function (tt::TTCache{V})(
leftindexset::AbstractVector{MultiIndex},
rightindexset::AbstractVector{MultiIndex},
::Val{M}
)::Array{V,M + 2} where {V,M}
In batch evaluation, we may want to project some of the M central site indices to fixed values.
The returned tensor will have size-1 site indices for these projected site indices.
In batch evaluation, we may want to project some of the
M
central site indices to fixed values. The returned tensor will have size-1 site indices for these projected site indices.