Week 2 Logistic Regression Gradient Descent. A notation question


I’m getting a bit lost keeping track of the letters. Where we are calculating the logistic regression derivatives there are two a’s in different fonts. Are they representing different things?

The a in the loss function should be the output of logistic regression. Does the other a represent something different?

Week 2 - Logistic Regression Gradient Descent

It’s an error in the slide, those should be the same font.

Thank you. I thought that was what it was but I was second guessing myself.