Chain rule
Concept
The fundamental calculus principle behind backpropagation, which Theano uses for automatic differentiation.
Mentioned in 2 videos
Videos Mentioning Chain rule

Theano Tutorial (Pascal Lamblin, MILA)
Lex Fridman
The fundamental calculus principle behind backpropagation, which Theano uses for automatic differentiation.

Torch Tutorial (Alex Wiltschko, Twitter)
Lex Fridman
A fundamental rule in calculus used to compute the derivative of composite functions, essential for automatic differentiation.