I have a foggy brain right now, I forgot how this happened. Would anyone please explain this to me? This is a loss function. The red circled part is the part I don't understand. How did it become the one after it?
Thank you in advance.
2026-03-26 19:08:10.1774552090
Would anyone please explain this transformation in the loss function to me?
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HINT: $$\bar{y} = \frac{1}{n}\sum_{i=1}^n y_i \;\; .$$