Hello,
I am having trouble with the compute_cost function when I run the test with 0’s i get this output;
Cost at initial w and b (zeros): 1.386
Expected:
Cost at initial w and b (zeros) 0.693
This is throwing off the calculation somewhere I’ve copied the code from the hint section but it’s still not working.
Here’s the lab session;
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Your lab session does not help, no one but the course staff can see your submission data.
Hint:
When the weights are zeros, then the sigmoid of z will always be sigmoid(0) = 0.5. It’s the same value for both the true and false cases. When you do the math to compute the cost, that will give a value of 0.693 (because that’s the natural log of 0.5).
Note also the following mathematical relationship:
0.693 * 2 = 1.386
Are you sure that your code faithfully implements the mathematical formula for the cost? The above relationship seems like a clue about the nature of the problem. 
my indentation was off which doubled the first “for” loop. thanks all.