Replaced `str` with `Path` (#1919)

* replaced str with Path

* minor change (Path to AsRef<Path>)

* fixed clippy lint

crates/burn-train/src/checkpoint/file.rs

@@ -1,3 +1,5 @@
+use std::path::{Path, PathBuf};
+
 use super::{Checkpointer, CheckpointerError};
 use burn_core::{
     record::{FileRecorder, Record},
@@ -6,7 +8,7 @@ use burn_core::{
 
 /// The file checkpointer.
 pub struct FileCheckpointer<FR> {
-    directory: String,
+    directory: PathBuf,
     name: String,
     recorder: FR,
 }
@@ -19,17 +21,19 @@ impl<FR> FileCheckpointer<FR> {
     /// * `recorder` - The file recorder.
     /// * `directory` - The directory to save the checkpoints.
     /// * `name` - The name of the checkpoint.
-    pub fn new(recorder: FR, directory: &str, name: &str) -> Self {
+    pub fn new(recorder: FR, directory: impl AsRef<Path>, name: &str) -> Self {
+        let directory = directory.as_ref();
         std::fs::create_dir_all(directory).ok();
 
         Self {
-            directory: directory.to_string(),
+            directory: directory.to_path_buf(),
             name: name.to_string(),
             recorder,
         }
     }
-    fn path_for_epoch(&self, epoch: usize) -> String {
-        format!("{}/{}-{}", self.directory, self.name, epoch)
+
+    fn path_for_epoch(&self, epoch: usize) -> PathBuf {
+        self.directory.join(format!("{}-{}", self.name, epoch))
     }
 }
 
@@ -41,10 +45,10 @@ where
 {
     fn save(&self, epoch: usize, record: R) -> Result<(), CheckpointerError> {
         let file_path = self.path_for_epoch(epoch);
-        log::info!("Saving checkpoint {} to {}", epoch, file_path);
+        log::info!("Saving checkpoint {} to {}", epoch, file_path.display());
 
         self.recorder
-            .record(record, file_path.into())
+            .record(record, file_path)
             .map_err(CheckpointerError::RecorderError)?;
 
         Ok(())
@@ -52,17 +56,25 @@ where
 
     fn restore(&self, epoch: usize, device: &B::Device) -> Result<R, CheckpointerError> {
         let file_path = self.path_for_epoch(epoch);
-        log::info!("Restoring checkpoint {} from {}", epoch, file_path);
+        log::info!(
+            "Restoring checkpoint {} from {}",
+            epoch,
+            file_path.display()
+        );
         let record = self
             .recorder
-            .load(file_path.into(), device)
+            .load(file_path, device)
             .map_err(CheckpointerError::RecorderError)?;
 
         Ok(record)
     }
 
     fn delete(&self, epoch: usize) -> Result<(), CheckpointerError> {
-        let file_to_remove = format!("{}.{}", self.path_for_epoch(epoch), FR::file_extension(),);
+        let file_to_remove = format!(
+            "{}.{}",
+            self.path_for_epoch(epoch).display(),
+            FR::file_extension(),
+        );
 
         if std::path::Path::new(&file_to_remove).exists() {
             log::info!("Removing checkpoint {}", file_to_remove);

crates/burn-train/src/learner/application_logger.rs

@@ -1,4 +1,4 @@
-use std::path::Path;
+use std::path::{Path, PathBuf};
 use tracing_core::{Level, LevelFilter};
 use tracing_subscriber::filter::filter_fn;
 use tracing_subscriber::prelude::*;
@@ -12,14 +12,14 @@ pub trait ApplicationLoggerInstaller {
 
 /// This struct is used to install a local file application logger to output logs to a given file path.
 pub struct FileApplicationLoggerInstaller {
-    path: String,
+    path: PathBuf,
 }
 
 impl FileApplicationLoggerInstaller {
     /// Create a new file application logger.
-    pub fn new(path: &str) -> Self {
+    pub fn new(path: impl AsRef<Path>) -> Self {
         Self {
-            path: path.to_string(),
+            path: path.as_ref().to_path_buf(),
         }
     }
 }
@@ -29,8 +29,9 @@ impl ApplicationLoggerInstaller for FileApplicationLoggerInstaller {
         let path = Path::new(&self.path);
         let writer = tracing_appender::rolling::never(
             path.parent().unwrap_or_else(|| Path::new(".")),
-            path.file_name()
-                .unwrap_or_else(|| panic!("The path '{}' to point to a file.", self.path)),
+            path.file_name().unwrap_or_else(|| {
+                panic!("The path '{}' to point to a file.", self.path.display())
+            }),
         );
         let layer = tracing_subscriber::fmt::layer()
             .with_ansi(false)
@@ -51,13 +52,14 @@ impl ApplicationLoggerInstaller for FileApplicationLoggerInstaller {
         }
 
