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In chapters 1-5 the error is always error = (pred - true) ** 2 and delta is always delta = pred - true, ie the goal is always subtracted from the prediction.

In chapter 6 the error is error = (goal_prediction - prediction) ** 2 and delta = prediction - goal_prediction. So now the error is calculated in the opposite way ie the prediction is subtracted from the goal.

The question is does it matter whether you subtract prediction from goal, or subtract goal from prediction?

Anthony Perkins