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A comment on Einsum Is All You Need – Einstein Summation in Deep Learning (2018). Parent comment

Re:Einsum Is All You Need – Einstein Summation in Deep Learn... by mcabbott on Sunday February 03, 2019 @07:25AM (#19069241)
You insert kronecker deltas: ∂M_ab / ∂M_cd = δ_ac δ_bd , and a,b here remain contracted with whatever M was originally contracted with. Then you simplify, δ_ac Z_xya = Z_xyc and so on.
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