         let hook = std::panic::take_hook();
-        let file_path: String = self.path.to_owned();
+        let file_path = self.path.to_owned();
 
         std::panic::set_hook(Box::new(move |info| {
             log::error!("PANIC => {}", info.to_string());
             eprintln!(
                 "=== PANIC ===\nA fatal error happened, you can check the experiment logs here => \
-                    '{file_path}'\n============="
+                    '{}'\n=============",
+                file_path.display()
             );
             hook(info);
         }));

crates/burn-train/src/learner/builder.rs

@@ -1,4 +1,5 @@
 use std::collections::HashSet;
+use std::path::{Path, PathBuf};
 use std::rc::Rc;
 
 use super::Learner;
@@ -45,7 +46,7 @@ where
     )>,
     num_epochs: usize,
     checkpoint: Option<usize>,
-    directory: String,
+    directory: PathBuf,
     grad_accumulation: Option<usize>,
     devices: Vec<B::Device>,
     renderer: Option<Box<dyn MetricsRenderer + 'static>>,
@@ -74,12 +75,14 @@ where
     /// # Arguments
     ///
     /// * `directory` - The directory to save the checkpoints.
-    pub fn new(directory: &str) -> Self {
+    pub fn new(directory: impl AsRef<Path>) -> Self {
+        let directory = directory.as_ref().to_path_buf();
+        let experiment_log_file = directory.join("experiment.log");
         Self {
             num_epochs: 1,
             checkpoint: None,
             checkpointers: None,
-            directory: directory.to_string(),
+            directory,
             grad_accumulation: None,
             devices: vec![B::Device::default()],
             metrics: Metrics::default(),
@@ -87,7 +90,7 @@ where
             renderer: None,
             interrupter: TrainingInterrupter::new(),
             tracing_logger: Some(Box::new(FileApplicationLoggerInstaller::new(
-                format!("{}/experiment.log", directory).as_str(),
+                experiment_log_file,
             ))),
             num_loggers: 0,
             checkpointer_strategy: Box::new(
@@ -256,21 +259,12 @@ where
         M::Record: 'static,
         S::Record: 'static,
     {
-        let checkpointer_model = FileCheckpointer::new(
-            recorder.clone(),
-            format!("{}/checkpoint", self.directory).as_str(),
-            "model",
-        );
-        let checkpointer_optimizer = FileCheckpointer::new(
-            recorder.clone(),
-            format!("{}/checkpoint", self.directory).as_str(),
-            "optim",
-        );
-        let checkpointer_scheduler: FileCheckpointer<FR> = FileCheckpointer::new(
-            recorder,
-            format!("{}/checkpoint", self.directory).as_str(),
-            "scheduler",
-        );
+        let checkpoint_dir = self.directory.join("checkpoint");
+        let checkpointer_model = FileCheckpointer::new(recorder.clone(), &checkpoint_dir, "model");
+        let checkpointer_optimizer =
+            FileCheckpointer::new(recorder.clone(), &checkpoint_dir, "optim");
+        let checkpointer_scheduler: FileCheckpointer<FR> =
+            FileCheckpointer::new(recorder, &checkpoint_dir, "scheduler");
 
         self.checkpointers = Some((
             AsyncCheckpointer::new(checkpointer_model),
@@ -325,17 +319,12 @@ where
         let renderer = self.renderer.unwrap_or_else(|| {
             Box::new(default_renderer(self.interrupter.clone(), self.checkpoint))
         });
-        let directory = &self.directory;
 
         if self.num_loggers == 0 {
             self.event_store
-                .register_logger_train(FileMetricLogger::new(
-                    format!("{directory}/train").as_str(),
-                ));
+                .register_logger_train(FileMetricLogger::new(self.directory.join("train")));
             self.event_store
-                .register_logger_valid(FileMetricLogger::new(
-                    format!("{directory}/valid").as_str(),
-                ));
+                .register_logger_valid(FileMetricLogger::new(self.directory.join("valid")));
         }
 
         let event_store = Rc::new(EventStoreClient::new(self.event_store));

crates/burn-train/src/learner/summary.rs

@@ -1,5 +1,8 @@
 use core::cmp::Ordering;
-use std::{fmt::Display, path::Path};
+use std::{
+    fmt::Display,
+    path::{Path, PathBuf},
+};
 
