# Assignment 1 - Logistic Regression

• Week 1
• Link to the classroom item you are referring to:

I am getting this error. Can someone help me to solve this error:

``````AttributeError                            Traceback (most recent call last)
AttributeError: 'NoneType' object has no attribute 'log'

The above exception was the direct cause of the following exception:

TypeError                                 Traceback (most recent call last)
<ipython-input-16-03cf85aa5c36> in <module>
8
---> 10 tmp_J, tmp_theta = gradientDescent(tmp_X, tmp_Y, np.zeros((3, 1)), 1e-8, 700)
11 print(f"The cost after training is {tmp_J:.8f}.")
12 print(f"The resulting vector of weights is {[round(t, 8) for t in np.squeeze(tmp_theta)]}")

<ipython-input-15-66d818b00f54> in gradientDescent(x, y, theta, alpha, num_iters)
26         # calculate the cost function
27         #J = (-1/m)*(np.dot(y.transpose(),np.log(h)) + np.dot((1 - y).transpose(),np.log(1 - h)))
---> 28         J = -(1/m)*np.sum(y*np.log(h)+(1-y)*np.log(1-h))
29
30         # update the weights theta

TypeError: loop of ufunc does not support argument 0 of type NoneType which has no callable log method
``````

This is the method:

{moderator edit - solution code removed}

1 Like

It looks like either you have not run the â€śimportâ€ť cell that imports `numpy` as `np` or you have assigned â€ś`None`â€ť to the variable `np` someplace in your code.

Kernel â†’ Restart and Clear Output
Cell â†’ Run All

and see if that fixes the problem. Or do â€śCell â†’ Run All Aboveâ€ť and then rerun that test.

One other theory is that, since the `np.dot` call earlier in the function did not â€śthrowâ€ť, that there is some invisible special character that you typed in the `np.log` in the J line, so itâ€™s not really the variable `np`, but somehow still looks like it. The other thing to try would be typing that line over again carefully.

1 Like

Until this cell, the everything is working fine and as it is. I did not change anything. It throwing an error in the line I created for calculating the cost function.

I did â€śrestarted & clear outputsâ€ť and â€śrestart and run allâ€ť so many times. And also I did Cell â†’ Run all above. But still I could not solve it. I retyped the line again. But it didnâ€™t help me to solve.
Now, this is the second day, I am struggling to solve this.

1 Like

Please check your DMs for a message from me about how to get to the next step here.

1 Like

It appears you may have incorrect indentation here:

2 Likes

The problem is that your `sigmoid` function fails the tests in the notebook. It looks like you did not implement it, which is where the `NoneType` error is coming from.

4 Likes