Struct Variable 

pub struct Variable {
    pub id: VariableId,
    pub value: f64,
    pub gradient: f64,
    pub node: Option<Arc<ComputationNode>>,
}

Variable for reverse-mode automatic differentiation

Fields

id: VariableId

Unique variable identifier

value: f64

Current value

gradient: f64

Gradient (populated during backpropagation)

node: Option<Arc<ComputationNode>>

Computation graph node

Implementations

impl Variable

pub fn new(value: f64) -> Self

Create a new variable

pub fn with_graph(value: f64, tape: Arc<Mutex<ComputationTape>>) -> Self

Create a variable with computation graph tracking

pub fn set_gradient(&mut self, gradient: f64)

Set gradient value

pub fn add_gradient(&mut self, gradient: f64)

Add to gradient (for accumulation)

pub fn zero_gradient(&mut self)

Reset gradient to zero

Trait Implementations

impl Clone for Variable

fn clone(&self) -> Variable

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Variable

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

Formats the value using the given formatter.