Exercise 3 in 2.1 np.roll is used to change 1st row with last not first column with last column

[bilalayaz2]

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1. //Setup the parameters you will use for this exercise
2. input_layer_size = 400 // 20x20 Input Images of Digits
3. hidden_layer_size = 25 // 25 hidden units
4. num_labels = 10 // 10 labels, from 0 to 9

6.//Load the .mat file, which returns a dictionary
7. weights = loadmat(os.path.join('Data', 'ex3weights.mat'))
8.
9. //get the model weights from the dictionary
10. // Theta1 has size 25 x 401
11. //Theta2 has size 10 x 26
12. Theta1, Theta2 = weights['Theta1'], weights['Theta2']
13.
14. //swap first and last columns of Theta2, due to legacy from MATLAB indexing,
15. //since the weight file ex3weights.mat was saved based on MATLAB indexing
16. Theta2 = np.roll(Theta2, 1, axis=0)

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here we are swapping first and last row not column (as stated in line 14 [which is incorrect]) with axis = 0 (in line 16) not column .