# Einsum ## Blogs - [rockt](https://rockt.ai/2018/04/30/einsum) - https://einops.rocks/1-einops-basics/ ## Examples - Matrix transpose - ij -> ji - Sum - ij -> - Column sum - ij -> j - Row sum - ij -> i - Matrix vector multiply - ik, k -> i - Matrix matrix multiply - ik, kj -> ij - Dot product - i,i -> - ij, ij -> - Hadmard product - ij, ij -> ij - Outer product - i,j -> ij - Batch matrix multiply - ijk, ikl -> ijl - Tensor Contraction - pqrs , tuvr -> pstuv