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extern crate image;
extern crate itertools;
extern crate rand;
extern crate rayon;
extern crate regex;
extern crate walkdir;
pub struct CifarDataset {
pub labels: Vec<String>,
pub train_count: usize,
pub test_count: usize,
pub train_dataset: Vec<super::CifarImage>,
pub test_dataset: Vec<super::CifarImage>,
}
struct CifarFilePaths {
meta_data_paths: Vec<::std::path::PathBuf>,
train_data_paths: Vec<::std::path::PathBuf>,
test_data_paths: Vec<::std::path::PathBuf>,
}
impl CifarDataset {
pub fn new<P: AsRef<::std::path::Path>>(path: P) -> Result<Self, String> {
use std::thread::spawn;
let CifarFilePaths {
meta_data_paths,
train_data_paths,
test_data_paths,
} = CifarDataset::get_file_paths(path)?;
let meta_data_handle = spawn(move || CifarDataset::get_meta_data(&meta_data_paths));
let train_images_handle = spawn(move || {
CifarDataset::get_images(CifarDataset::get_byte_datas(&train_data_paths)?)
});
let test_images_handle = spawn(move || {
CifarDataset::get_images(CifarDataset::get_byte_datas(&test_data_paths)?)
});
let labels = CifarDataset::for_cifardataset_join_thread(meta_data_handle)?;
let train_images = CifarDataset::for_cifardataset_join_thread(train_images_handle)?;
let test_images = CifarDataset::for_cifardataset_join_thread(test_images_handle)?;
let cifar_dataset = CifarDataset {
labels: labels,
train_count: train_images.len() as usize,
train_dataset: train_images,
test_count: test_images.len() as usize,
test_dataset: test_images,
};
Ok(cifar_dataset)
}
fn for_cifardataset_join_thread<T>(
p: ::std::thread::JoinHandle<Result<T, ::std::io::Error>>,
) -> Result<T, String> {
p.join()
.map(|content| content.map_err(|err| err.to_string()))
.map_err(|_| "thread panicked".to_string())?
}
fn get_file_paths<P: AsRef<::std::path::Path>>(path: P) -> Result<CifarFilePaths, String> {
use self::regex::Regex;
let paths = &walkdir::WalkDir::new(path)
.into_iter()
.flat_map(|x| x.map(|x| x.path().to_path_buf()))
.filter(|x| x.is_file())
.collect::<Vec<::std::path::PathBuf>>();
let train_data_path_re = Regex::new("data_batch_[1-5].bin").map_err(|err| err.to_string())?;
let test_data_path_re = Regex::new("test_batch.bin").map_err(|err| err.to_string())?;
let cifar_file_paths = CifarFilePaths {
meta_data_paths: CifarDataset::get_meta_data_paths(paths)?,
train_data_paths: CifarDataset::get_paths_regex(paths, &train_data_path_re)?,
test_data_paths: CifarDataset::get_paths_regex(paths, &test_data_path_re)?,
};
Ok(cifar_file_paths)
}
fn get_meta_data_paths(
paths: &[::std::path::PathBuf],
) -> Result<Vec<::std::path::PathBuf>, String> {
use self::rayon::prelude::*;
use std::path::{Path, PathBuf};
let meta_data_file_name = Path::new("batches.meta.txt");
let fpaths: Vec<PathBuf> = paths
.into_par_iter()
.filter(|path| {
path.file_name()
.map(|file_name| file_name == meta_data_file_name)
.unwrap_or(false)
})
.cloned()
.collect();
if fpaths.is_empty() {
Err("Can't Find Meta Data Files!!".to_string())
} else {
Ok(fpaths)
}
}
fn get_paths_regex(
paths: &[::std::path::PathBuf],
re: &self::regex::Regex,
) -> Result<Vec<::std::path::PathBuf>, String> {
use self::rayon::prelude::*;
use std::path::PathBuf;
let fpaths: Vec<PathBuf> = paths
.par_iter()
.filter(|path| {
path.file_name()
.map(|file_name| {
let file_name = file_name.to_string_lossy();
re.is_match(file_name.as_ref())
})
.unwrap_or(false)
})
.cloned()
.collect();
if fpaths.is_empty() {
Err("Can't Find Train Data Files!!".to_string())
} else {
Ok(fpaths)
}
}
fn get_meta_data(paths: &[::std::path::PathBuf]) -> Result<Vec<String>, ::std::io::Error> {
use std::io::Read;
use self::itertools::Itertools;
paths
.iter()
.map(|meta_path| -> Result<String, ::std::io::Error> {
::std::fs::File::open(meta_path).and_then(|mut file| {
let mut contents = String::new();
file.read_to_string(&mut contents).map(|_| contents)
})
})
.map(|lines| -> Result<Vec<String>, ::std::io::Error> {
lines.map(|l| -> Vec<String> {
l.lines()
.filter(|x| !x.is_empty())
.map(|x| x.into())
.collect_vec()
})
})
.collect::<Result<Vec<Vec<String>>, ::std::io::Error>>()
.map(|v| v.concat())
}
fn get_byte_datas(paths: &[::std::path::PathBuf]) -> Result<Vec<Vec<u8>>, ::std::io::Error> {
use std::io::{BufReader, Read};
use self::itertools::Itertools;
use self::rayon::prelude::*;
paths
.par_iter()
.map(|file_path| -> Result<Vec<u8>, ::std::io::Error> {
::std::fs::File::open(file_path).and_then(|file| {
let mut byte_data: Vec<u8> = Vec::new();
BufReader::new(file)
.read_to_end(&mut byte_data)
.map(|_| byte_data)
})
})
.map(|byte_data| -> Result<Vec<Vec<u8>>, ::std::io::Error> {
byte_data.map(|b| -> Vec<Vec<u8>> {
b.chunks(3073)
.map(|byte_img| -> Vec<u8> { byte_img.to_vec() })
.collect_vec()
})
})
.collect::<Result<Vec<Vec<Vec<u8>>>, ::std::io::Error>>()
.map(|v| v.concat())
}
fn get_images(byte_datas: Vec<Vec<u8>>) -> Result<Vec<super::CifarImage>, ::std::io::Error> {
use self::rayon::prelude::*;
byte_datas
.into_par_iter()
.map(|byte_img| {
use super::CifarImageTrait;
super::CifarImage::new(&byte_img)
})
.collect::<Result<Vec<super::CifarImage>, ::std::io::Error>>()
}
}