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Strategies & Market Trends : Neural Nets - A tool for the 90's
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To: Patrick Slevin who wrote (314)11/27/1998 12:27:00 AM
From: Carl R.  Read Replies (1) of 871
 
Because I crash so often, I download top models frequently and save them in profit. The "save run" feature in NGO does not work (it gives me a message something like "save run cancelled"), so if the computer crashes I have to start everything from scratch. For grins I started a model this afternoon selecting only TDNN and CATNN and it processed about a model a minute, implying that for 10000 models it would take 160 hours. I should add that I like to have diversity in my models so I usually stay with random refill. I flip to clone from time to time, but then flip back to random.

Incidently I have noticed that the TDNN and CATNN models tend to fare poorly on out-of-sample data. I presume that because they have more degrees of freedom they are over-optimized for the data giving great in-sample results. Thus I do not mind limiting my models to BP most of the time.

As for the computational speed, the processing time of Profit/NGO is dependent primarily on the FPU (floating point unit). The Pentium II has an FPU that is about 6 times as fast as a Pentium, if I recall. My 6x86 is faster than a Pentium 200 on most work, but performs about like a Pentium 90 (or less) on FPU work. Thus my current CPU is about equal to a PII runing at 15 MHz when doing floating point work, implying a 30 fold increase with a PII450. NGO is memory resident, and not dependent on bus, disk, or video so the speed improvement should be 20x or more. This is one of only a few applications (along with CAD or graphics games) that takes more than the power I have.

Carl

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