Gradient Descent Algorithm optmization in C++.

Gradient Descent.

$$ x_{n+1} = x_n - \gamma \nabla F(x_n) $$

1. Pick a starting point.
2. Compute Gradient at this point.
3. Compute next point, Xn + 1, using the negative of this gradient.
4. Iterate steps 2 & 3 until some threshold reached.

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