What does sigmoid_test here? and also all the function_name_test in the following questions. since our function name is sigmoid and no such function exists. it gives me error every time

Hi @Yiguo_Wang ,

sigmoid_test() is a public test for testing your sigmoid() function. Public tests are imported to the assignment, the import statement can be found at the top.
I suggest you restart the kernel, rerun you code from the beginning.

Hi Kic,

I restarted the kernel and it does not work. Also, I didnt see the code of importing public test in the notebook. Can you paste them to me?

Restarting Kernel alone is not enough. You have to run all the cells. And, the first cell imports all the test functions. Can you share the screenshot of the first cell?