fixed multihtreading benchmark missing
removed default code from lib.rs removed println statements from image_loader added image loading feature to database
This commit is contained in:
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@ -1,350 +1,179 @@
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//! This module provides the functionality to create thread pool to execute tasks in parallel.
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//! The amount of threads to be used at maximum can be regulated by using `ThreadPool::with_limit`.
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//! This implementation is aimed to be of low runtime cost with minimal sychronisation due to blocking.
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//! Note that no threads will be spawned until jobs are supplied to be executed. For every supplied job
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//! a new thread will be launched until the maximum number is reached. By then every launched thread will
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//! be reused to process the remaining elements of the queue. If no jobs are left to be executed
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//! all threads will finish and die. This means that if nothing is done, no threads will run in idle in the background.
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//! # Example
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//! ```rust
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//! # use imsearch::multithreading::ThreadPool;
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//! # use imsearch::multithreading::Task;
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//! let mut pool = ThreadPool::with_limit(2);
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//!
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//! for i in 0..10 {
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//! pool.enqueue(Task::new(i, |i| i));
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//! // ^^^^^^ closure or static function
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//! }
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//!
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//! pool.join_all();
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//! assert_eq!(pool.get_results().iter().sum::<i32>(), 45);
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//! ```
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//! Benachmarking funcitonality for [Criterion.rs](https://github.com/bheisler/criterion.rs)
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//! This benchmark will compare the performance of various thread pools launched with different amounts of
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//! maximum threads.
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//! Each thread will calculate a partial dot product of two different vectors composed of 1,000,000 64-bit
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//! double precision floating point values.
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use std::{
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any::Any,
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collections::VecDeque,
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num::NonZeroUsize,
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sync::{
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mpsc::{channel, Receiver, Sender},
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Arc, Mutex,
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use std::sync::Arc;
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use criterion::{black_box, criterion_group, criterion_main, BenchmarkId, Criterion, Throughput};
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use imsearch::multithreading::{Task, ThreadPool};
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/// Amount of elements per vector used to calculate the dot product
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const VEC_ELEM_COUNT: usize = 1_000_000;
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/// Number of threads to test
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const THREAD_COUNTS: [usize; 17] = [
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1, 2, 4, 6, 8, 10, 12, 16, 18, 20, 22, 26, 28, 32, 40, 56, 64,
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];
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/// seeds used to scramble up the values produced by the hash function for each vector
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/// these are just some pseudo random numbers
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const VEC_SEEDS: [u64; 2] = [0xa3f8347abce16, 0xa273048ca9dea];
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/// Compute the dot product of two vectors
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/// # Panics
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/// this function assumes both vectors to be of exactly the same length.
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/// If this is not the case the function will panic.
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fn dot(a: &[f64], b: &[f64]) -> f64 {
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let mut sum = 0.0;
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for i in 0..a.len() {
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sum += a[i] * b[i];
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}
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sum
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}
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/// Computes the dot product using a thread pool with varying number of threads. The vectors will be both splitted into equally
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/// sized slices which then get passed ot their own thread to compute the partial dot product. After all threads have
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/// finished the partial dot products will be summed to create the final result.
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fn dot_parallel(a: Arc<Vec<f64>>, b: Arc<Vec<f64>>, threads: usize) {
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let mut pool = ThreadPool::with_limit(threads);
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// number of elements in each vector for each thread
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let steps = a.len() / threads;
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for i in 0..threads {
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// offset of the first element for the thread local vec
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let chunk = i * steps;
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// create a new strong reference to the vector
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let aa = a.clone();
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let bb = b.clone();
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// launch a new thread
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pool.enqueue(Task::new(
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(aa, bb, chunk, steps),
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|(aa, bb, chunk, steps)| {
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let a = &aa[chunk..(chunk + steps)];
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let b = &bb[chunk..(chunk + steps)];
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dot(a, b)
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},
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thread::{self, JoinHandle},
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};
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/// Default number if threads to be used in case [`std::thread::available_parallelism`] fails.
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pub const DEFAULT_THREAD_POOL_SIZE: usize = 1;
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/// Indicates the priority level of functions or closures which get supplied to the pool.
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/// Use [`Priority::High`] to ensure the closue to be executed before all closures that are already supplied
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/// Use [`Priority::Low`] to ensure the closue to be executed after all closures that are already supplied
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#[derive(Debug, Copy, Clone, Hash, PartialEq, Eq, PartialOrd, Ord)]
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pub enum Priority {
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/// Indicate that the closure or function supplied to the thread
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/// has higher priority than any other given to the pool until now.
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/// The item will get enqueued at the start of the waiting-queue.
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High,
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/// Indicate that the closure or function supplied to the thread pool
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/// has lower priority than the already supplied ones in this pool.
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/// The item will get enqueued at the end of the waiting-queue.
