1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160

// Copyright 2018 Stefan Kroboth
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
// http://opensource.org/licenses/MIT>, at your option. This file may not be
// copied, modified, or distributed except according to those terms.

use crate::Error;
use serde::de::DeserializeOwned;
use serde::{Deserialize, Serialize};
use std::default::Default;
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
    }
}

#[derive(Clone, Serialize, Deserialize, Eq, PartialEq, Ord, PartialOrd, Debug, Hash)]
pub struct ArgminCheckpoint {
    mode: CheckpointMode,
    directory: String,
    prefix: String,
}

impl Default for ArgminCheckpoint {
    fn default() -> ArgminCheckpoint {
        let out = ArgminCheckpoint::new("checkpoints", CheckpointMode::default());
        match out {
            Ok(cp) => cp,
            Err(_) => panic!("Cannot create default ArgminCheckpoint."),
        }
    }
}

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 prefix = "solver".to_string();
        let directory = directory.to_string();
        Ok(ArgminCheckpoint {
            mode,
            directory,
            prefix,
        })
    }

    #[inline]
    pub fn dir(&self) -> String {
        self.directory.clone()
    }

    #[inline]
    pub fn set_prefix(&mut self, prefix: &str) {
        self.prefix = prefix.to_string();
    }

    #[inline]
    pub fn prefix(&self) -> String {
        self.prefix.clone()
    }

    #[inline]
    pub fn store<T: Serialize>(&self, solver: &T) -> Result<(), Error> {
        let mut filename = self.prefix();
        filename.push_str(".arg");
        let dir = Path::new(&self.directory).join(Path::new(&filename));
        let f = BufWriter::new(File::create(dir)?);
        // serde_json::to_writer_pretty(f, solver)?;
        bincode::serialize_into(f, solver)?;
        // serde_json::to_string_pretty(self).unwrap()
        Ok(())
    }

    #[inline]
    pub fn store_cond<T: Serialize>(&self, solver: &T, iter: u64) -> Result<(), Error> {
        match self.mode {
            CheckpointMode::Always => self.store(solver)?,
            CheckpointMode::Every(it) if iter % it == 0 => self.store(solver)?,
            CheckpointMode::Never | CheckpointMode::Every(_) => {}
        };
        Ok(())
    }
}

pub fn load_checkpoint<T: DeserializeOwned, P: AsRef<Path>>(path: P) -> Result<T, Error> {
    let file = File::open(path)?;
    let reader = BufReader::new(file);
    // Ok(serde_json::from_reader(reader)?)
    Ok(bincode::deserialize_from(reader)?)
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::nooperator::MinimalNoOperator;
    use crate::*;
    use argmin_codegen::ArgminSolver;
    // use std::fmt::Debug;

    #[derive(ArgminSolver, Serialize, Deserialize, Clone, Debug)]
    pub struct PhonySolver<O>
    where
        O: ArgminOp,
    {
        base: ArgminBase<O>,
    }

    impl<O> PhonySolver<O>
    where
        O: ArgminOp,
    {
        /// Constructor
        pub fn new(op: O, init_param: <O as ArgminOp>::Param) -> Self {
            PhonySolver {
                base: ArgminBase::new(op, init_param),
            }
        }
    }

    impl<O> ArgminIter for PhonySolver<O>
    where
        O: ArgminOp,
    {
        type Param = <O as ArgminOp>::Param;
        type Output = <O as ArgminOp>::Output;
        type Hessian = <O as ArgminOp>::Hessian;

        fn next_iter(&mut self) -> Result<ArgminIterData<Self::Param>, Error> {
            unimplemented!()
        }
    }

    #[test]
    fn test_store() {
        let op: MinimalNoOperator = MinimalNoOperator::new();
        let solver = PhonySolver::new(op, vec![0.0, 0.0]);
        let check = ArgminCheckpoint::new("checkpoints", CheckpointMode::Always).unwrap();
        check.store_cond(&solver, 20).unwrap();

        let loaded: PhonySolver<MinimalNoOperator> =
            load_checkpoint("checkpoints/solver.arg").unwrap();
        println!("{:?}", loaded);
    }
}