Struct TwoSiteStepResultBlockSparse

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pub struct TwoSiteStepResultBlockSparse<T: Scalar, S: Sector> {
    pub eigenvalue: T::Real,
    pub residual: T::Real,
    pub iters: usize,
    pub converged: bool,
    pub u: BlockSparseTensor<T, S>,
    pub s: BlockScalars<<T as Scalar>::Real, S>,
    pub vt: BlockSparseTensor<T, S>,
    pub trunc_err: T::Real,
}

Expand description

Result of a single BlockSparse 2-site DMRG step: smallest local eigenpair plus the truncated-SVD split of its eigenvector.

u, s, vt are returned separately so the caller (the BlockSparse sweep driver super::sweep_2site) decides which side absorbs S. Mirrors super::heff::TwoSiteStepResult for the Dense path.

Debug is not derived because BlockSparse: !Debug; tests that need to inspect the result destructure its fields directly.

Fields§

§eigenvalue: T::Real

Local-block variational minimum (smallest H_eff eigenvalue).

§residual: T::Real

Local-eigensolver true residual ‖H v − λ v‖₂.

§iters: usize

Number of local-eigensolver iterations.

§converged: bool

Whether the local eigensolver reported convergence (Lanczos by its absolute true-residual test, ARPACK by its relative-tol stopping criterion).

§u: BlockSparseTensor<T, S>

Left singular vectors. Legs [chi_l, d_i, bond(In)], flux = identity(). Left-canonical at axes (chi_l, d_i).

§s: BlockScalars<<T as Scalar>::Real, S>

Singular values per fused sector (descending within each sector).

§vt: BlockSparseTensor<T, S>

Right singular vectors. Legs [bond(Out), d_{i+1}, chi_r], flux = psi_flux. Right-canonical at axes (d_{i+1}, chi_r).

§trunc_err: T::Real

Frobenius norm of the discarded singular values.

Auto Trait Implementations§

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impl<T, S> Freeze for TwoSiteStepResultBlockSparse<T, S>
where <T as Scalar>::Real: Freeze, S: Freeze,

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impl<T, S> RefUnwindSafe for TwoSiteStepResultBlockSparse<T, S>
where <T as Scalar>::Real: RefUnwindSafe, S: RefUnwindSafe, T: RefUnwindSafe,

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impl<T, S> Send for TwoSiteStepResultBlockSparse<T, S>
where S: Send,

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impl<T, S> Sync for TwoSiteStepResultBlockSparse<T, S>
where S: Sync,

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impl<T, S> Unpin for TwoSiteStepResultBlockSparse<T, S>
where <T as Scalar>::Real: Unpin, S: Unpin,

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impl<T, S> UnsafeUnpin for TwoSiteStepResultBlockSparse<T, S>
where <T as Scalar>::Real: UnsafeUnpin, S: UnsafeUnpin,

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impl<T, S> UnwindSafe for TwoSiteStepResultBlockSparse<T, S>
where <T as Scalar>::Real: UnwindSafe, S: UnwindSafe, T: RefUnwindSafe,

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