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Low,
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}
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/// Traits a return value has to implement when being given back by a function or closure.
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pub trait Sendable: Any + Send + 'static {}
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impl<T> Sendable for T where T: Any + Send + 'static {}
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/// A task that will be executed at some point in the future by the thread pool
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/// At the heart of this struct is the function to be executed. This may be a closure.
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#[derive(Debug, Copy, Clone)]
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pub struct Task<I, T>
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where
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I: Sendable,
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T: Sendable,
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{
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job: fn(I) -> T,
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param: I,
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}
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impl<I, T> Task<I, T>
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where
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I: Sendable,
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T: Sendable,
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{
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pub fn new(param: I, job: fn(I) -> T) -> Self {
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Self { job, param }
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}
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}
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/// Thread pool which can be used to execute functions or closures in parallel.
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/// The amount of threads to be used at maximum can be regulated by using `ThreadPool::with_limit`.
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/// This implementation is aimed to be of low runtime cost with minimal sychronisation due to blocking.
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/// Note that no threads will be spawned until jobs are supplied to be executed. For every supplied job
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/// a new thread will be launched until the maximum number is reached. By then every launched thread will
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/// be reused to process the remaining elements of the queue. If no jobs are left to be executed
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/// all threads will finish and die. This means that if nothing is done, no threads will run in idle in the background.
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/// # Example
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/// ```rust
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/// # use imsearch::multithreading::ThreadPool;
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/// # use imsearch::multithreading::Task;
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/// let mut pool = ThreadPool::with_limit(2);
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///
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/// for i in 0..10 {
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/// pool.enqueue(Task::new(i, |i| i));
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/// }
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///
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/// pool.join_all();
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/// assert_eq!(pool.get_results().iter().sum::<i32>(), 45);
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/// ```
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/// # Drop
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/// This struct implements the `Drop` trait. Upon being dropped the pool will wait for all threads
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/// to finsish. This may take up an arbitrary amount of time.
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/// # Panics in the thread
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/// When a function or closure panics, the executing thread will detect the unwind performed by `panic` causing the
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/// thread to print a message on stderr. The thread itself captures panics and won't terminate execution but continue with
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/// the next task in the queue.
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/// Its not recommend to use this pool with custom panic hooks or special functions which abort the process.
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/// Also panicking code from external program written in C++ or others in undefinied behavior according to [`std::panic::catch_unwind`]
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#[derive(Debug)]
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pub struct ThreadPool<I, T>
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where
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I: Sendable,
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T: Sendable,
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{
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/// queue for storing the jobs to be executed
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queue: Arc<Mutex<VecDeque<Task<I, T>>>>,
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/// handles for all threads currently running and processing jobs
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handles: Vec<JoinHandle<()>>,
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/// reciver end for channel based communication between threads
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receiver: Receiver<T>,
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/// sender end for channel based communication between threads
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sender: Sender<T>,
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/// maximum amount of threads to be used in parallel
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limit: NonZeroUsize,
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}
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impl<I, T> Default for ThreadPool<I, T>
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where
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I: Sendable,
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T: Sendable,
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{
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fn default() -> Self {
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let (sender, receiver) = channel::<T>();
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// determine default thread count to use based on the system
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let default =
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NonZeroUsize::new(DEFAULT_THREAD_POOL_SIZE).expect("Thread limit must be non-zero");
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let limit = thread::available_parallelism().unwrap_or(default);
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Self {
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queue: Arc::new(Mutex::new(VecDeque::new())),
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handles: Vec::new(),
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receiver,
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sender,
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limit,
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}
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}
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}
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impl<I, T> ThreadPool<I, T>
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where
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I: Sendable,
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T: Sendable,
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{
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/// Creates a new thread pool with default thread count determined by either
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/// [`std::thread::available_parallelism`] or [`DEFAULT_THREAD_POOL_SIZE`] in case it fails.
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/// No threads will be lauched until jobs are enqueued.
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pub fn new() -> Self {
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Default::default()
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}
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/// Creates a new thread pool with the given thread count. The pool will continue to launch new threads even if
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/// the system does not allow for that count of parallelism.
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/// No threads will be lauched until jobs are enqueued.
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/// # Panic
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/// This function will fails if `max_threads` is zero.
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pub fn with_limit(max_threads: usize) -> Self {
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let (sender, receiver) = channel::<T>();
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Self {
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limit: NonZeroUsize::new(max_threads).expect("Thread limit must be non-zero"),
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queue: Arc::new(Mutex::new(VecDeque::new())),
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handles: Vec::new(),
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sender,
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receiver,
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}
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}
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/// Put a new job into the queue to be executed by a thread in the future.
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/// The priority of the job will determine if the job will be put at the start or end of the queue.
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/// See [`crate::multithreading::Priority`].
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/// This function will create a new thread if the maximum number of threads in not reached.
