I do not know how to make an independent area (fc2.2) in the fc2 layer.
The first neuron is the main neuron that makes loss.
The second neuron decides from which input to add data to fc2.2
The third neuron decides what data to delete.
The fc2.2 region is independent and the data in it depends on the neuron 2, 3.
Neurons 1, 2, 3 are independent (this is not one layer), but they should see the loss function.

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