use numpy.einsum instead of lib.einsum for memory bounded operations
use numpy.einsum instead of lib.einsum for memory bounded operations

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