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/// In case the maximum number of threads is already used, the job is stalled and will get executed
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/// when a thread is ready and its at the start of the queue.
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pub fn enqueue_priorize(&mut self, func: Task<I, T>, priority: Priority) {
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// put job into queue
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let mut queue = self.queue.lock().unwrap();
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// insert new job into queue depending on its priority
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match priority {
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Priority::High => queue.push_front(func),
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Priority::Low => queue.push_back(func),
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}
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if self.handles.len() < self.limit.get() {
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// we can still launch threads to run in parallel
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// clone the sender
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let tx = self.sender.clone();
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let queue = self.queue.clone();
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self.handles.push(thread::spawn(move || {
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while let Some(task) = queue.lock().unwrap().pop_front() {
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tx.send((task.job)(task.param))
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.expect("unable to send result over channel");
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}
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}));
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}
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self.handles.retain(|h| !h.is_finished());
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}
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/// Put a new job into the queue to be executed by a thread in the future.
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/// The priority of the job is automatically set to [`crate::multithreading::Priority::Low`].
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/// This function will create a new thread if the maximum number of threads in not reached.
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/// In case the maximum number of threads is already used, the job is stalled and will get executed
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/// when a thread is ready and its at the start of the queue.
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pub fn enqueue(&mut self, func: Task<I, T>) {
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self.enqueue_priorize(func, Priority::Low);
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}
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/// Wait for all threads to finish executing. This means that by the time all threads have finished
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/// every task will have been executed too. In other words the threads finsish when the queue of jobs is empty.
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/// This function will block the caller thread.
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pub fn join_all(&mut self) {
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while let Some(handle) = self.handles.pop() {
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handle.join().unwrap();
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}
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}
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/// Sendables all results that have been Sendableed by the threads until now
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/// and haven't been consumed yet.
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/// All results retrieved from this call won't be Sendableed on a second call.
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/// This function is non blocking.
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pub fn try_get_results(&mut self) -> Vec<T> {
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self.receiver.try_iter().collect()
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}
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/// Sendables all results that have been returned by the threads until now
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/// and haven't been consumed yet. The function will also wait for all threads to finish executing (empty the queue).
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/// All results retrieved from this call won't be returned on a second call.
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/// This function will block the caller thread.
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pub fn get_results(&mut self) -> Vec<T> {
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self.join_all();
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self.try_get_results()
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}
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}
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impl<I, T> Drop for ThreadPool<I, T>
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where
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I: Sendable,
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T: Sendable,
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{
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fn drop(&mut self) {
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self.join_all();
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}
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}
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#[cfg(test)]
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mod test {
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use std::panic::UnwindSafe;
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use super::*;
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#[test]
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fn test_default() {
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let mut pool = ThreadPool::default();
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for i in 0..10 {
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pool.enqueue_priorize(Task::new(i, |i| i), Priority::High);
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));
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}
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pool.join_all();
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assert_eq!(pool.try_get_results().iter().sum::<i32>(), 45);
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}
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#[test]
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fn test_limit() {
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let mut pool = ThreadPool::with_limit(2);
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for i in 0..10 {
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pool.enqueue(Task::new(i, |i| i));
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}
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assert_eq!(pool.handles.len(), 2);
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assert_eq!(pool.limit.get(), 2);
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pool.join_all();
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assert_eq!(pool.get_results().iter().sum::<i32>(), 45);
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}
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trait Object: Send + UnwindSafe {
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fn get(&mut self) -> i32;
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}
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#[derive(Default)]
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struct Test1 {
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_int: i32,
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}
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impl Object for Test1 {
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fn get(&mut self) -> i32 {
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0
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}
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}
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#[derive(Default)]
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struct Test2 {
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_c: char,
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}
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impl Object for Test2 {
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fn get(&mut self) -> i32 {
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0
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}
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}
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#[derive(Default)]
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struct Test3 {
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_s: String,
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}
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impl Object for Test3 {
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fn get(&mut self) -> i32 {
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0
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}
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}
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#[test]
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fn test_1() {
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let mut pool = ThreadPool::with_limit(2);
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let feats: Vec<Box<dyn Object>> = vec![
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Box::new(Test1::default()),
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Box::new(Test2::default()),
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Box::new(Test3::default()),
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];
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for feat in feats {
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pool.enqueue(Task::new(feat, |mut i| {
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let _ = i.get();
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i
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}));
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}
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pool.join_all();
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let _feats: Vec<Box<dyn Object>> = pool.get_results();
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}
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black_box(pool.get_results().iter().sum::<f64>());
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}
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/// Compute a simple hash value for the given index value.
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/// This function will return a value between [0, 1].
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#[inline]
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fn hash(x: f64) -> f64 {
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((x * 234.8743 + 3.8274).sin() * 87624.58376).fract()
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}
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/// Create a vector filled with `size` elements of 64-bit floating point numbers
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/// each initialized with the function `hash` and the given seed. The vector will
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/// be filled with values between [0, 1].
