apply_op_itrunc_fit()

SRDef syten::MPS::apply_op_itrunc_fit	(	State &	a,
		Operator const &	op,
		Truncation	trunc,
		SRDef	desired_change,
		Index	max_opt_sweeps
	)

Applies the operator op onto the state a using the itrunc/zip-up method and then does some additional single-site optimisation sweeps on the result.

Parameters

[in,out]	a	input and output state
[in]	op	operator to apply to the state
[in]	trunc	truncation criterion for the final state
[in]	desired_change	sweep until the change per two sweeps is smaller than this
[in]	max_opt_sweeps	do at most this many full sweeps

Returns

the error, NAN at the moment (error not calculated)

References apply_op_itrunc(), apply_op_orthogonalise_fit(), std::move(), and std::tie().

Referenced by syten::do_apply_op().

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