative to a feed forward networks -- its an addition. With just a feed forward network, your left with the task of figuring out all of the weights yourself, which very rarely makes sense.
Now, back-prop isn't a necessary addition, as there numerous other learning methods ranging from reinforcement learning to evolutionary methods like genetic programming. But you pretty much have to add some learning algorithm to your network to achieve any sort of decent task performance.
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Closed 9 years ago.
I want to know if there is a way to optimize the matlab function gather. I am developing a Cuda code with very huge matrices and I have noticed that the gather function that I have to use to get back my GPU data is quite slow. For a 2^13x2^8 matrix, it takes about 3 seconds!
The performance of gpuArray.gather is limited by your PCI bus. You can optimise this only by gathering less data (e.g. using indexing). Note that in more recent versions of Parallel Computing Toolbox, many of the operations are asynchronous, but gather is not - so perhaps you are simply seeing the time for the asynchronous requests to complete. You can check using wait(gpuDevice) to synchronize the device.
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Closed 10 years ago.
I'm completely new to Modelica and was wondering what is the best way to learn on my own? Also I will be using it with MapleSim 5 (or 6 when it will be available) so any information regarding that would be helpful too.
I'll need Modelica to create a few components for a thermal model, then simulate with MapleSim and hopefully I will also manage to co-simulate with another software (EnergPlus) using FMI when it will be available for MapleSim and BCVTB.
Sorry for not being specific with my question, really any reference to a good Modelica guide would be great, thanks.
Clearly, I am biased, but I like to think that my book "Introduction to Physical Modeling with Modelica" is a great way to explore the features of Modelica in the context of engineering problems. I noticed that Wolfram seems to recommend the book as well.
But in the interest of balance, there are two books by Peter Fritzson on the topic of Modelica as well.
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Closed 10 years ago.
What language can you recommend (and why) for making networking tools:
network analyzer (packet sniffing)
speedtest (sending traffic, calculating the total speed and involving QoS analyses)
network monitor (promiscious mode network listener)
SSH client (with own extensions)
I'm thinking about: Java, C# or C++ (reason: Object oriented, found some standard functions in the language itself without having to import existing api's)
The purpose is to learn to write such apps without the use of API's.
I would use an unmanaged language for the sensitive parts of the apps. Anything where latency and absolute performance are an issue. I'd use Java or a managed .Net language for everything else.
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Closed 11 years ago.
I am very interested in machine learning. i have an idea to develop a program which can generate a source code according to a given standards. for example if i have trained the system to how to write something to console and the standard way of using variables then it should be able to generate a source code for anything which i ask to print something to the console, likewise. Is there any resources source codes or existing open source projects?
You might be interested in Genetic Programming. It's a genetic algorithm that operates directly on programs.
The demo I saw used Lisp (Common Lisp, I think), which is a natural fit, but any language with eval should be decently easy to use.
The Wikipedia page lists a whole pile of implementations, many of them open source, so you should be able to start there.
This sounds like this is would be a Constraint Satisfaction [CSPs] or Search Problem, these approaches would probably be your best bet:
Genetic Algorithm
Some sort of goal seaking heuristic [with negative/positive reenforcements]
The algorithms that are under the CSP category.
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Closed 9 years ago.
can anyone give me sample code to transfer photos from one iphone to another using bluetooth
Your best bet would to use GameKit, which greatly simplifies connecting multiple devices over Bluetooth & transfering data. I can't remember having seen an Apple sample which does that, but it certainly would be possible. This is exactly what GameKit was intended for, peer-to-peer connectivity, not only limited to gaming.
You'll probably have to split the data of the image and send little chunks to the other device, which can reassemble the chunks to form the original file once finished.
http://developer.apple.com/iphone/library/documentation/NetworkingInternet/Conceptual/GameKit_Guide/Introduction/Introduction.html