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use crate::{ArgminError, Error};
use serde::de::DeserializeOwned;
use serde::{Deserialize, Serialize};
use std::default::Default;
use std::fmt::Display;
use std::fs::File;
use std::io::{BufReader, BufWriter};
use std::path::Path;
#[derive(Clone, Serialize, Deserialize, Eq, PartialEq, Ord, PartialOrd, Debug, Hash, Copy)]
pub enum CheckpointMode {
Never,
Every(u64),
Always,
}
impl Default for CheckpointMode {
fn default() -> CheckpointMode {
CheckpointMode::Never
}
}
impl Display for CheckpointMode {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
match *self {
CheckpointMode::Never => write!(f, "Never"),
CheckpointMode::Every(i) => write!(f, "Every({})", i),
CheckpointMode::Always => write!(f, "Always"),
}
}
}
#[derive(Clone, Serialize, Deserialize, Eq, PartialEq, Ord, PartialOrd, Debug, Hash)]
pub struct ArgminCheckpoint {
mode: CheckpointMode,
directory: String,
name: String,
}
impl Default for ArgminCheckpoint {
fn default() -> ArgminCheckpoint {
ArgminCheckpoint {
mode: CheckpointMode::Never,
directory: ".checkpoints".to_string(),
name: "default".to_string(),
}
}
}
impl ArgminCheckpoint {
pub fn new(directory: &str, mode: CheckpointMode) -> Result<Self, Error> {
match mode {
CheckpointMode::Every(_) | CheckpointMode::Always => {
std::fs::create_dir_all(&directory)?
}
_ => {}
}
let name = "solver".to_string();
let directory = directory.to_string();
Ok(ArgminCheckpoint {
mode,
directory,
name,
})
}
#[inline]
pub fn set_dir(&mut self, dir: &str) {
self.directory = dir.to_string();
}
#[inline]
pub fn dir(&self) -> String {
self.directory.clone()
}
#[inline]
pub fn set_name(&mut self, name: &str) {
self.name = name.to_string();
}
#[inline]
pub fn name(&self) -> String {
self.name.clone()
}
#[inline]
pub fn set_mode(&mut self, mode: CheckpointMode) {
self.mode = mode
}
#[inline]
pub fn store<T: Serialize>(&self, solver: &T, filename: String) -> Result<(), Error> {
let dir = Path::new(&self.directory);
if !dir.exists() {
std::fs::create_dir_all(&dir)?
}
let fname = dir.join(Path::new(&filename));
let f = BufWriter::new(File::create(fname)?);
bincode::serialize_into(f, solver)?;
Ok(())
}
#[inline]
pub fn store_cond<T: Serialize>(&self, solver: &T, iter: u64) -> Result<(), Error> {
let mut filename = self.name();
filename.push_str(".arg");
match self.mode {
CheckpointMode::Always => self.store(solver, filename)?,
CheckpointMode::Every(it) if iter % it == 0 => self.store(solver, filename)?,
CheckpointMode::Never | CheckpointMode::Every(_) => {}
};
Ok(())
}
}
pub fn load_checkpoint<T: DeserializeOwned, P: AsRef<Path>>(path: P) -> Result<T, Error> {
let path = path.as_ref();
if !path.exists() {
return Err(ArgminError::CheckpointNotFound {
text: path.to_str().unwrap().to_string(),
}
.into());
}
let file = File::open(path)?;
let reader = BufReader::new(file);
Ok(bincode::deserialize_from(reader)?)
}
#[cfg(test)]
mod tests {
use super::*;
use crate::nooperator::MinimalNoOperator;
use crate::*;
#[derive(Serialize, Deserialize, Clone, Debug)]
pub struct PhonySolver {}
impl PhonySolver {
pub fn new() -> Self {
PhonySolver {}
}
}
impl<O> Solver<O> for PhonySolver
where
O: ArgminOp,
{
fn next_iter(
&mut self,
_op: &mut OpWrapper<O>,
_state: &IterState<O>,
) -> Result<ArgminIterData<O>, Error> {
unimplemented!()
}
}
#[test]
fn test_store() {
let op: MinimalNoOperator = MinimalNoOperator::new();
let solver = PhonySolver::new();
let exec = Executor::new(op, solver, vec![0.0f64, 0.0]);
let check = ArgminCheckpoint::new("checkpoints", CheckpointMode::Always).unwrap();
check.store_cond(&exec, 20).unwrap();
let _loaded: Executor<MinimalNoOperator, PhonySolver> =
load_checkpoint("checkpoints/solver.arg").unwrap();
}
}