lesson07 derivative issue

[psteinb]

from the mentors feedback

• In my group it was brought up that in the video for Lesson 7 (t ~ 32:10), the derivatives for dL/dw and dL/db seem to be wrong. Especially for dL/db, it is derived as relu'(1) = 1 assuming that the parentheses indicate a function call, but actually it should be relu'(v)*1 plugging in the concrete value for v that emerges from the other variables x, w, b