 use crate::{
     logger::FileMetricLogger,
@@ -73,16 +76,20 @@ impl LearnerSummary {
     ///
     /// * `directory` - The directory containing the training artifacts (checkpoints and logs).
     /// * `metrics` - The list of metrics to collect for the summary.
-    pub fn new<S: AsRef<str>>(directory: &str, metrics: &[S]) -> Result<Self, String> {
-        let directory_path = Path::new(directory);
-        if !directory_path.exists() {
-            return Err(format!("Artifact directory does not exist at: {directory}"));
+    pub fn new<S: AsRef<str>>(directory: impl AsRef<Path>, metrics: &[S]) -> Result<Self, String> {
+        let directory = directory.as_ref();
+        if !directory.exists() {
+            return Err(format!(
+                "Artifact directory does not exist at: {}",
+                directory.display()
+            ));
         }
-        let train_dir = directory_path.join("train");
-        let valid_dir = directory_path.join("valid");
+        let train_dir = directory.join("train");
+        let valid_dir = directory.join("valid");
         if !train_dir.exists() & !valid_dir.exists() {
             return Err(format!(
-                "No training or validation artifacts found at: {directory}"
+                "No training or validation artifacts found at: {}",
+                directory.display()
             ));
         }
 
@@ -219,7 +226,7 @@ impl Display for LearnerSummary {
 }
 
 pub(crate) struct LearnerSummaryConfig {
-    pub(crate) directory: String,
+    pub(crate) directory: PathBuf,
     pub(crate) metrics: Vec<String>,
 }
 

crates/burn-train/src/logger/file.rs

@@ -1,5 +1,5 @@
 use super::Logger;
-use std::{fs::File, io::Write};
+use std::{fs::File, io::Write, path::Path};
 
 /// File logger.
 pub struct FileLogger {
@@ -16,14 +16,21 @@ impl FileLogger {
     /// # Returns
     ///
     /// The file logger.
-    pub fn new(path: &str) -> Self {
+    pub fn new(path: impl AsRef<Path>) -> Self {
+        let path = path.as_ref();
         let mut options = std::fs::File::options();
         let file = options
             .write(true)
             .truncate(true)
             .create(true)
             .open(path)
-            .unwrap_or_else(|err| panic!("Should be able to create the new file '{path}': {err}"));
+            .unwrap_or_else(|err| {
+                panic!(
+                    "Should be able to create the new file '{}': {}",
+                    path.display(),
+                    err
+                )
+            });
 
         Self { file }
     }

crates/burn-train/src/logger/metric.rs

@@ -1,6 +1,10 @@
 use super::{AsyncLogger, FileLogger, InMemoryLogger, Logger};
 use crate::metric::{MetricEntry, NumericEntry};
-use std::{collections::HashMap, fs};
+use std::{
+    collections::HashMap,
+    fs,
+    path::{Path, PathBuf},
+};
 
 const EPOCH_PREFIX: &str = "epoch-";
 
@@ -27,7 +31,7 @@ pub trait MetricLogger: Send {
 /// The file metric logger.
 pub struct FileMetricLogger {
     loggers: HashMap<String, AsyncLogger<String>>,
-    directory: String,
+    directory: PathBuf,
     epoch: usize,
 }
 
@@ -41,10 +45,10 @@ impl FileMetricLogger {
     /// # Returns
     ///
     /// The file metric logger.
-    pub fn new(directory: &str) -> Self {
+    pub fn new(directory: impl AsRef<Path>) -> Self {
         Self {
             loggers: HashMap::new(),
-            directory: directory.to_string(),
+            directory: directory.as_ref().to_path_buf(),
             epoch: 1,
         }
     }
@@ -76,15 +80,18 @@ impl FileMetricLogger {
         max_epoch
     }
 
-    fn epoch_directory(&self, epoch: usize) -> String {
-        format!("{}/{}{}", self.directory, EPOCH_PREFIX, epoch)
+    fn epoch_directory(&self, epoch: usize) -> PathBuf {
+        let name = format!("{}{}", EPOCH_PREFIX, epoch);
+        self.directory.join(name)
     }
-    fn file_path(&self, name: &str, epoch: usize) -> String {
+
+    fn file_path(&self, name: &str, epoch: usize) -> PathBuf {
         let directory = self.epoch_directory(epoch);
         let name = name.replace(' ', "_");
-
-        format!("{directory}/{name}.log")
+        let name = format!("{name}.log");
+        directory.join(name)
     }
+
     fn create_directory(&self, epoch: usize) {
         let directory = self.epoch_directory(epoch);
         std::fs::create_dir_all(directory).ok();
@@ -102,7 +109,7 @@ impl MetricLogger for FileMetricLogger {
                 self.create_directory(self.epoch);
 
                 let file_path = self.file_path(key, self.epoch);
-                let logger = FileLogger::new(&file_path);
+                let logger = FileLogger::new(file_path);
                 let logger = AsyncLogger::new(logger);
 
                 self.loggers.insert(key.clone(), logger);