Any assistance is greatly appreciated.
The most likely causes of incorrect results in this assignment are:
- incorrect indentation around the for-loops (this is particularly common if you’re a new Python programmer)
- not using enough sets of parenthesis to force Python to combine the terms in the correct order.
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Note that all the code for this assignment can be found in the ungraded labs earlier in Week 3.
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Your values are about twice as big as the expected values. Did you perhaps forget to divide by 2 somewhere? It’s hard to pinpoint the error without seeing the code. If you send the code to me directly I can take a look.
Best,
Alex
@aachandler, I looked at the notebook earlier today.
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Summary:
If you’re using for-loops over the features ‘j’, be sure that your code uses [j] when updating the dj_dw vector.
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Ah yes you’re absolutely right. I couldn’t spot the error but this is exactly it. I ended up suggesting to implement a vectorized approach which is much less prone to such errors.
Thanks for letting me know!
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