CNI/NeuralNetwork: Practice neural network with number recognition.

DricomDragon ce244e1f15 Add the argument of number hidden neurons		4 lat temu
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benchmark.py	2a1825c259 Make the code more legible by adding comments	4 lat temu
generator.py	ce244e1f15 Add the argument of number hidden neurons	4 lat temu
io_mnist.py	2a1825c259 Make the code more legible by adding comments	4 lat temu
neural.py	2a9623e148 Add parameter for hidden neurons number	4 lat temu
trainer.py	242356b3be Remove copy	4 lat temu