#residual-connection

Question 1: Single choice

How does a residual block differ from an Inception block in the way it combines its branches?

A residual block concatenates its input and output along the channels; Inception adds its four branches together1
Both concatenate their branches along the channel axis, so they differ only in which kernel sizes they use2
A residual block adds a learned branch to an identity path; Inception concatenates four learned branches3
Both add their branches elementwise, so they differ only in how many parallel branches they contain4