Week 2 - Exercise 3 - sigmoid

Hi, @Cristiano_Ranieri. I do not recognize this version of the notebook, and it does not seem to correlate with any of the recent versions that I have seen. For example, the “signature” of the function takes z as an argument, not x. The test cell is also foreign to me. You should follow the “Get Latest Version” procedure on the FAQ Thread to verify. It’s the very first FAQ.