Before training, check that your formulas work. With random initial weights, your predictions in column I will be around 0.5, and the MSE will be somewhere near 0.25. That’s expected – the network hasn’t learned anything yet.
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A standard neural network consists of layers of nodes (neurons). In Excel, you can represent these layers across different columns or separate worksheets: build neural network with ms excel full
The answer is surprisingly simple:
Complete example workbook structure (quick map) Before training, check that your formulas work