Can someone please explain what the quiver plot represents. I am confused after reading the lines " the arrow size represents magnitude of gradient" and The direction and slope of the arrow reflects the ratio of βJ(w,b)βw and βπ½(π€,π)βπ at that point.

This is in reference to Course 1, Week 1, Lab 4 Gradient Descent Solution

Thatβs a confusing method of showing the gradients as vectors within a 2D plot.