Struct no_scope_guard

• Defined in File eval.hpp

Struct Documentation

struct no_scope_guard

Default scope-guard factory for make_batched_custom_evaluator: produces a no-op guard. A backend may supply a factory whose returned RAII object relaxes block-sparse screening for the duration of the batched partial contractions, so that a result block whose norm clears the screening threshold over the full batch axis is not dropped in every individual batch (which would lose its contribution to the sum). The factory is called with the batch count, so the backend can scale the relaxation accordingly (e.g. divide a Cauchy-Schwarz norm-product screening threshold by n_batches: the bound for a sub-sum over 1/n of the batch axis is ~1/n of the full bound). See make_batched_custom_evaluator’s make_scope_guard parameter.