yzhliu commented on issue #2498: [TVM] Automatic differentiation for tensor expressions URL: https://github.com/apache/incubator-tvm/pull/2498#issuecomment-595650436 @sgrechanik-h I have difficulty understand [this part](https://github.com/sgrechanik-h/tvm/blob/autodiff-dev/src/pass/zero_elimination.cc#L1641-L1645), would be helpful if you can provide some guide, say we have `A x = b => U^T S V^T x = b` the solution for `x` is `V S^{-1} U b + K z`, in which `K` is the right `m-r` columns of `V` and `z` is arbitrary vector. in my understanding, * `old_to_new` is `V^T` * `matrix` is `S` * `rhs` is `U b` * `solution[]` in the code is `V^T V S^{-1} U b + V^T K z` Then the for-loops in the code calculates `V^T * solution`, how does it equal to original `x` ?
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