> Is there a compiler-autograd "library"? Do you mean the method theano is using? Anyway, the performance bottleneck often lies in matrix multiplication or 2D-

> Is there a compiler-autograd "library"? Do you mean the method theano is using? Anyway, the performance bottleneck often lies in matrix multiplication or 2D-CNN (which can be reduced to matmul). Compiler autograd wouldn't save much time.