Struct Var 

pub struct Var<'t> { /* private fields */ }

A differentiable value: a Copy handle carrying its numeric value and its position on the Tape.

Implementations

impl<'t> Var<'t>

pub fn value(&self) -> f64

The current numeric value.

pub fn backward(&self) -> Grad

Reverse pass seeded at self: returns ∂self/∂· for every node. Cost is O(#nodes), one linear sweep.

pub fn sin(self) -> Var<'t>

Sine (d/dx sin x = cos x).

pub fn cos(self) -> Var<'t>

Cosine (d/dx cos x = −sin x).

pub fn exp(self) -> Var<'t>

Exponential (d/dx eˣ = eˣ).

pub fn ln(self) -> Var<'t>

Natural log (d/dx ln x = 1/x).

pub fn tanh(self) -> Var<'t>

Hyperbolic tangent (d/dx tanh x = 1 − tanh²x) — the workhorse network activation.

pub fn sqrt(self) -> Var<'t>

Square root (d/dx √x = 1/(2√x)).

pub fn powf(self, n: f64) -> Var<'t>

Integer/real power (d/dx xⁿ = n·xⁿ⁻¹).

pub fn sigmoid(self) -> Var<'t>

Logistic sigmoid σ(x) = 1/(1+e⁻ˣ) (σ' = σ(1−σ)).

pub fn relu(self) -> Var<'t>

Rectified linear unit (ReLU' = [x>0]).

Trait Implementations

impl<'t> Add for Var<'t>

type Output = Var<'t>

The resulting type after applying the + operator.

fn add(self, rhs: Var<'t>) -> Var<'t>

Performs the + operation.

impl<'t> Add<f64> for Var<'t>

type Output = Var<'t>

The resulting type after applying the + operator.

fn add(self, rhs: f64) -> Var<'t>

Performs the + operation.

impl<'t> Clone for Var<'t>

fn clone(&self) -> Var<'t>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'t> Copy for Var<'t>

impl<'t> Div for Var<'t>

type Output = Var<'t>

The resulting type after applying the / operator.

fn div(self, rhs: Var<'t>) -> Var<'t>

Performs the / operation.

impl<'t> Mul for Var<'t>

type Output = Var<'t>

The resulting type after applying the * operator.

fn mul(self, rhs: Var<'t>) -> Var<'t>

Performs the * operation.

impl<'t> Mul<f64> for Var<'t>

type Output = Var<'t>

The resulting type after applying the * operator.

fn mul(self, rhs: f64) -> Var<'t>

Performs the * operation.

impl<'t> Neg for Var<'t>

type Output = Var<'t>

The resulting type after applying the - operator.

fn neg(self) -> Var<'t>

Performs the unary - operation.

impl<'t> Sub for Var<'t>

type Output = Var<'t>

The resulting type after applying the - operator.

fn sub(self, rhs: Var<'t>) -> Var<'t>

Performs the - operation.

impl<'t> Sub<f64> for Var<'t>

type Output = Var<'t>

The resulting type after applying the - operator.

fn sub(self, rhs: f64) -> Var<'t>

Performs the - operation.