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Class and functions to store interaction operators.
class InteractionOperator: Class for storing 'interaction operators' which are defined to be fermionic operators consisting of one-body and two-body terms which conserve particle number and spin.
class InteractionOperatorError: Common base class for all non-exit exceptions.
get_active_space_integrals(...): Restricts a molecule at a spatial orbital level to an active space
get_tensors_from_integrals(...): Converts one and two-body integrals into tensor form