Struct MetricsLogger 

pub struct MetricsLogger { /* private fields */ }

Logs training metrics to a CSV file and prints a summary line to stdout.

Creates a CSV file at the specified path with columns: epoch,train_loss,val_loss,learning_rate,duration_ms

On each on_epoch_end, appends a row with the current metrics and prints a formatted summary to stdout.

Implementations

impl MetricsLogger

pub fn new(path: impl Into<PathBuf>) -> Self

Create a new metrics logger that writes CSV rows to path.

pub fn path(&self) -> &Path

Returns the path of the CSV file.

Trait Implementations

impl TrainingCallback for MetricsLogger

fn on_epoch_end(&mut self, epoch: usize, metrics: &HashMap<String, f32>) -> bool

Called after each epoch. Returns true if training should stop.

fn on_batch_end(&mut self, _epoch: usize, _batch: usize, _loss: f32)

Called after each batch within an epoch. Default implementation does nothing.