Week 2 Logistic Regression Gradient Descent. A notation question

Course Q&A Deep Learning Specialization Neural Networks and Deep Learning
1

Hi,

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?

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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

2

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

3

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