Enum BidiSchedule 

pub enum BidiSchedule {
    StridedCyclic,
    StridedStretched,
    SymmetricCyclic,
    SymmetricStretched,
    Custom(Vec<usize>),
}

How a bidirectional layer stack maps virtual layer indices to real layer indices, interleaving the straight (→, even indices) and reverse (←, odd indices) directions.

Variants

StridedCyclic

Use even virtual positions for straight-direction (→), and odd virtual positions for reverse-direction (←), wrapping around for each schedule.

Example

• virtual len = 10, real len = 4:
  → ← → ← → ← → ← → ←
[(0⇒0, 1⇒1), (2⇒2, 3⇒3)], [(4⇒0, 5⇒1), (6⇒2, 7⇒3)], [(8⇒0, 9⇒1), (...)]

StridedStretched

Use even virtual positions for straight-direction (→), and odd virtual positions for reverse-direction (←), stretching for each schedule.

Example

• virtual len = 10, real len = 4:
  → ← → ← → ← → ← → ←
[(0⇒0, 1⇒1), (2⇒0, 3⇒1), (4⇒0, 5⇒1)], [(6⇒2, 7⇒3), (8⇒2, 9⇒3), (...)]

SymmetricCyclic

Fills virtual positions by wrapping around the real schedule in a looping fashion, replicating between the straight (→) and reverse (←) directions.

Example

• virtual len = 10, real len = 4:
  → ← → ← → ← → ← → ←
[(0⇒0, 1⇒0), (2⇒1, 3⇒1), (4⇒2, 5⇒2), (6⇒3, 7⇒3)], [(8⇒0, 9⇒0), (...)]

SymmetricStretched

Fills virtual positions by stretching the real schedule, replicating between the straight (→) and reverse (←) directions.

Example

• virtual len = 10, real len = 4:
  → ← → ← → ← → ← → ←
[(0⇒0, 1⇒0), (2⇒0, 3⇒0)],[(4⇒1, 5⇒1), (...)], [(6⇒2, 7⇒2)], [(8⇒3, 9⇒3)]

Custom(Vec<usize>)

Fills virtual positions by referring to the index vector.

Example

• virtual len = 10, real len = 4, custom = [0, 1, 2, 2, 1, 0, 0, 0, 3, 2]:
  → ← → ← → ← → ← → ←
[(0⇒0, 1⇒1)], [(2⇒2, 3⇒2)], [(4⇒1, 5⇒0)], [(6⇒0, 7⇒0)], [(8⇒3, 9⇒2)], [(...)]

Implementations

impl BidiSchedule

pub fn real_idx( &self, virtual_idx: usize, virtual_len: usize, real_len: usize, ) -> usize

Map virtual_idx (in 0..virtual_len) to a real layer index in 0..real_len. Even/odd virtual_idx selects the straight/reverse direction; the outer index virtual_idx / 2 is what the schedule cycles or stretches over.

Trait Implementations

impl Clone for BidiSchedule

fn clone(&self) -> BidiSchedule

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for BidiSchedule

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for BidiSchedule

fn default() -> BidiSchedule

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for BidiSchedule

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for BidiSchedule

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.