Replace np.einsum with einsum in ao2mo/eris.py
Replace np.einsum with einsum in ao2mo/eris.py

gkc1000/pyscf,sunqm/pyscf,gkc1000/pyscf,gkc1000/pyscf,gkc1000/pyscf,gkc1000/pyscf,sunqm/pyscf,sunqm/pyscf,sunqm/pyscf