Einsum

• 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