quemb.molbe.sparse_2el_integral

Functions

account_for_symmetry(reachable)	Account for permutational symmetry and remove all q that are larger than p.
conversions_AO_shell(mol)	Return dictionaries that for a shell index return the corresponding AO indices and for an AO index return the corresponding shell index.
find_screening_radius(mol[, auxmol, ...])	Return a dictionary with radii for each element in mol that can be used to screen the 2-electron integrals to be lower than threshold.
get_atom_per_AO(mol)
get_blocks(reachable)	Return the value of the border elements of contiguous blocks in the sequence X."
get_complement(reachable)	Return the orbitals that cannot be reached by an orbital after screening.
get_dense_integrals(ints_3c2e, df_coef)	Compute dense ERIs from sparse 3-center integrals and sparse DF coefficients.
get_orbs_per_atom(atom_per_orb)
get_orbs_reachable_by_atom(orb_per_atom, ...)
get_orbs_reachable_by_orb(atom_per_orb, ...)
get_reachable(mol, atoms_per_orb[, ...])	Return the sorted orbitals that can by reached for each orbital after screening.
get_sparse_DF_integrals(mol, auxmol[, ...])	Return the 3-center 2-electron integrals in a sparse format with density fitting
identify_contiguous_blocks(X)	Identify the indices of contiguous blocks in the sequence X.
to_numba_input(exch_reachable)	Convert the reachable orbitals to a list of numpy arrays.
traverse_nonzero(g[, unique])	Traverse the non-zero elements of a semi-sparse 3-index tensor.

Classes

MutableSemiSparse3DTensor(shape, exch_reachable)	Special datastructure for semi-sparse and partially symmetric 3-indexed tensors.
SemiSparse3DTensor(unique_dense_data, shape, ...)	Special datastructure for semi-sparse and partially symmetric 3-indexed tensors.
SemiSparseSym3DTensor(unique_dense_data, ...)	Special datastructure for semi-sparse and partially symmetric 3-indexed tensors.
SparseInt2()	Sparsely stores the 2-electron integrals using chemist's notation.