What is the average size of a neural network, for example, for recognition of numbers, faces, people and motion detection?

Question

Neural networks

I would like to know roughly what the price is.
How many machine resources are needed for such tasks.

How much disk space does it take, how much RAM do you need, and what is the load on the processor.

Answer 1

Motion detection has very few resources, even the processor in the cameras can handle it, but it looks like it's all done at the hardware level.
With faces on a bare xeon-e5 2800 DLIB processor (~4sec) 40 faces, a sample from a dataset of 10,000
On a GeForce GTX 1660 ~16 fps
Look at the numbers here
https://habr.com/ru/post/439330/
OpenCV on idea faster 2-3 times