Trait Operator 

pub trait Operator<T, V>
where
    T: TensorLike,
    V: Clone + Hash + Eq + Send + Sync + Debug,
{
    // Required methods
    fn site_indices(&self) -> HashSet<T::Index>;
    fn site_index_network(&self) -> &SiteIndexNetwork<V, T::Index>;

    // Provided method
    fn node_names(&self) -> HashSet<V> { ... }
}

Trait for operators that can act on tensor network states.

An operator has:

• A set of site indices it acts on
• A site index network describing its structure

This trait is used for composing multiple operators into a single operator and for validating operator compatibility.

Type Parameters

• T: Tensor type implementing TensorLike
• V: Node name type

Required Methods

fn site_indices(&self) -> HashSet<T::Index>

Get all site indices this operator acts on.

Returns the union of site indices across all nodes.

fn site_index_network(&self) -> &SiteIndexNetwork<V, T::Index>

Get the site index network describing this operator’s structure.

The site index network contains:

• Topology: which nodes connect to which
• Site space: which site indices belong to each node

Provided Methods

fn node_names(&self) -> HashSet<V>

Get the set of node names this operator covers.

Default implementation extracts node names from the site index network.

Implementors

impl<T, V> Operator<T, V> for TreeTN<T, V>

where T: TensorLike, T::Index: IndexLike + Clone + Hash + Eq, V: Clone + Hash + Eq + Send + Sync + Debug,

impl<T, V> Operator<T, V> for LinearOperator<T, V>

where T: TensorLike, T::Index: IndexLike + Clone + Hash + Eq, V: Clone + Hash + Eq + Send + Sync + Debug,