formula fix

[jancervenka]

In the gradient descent with momentum formula, I think the gradient function $L^\prime$ should use $x^{[t-1]}$ to cumpute the new delta.

$$ \Delta_x^{[t]} = lr \cdot L^\prime(x^{[t-1]}) + p \cdot \Delta_x^{[t-1]} $$

[github-actions[bot]]

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[8bitmp3]

@MarkDaoust @markmcd PTAL

[markmcd]

LGTM. The whole point is to calculate $x^{[t]}$, so that makes sense.

Thanks for the fix.