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Either softmax or CCE (or both) are broken

When trying to use softmax with MSE on the mnist example, I get a panic. When trying to use sigmoid with CCE, I get an extremely small loss and the model does not work. I do think that second one is just how CCE works though and it is not actually a bug. The softmax/MSE panic is as follows:

goroutine 52164 [running]:
gorgonia.org/gorgonia.(*maxPoolDiffOp).f32s(0xc2d770?, 0x10, 0x20, 0x4?, 0x4?, 0x31, 0x10, 0x10, {0xc01146a000, 0x6200, ...}, ...)
        /home/joshpattman/go/pkg/mod/gorgonia.org/[email protected]/op_nn.go:1047 +0x370
gorgonia.org/gorgonia.(*maxPoolDiffOp).do(0xc000074980, {0xc34a00, 0xc003758b00}, {0xc34a00, 0xc002525e00}, {0xc34a00, 0xc002525f00}, {0xc34a00, 0xc003758a00})
        /home/joshpattman/go/pkg/mod/gorgonia.org/[email protected]/op_nn.go:1017 +0x488
gorgonia.org/gorgonia.(*maxPoolDiffOp).Do(0xc00ee30000?, {0xc00019aec0?, 0x5?, 0xc001f4dd98?})
        /home/joshpattman/go/pkg/mod/gorgonia.org/[email protected]/op_nn.go:946 +0x385
gorgonia.org/gorgonia.(*execOp).exec(0xc00ee7b2c0, 0xc00ee30000)
        /home/joshpattman/go/pkg/mod/gorgonia.org/[email protected]/vm_tape_nocuda.go:82 +0x4e3
gorgonia.org/gorgonia.(*tapeMachine).runall(0xc00ee30000, 0x3dcccccd3dcccccd?, 0x3dcccccd3dcccccd?)
        /home/joshpattman/go/pkg/mod/gorgonia.org/[email protected]/vm_tape.go:239 +0x102
created by gorgonia.org/gorgonia.(*tapeMachine).RunAll in goroutine 1
        /home/joshpattman/go/pkg/mod/gorgonia.org/[email protected]/vm_tape.go:212 +0x145
exit status 2

Interestingly, the model actually trains for a small amount of batches before the panic occurs.

I will try to implement my own softmax function and see if this fixes it.

Strange panic when running example 4

I get a panic when running example 4, but only sometimes. The panic also does not happen immediately, but instead after some number of epochs. The weird part is, sometime the code runs absolutely fine. This may be an issue on my laptop, I have yet to test it on my PC.

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