Answer checking of sudoku exercise

[ivanightingale]

This line results in an error

LearningToControlClass/class01/background_materials/optimization_basics.jl

Line 451 in d294ddd

all(isapprox.(anss.x_ss, ground_truth_s.x_ss; atol=1e-3))

since ground_truth_s is actually not a Tuple but a Vector.

LearningToControlClass/class01/background_materials/optimization_basics.jl

Lines 431 to 439 in d294ddd

	ground_truth_s = (x_ss = [[ 5 3 4 6 7 8 9 1 2];
	[6 7 2 1 9 5 3 4 8];
	[1 9 8 3 4 2 5 6 7];
	[8 5 9 7 6 1 4 2 3];
	[4 2 6 8 5 3 7 9 1];
	[7 1 3 9 2 4 8 5 6];
	[9 6 1 5 3 7 2 8 4];
	[2 8 7 4 1 9 6 3 5];
	[3 4 5 2 8 6 1 7 9]])

Adding a , will fix it.

In addition, the ground truth solution is in the format of sudoku solution, while sudoku[:x_s] is a 3D indicator matrix of the numeric values and their positions.

LearningToControlClass/class01/background_materials/optimization_basics.jl

Line 419 in d294ddd

@variable(sudoku, x_s[i = 1:9, j = 1:9, k = 1:9], Bin);

So they cannot be compared directly.

LearningToControlClass/class01/background_materials/optimization_basics.jl

Line 451 in d294ddd

all(isapprox.(anss.x_ss, ground_truth_s.x_ss; atol=1e-3))