top | item 45892174 Xortran - A PDP-11 Neural Network With Backpropagation in Fortran IV 46 points| rahen | 3 months ago |github.com 11 comments order hn newest jacobgorm|3 months ago When I studied cognitive psychology I remember one of the professors told us about how they had been playing with implementing neurals nets on their PDP11 back in the day. I remember thinking that had to have been be a total waste of time. Silly me. rahen|3 months ago The first convolutional neural network, the Neocognitron, was AFAIK implemented on a PDP-11 as well: https://www.semanticscholar.org/paper/Neocognitron%3A-A-neur...No backpropagation back then, this only appeared around 1986 with Rumelhart, probably on VAX machines by that time.The 11/34 was hardly a powerhouse (roughly a turbo XT) but it was sturdy, could handle sustained load and its FPU made the whole difference. load replies (2) fortran77|3 months ago I did a few systems like this in the early 80s, but by then I was on a Vax and running Fortran 77.Nice to see this. It’s a good way to learn the basics without getting bogged down with modern complexities. unknown|3 months ago [deleted]
jacobgorm|3 months ago When I studied cognitive psychology I remember one of the professors told us about how they had been playing with implementing neurals nets on their PDP11 back in the day. I remember thinking that had to have been be a total waste of time. Silly me. rahen|3 months ago The first convolutional neural network, the Neocognitron, was AFAIK implemented on a PDP-11 as well: https://www.semanticscholar.org/paper/Neocognitron%3A-A-neur...No backpropagation back then, this only appeared around 1986 with Rumelhart, probably on VAX machines by that time.The 11/34 was hardly a powerhouse (roughly a turbo XT) but it was sturdy, could handle sustained load and its FPU made the whole difference. load replies (2)
rahen|3 months ago The first convolutional neural network, the Neocognitron, was AFAIK implemented on a PDP-11 as well: https://www.semanticscholar.org/paper/Neocognitron%3A-A-neur...No backpropagation back then, this only appeared around 1986 with Rumelhart, probably on VAX machines by that time.The 11/34 was hardly a powerhouse (roughly a turbo XT) but it was sturdy, could handle sustained load and its FPU made the whole difference. load replies (2)
fortran77|3 months ago I did a few systems like this in the early 80s, but by then I was on a Vax and running Fortran 77.Nice to see this. It’s a good way to learn the basics without getting bogged down with modern complexities.
jacobgorm|3 months ago
rahen|3 months ago
No backpropagation back then, this only appeared around 1986 with Rumelhart, probably on VAX machines by that time.
The 11/34 was hardly a powerhouse (roughly a turbo XT) but it was sturdy, could handle sustained load and its FPU made the whole difference.
fortran77|3 months ago
Nice to see this. It’s a good way to learn the basics without getting bogged down with modern complexities.
unknown|3 months ago
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