Class TensorNetworkV2::Edge

• Defined in File tensor_network_v2.hpp

Nested Relationships

This class is a nested type of Class TensorNetworkV2.

Class Documentation

class Edge

Edge in a TensorNetworkV2 = the Index annotating it + a pair of indices to identify which Tensor terminals it’s connected to.

Note

tensor terminals in a sequence of tensors are indexed as follows:

• >0 for bra terminals (i.e. “+7” indicated connection to a bra terminal of 7th tensor object in the sequence)

• <0 for ket terminals

• 0 if free (not attached to any tensor objects)

• position records the terminal’s location in the sequence of bra/ket terminals (always 0 for symmetric/antisymmetric tensors) Terminal indices are sorted by the tensor index (i.e. by the absolute value of the terminal index), followed by position

Public Functions

Edge() = default

inline explicit Edge(Vertex vertex)

inline Edge(Vertex vertex, Index index)

inline Edge &connect_to(Vertex vertex)

inline bool operator<(const Edge &other) const

inline bool operator==(const Edge &other) const

inline const Vertex &first_vertex() const

inline const Vertex &second_vertex() const

inline std::size_t vertex_count() const

Returns:

the number of attached terminals (0, 1, or 2)

inline const Index &idx() const