Week 1 Prog Assignment 3: Gradient_Checking: def gradient_check_n Error

[OlaOyo]

Hi Deep learning community,

In week 1, programming assignment 3, (Gradient_Checking), on implementing the function
def gradient_check_n(parameters, gradients, X, Y, epsilon=1e-7, print_msg=False)
I get the following error

Any suggestions will be much appreciated @ balaji.ambresh

[balaji.ambresh]

As shown in the equation from the notebook, you should consider all components when calculating the difference and not just the dimension you changed:

difference = \frac {\| grad - gradapprox \|_2}{\| grad \|_2 + \| gradapprox \|_2 }

[OlaOyo]

fixed. thanks alot

[Panas_Rattanasuwan]

I’ve just encountered this same issue but still confused with this. Can you please explain a little bit more?

[OlaOyo]

@OlaOyo

def gradient_check_n

@Panas_Rattanasuwan while the numerator follows
np…(value_a, value_b), the denominator has them as in the example

np…(value_a) + np…(value_b)

[balaji.ambresh]

Please confirm which part is unclear to you.

[Panas_Rattanasuwan]

I’d like to know what you mean by “all components”. Is grad (and gradapprox) itself the whole component?

[Panas_Rattanasuwan]

Here’s my output error. Seems like there are others posting this exact error too I’ll check it out.

[Panas_Rattanasuwan]

Thanks for your reply. I’ve already found the mistake. It was just the missing of parentheses. @OlaOyo

[Atreya_Kandi]

Hi,

I am facing the same issue and have tried all the solutions which has been provided but still I am unable to get my output. Can someone please help?

[balaji.ambresh]

Please click my name and message your notebook as an attachment.

[balaji.ambresh]

Please fix the mistakes in the line theta_minus[i] in function gradient_check_n to pass the tests. You’ve implemented theta_plus[i] correctly.

[Atreya_Kandi]

Hi Balaji,

Thanks for pointing my mistake, I am now able to execute code block correctly.