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fn create_vec(size: usize, seed: u64) -> Arc<Vec<f64>> {
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let mut vec = Vec::with_capacity(size);
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for i in 0..size {
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vec.push(hash(i as f64 + seed as f64));
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}
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Arc::new(vec)
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}
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/// Function for executing the thread pool benchmarks using criterion.rs.
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/// It will create two different vectors and benchmark the single thread performance
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/// as well as the multi threadded performance for varying amounts of threads.
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pub fn bench_threadpool(c: &mut Criterion) {
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let vec_a = create_vec(VEC_ELEM_COUNT, VEC_SEEDS[0]);
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let vec_b = create_vec(VEC_ELEM_COUNT, VEC_SEEDS[1]);
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let mut group = c.benchmark_group("threadpool with various number of threads");
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for threads in THREAD_COUNTS.iter() {
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group.throughput(Throughput::Bytes(*threads as u64));
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group.bench_with_input(BenchmarkId::from_parameter(threads), threads, |b, _| {
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b.iter(|| {
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dot_parallel(vec_a.clone(), vec_b.clone(), *threads);
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});
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});
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}
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group.finish();
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}
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/// Benchmark the effects of over and underusing a thread pools thread capacity.
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/// The thread pool will automatically choose the number of threads to use.
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/// We will then run a custom number of jobs with that pool that may be smaller or larger
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/// than the amount of threads the pool can offer.
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fn pool_overusage(a: Arc<Vec<f64>>, b: Arc<Vec<f64>>, threads: usize) {
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// automatically choose the number of threads
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let mut pool = ThreadPool::new();
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// number of elements in each vector for each thread
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let steps = a.len() / threads;
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for i in 0..threads {
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// offset of the first element for the thread local vec
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let chunk = i * steps;
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// create a new strong reference to the vector
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let aa = a.clone();
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let bb = b.clone();
|
||||
// launch a new thread
|
||||
pool.enqueue(Task::new(
|
||||
(aa, bb, chunk, steps),
|
||||
|(aa, bb, chunk, steps)| {
|
||||
let a = &aa[chunk..(chunk + steps)];
|
||||
let b = &bb[chunk..(chunk + steps)];
|
||||
dot(a, b)
|
||||
},
|
||||
));
|
||||
}
|
||||
|
||||
pool.join_all();
|
||||
|
||||
black_box(pool.get_results().iter().sum::<f64>());
|
||||
}
|
||||
|
||||
/// Benchmark the effects of over and underusing a thread pools thread capacity.
|
||||
/// The thread pool will automatically choose the number of threads to use.
|
||||
/// We will then run a custom number of jobs with that pool that may be smaller or larger
|
||||
/// than the amount of threads the pool can offer.
|
||||
pub fn bench_overusage(c: &mut Criterion) {
|
||||
let vec_a = create_vec(VEC_ELEM_COUNT, VEC_SEEDS[0]);
|
||||
let vec_b = create_vec(VEC_ELEM_COUNT, VEC_SEEDS[1]);
|
||||
|
||||
let mut group = c.benchmark_group("threadpool overusage");
|
||||
|
||||
for threads in THREAD_COUNTS.iter() {
|
||||
group.throughput(Throughput::Bytes(*threads as u64));
|
||||
group.bench_with_input(BenchmarkId::from_parameter(threads), threads, |b, _| {
|
||||
b.iter(|| {
|
||||
pool_overusage(vec_a.clone(), vec_b.clone(), *threads);
|
||||
});
|
||||
});
|
||||
}
|
||||
group.finish();
|
||||
}
|
||||
|
||||
/// Benchmark the performance of a single thread used to calculate the dot product.
|
||||
pub fn bench_single_threaded(c: &mut Criterion) {
|
||||
let vec_a = create_vec(VEC_ELEM_COUNT, VEC_SEEDS[0]);
|
||||
let vec_b = create_vec(VEC_ELEM_COUNT, VEC_SEEDS[1]);
|
||||
|
||||
c.bench_function("single threaded", |s| {
|
||||
s.iter(|| {
|
||||
black_box(dot(&vec_a, &vec_b));
|
||||
});
|
||||
});
|
||||
}
|
||||
|
||||
criterion_group!(
|
||||
benches,
|
||||
bench_single_threaded,
|
||||
bench_threadpool,
|
||||
bench_overusage
|
||||
);
|
||||
criterion_main!(benches);
|
||||
|
|
|
|||
|
|
@ -88,16 +88,13 @@ where
|
|||
*self.index(index)
|
||||
}
|
||||
/// Returns all pixel of the image
|
||||
pub fn pixels(&self, index: usize) -> &Vec<(T, T, T, T)> {
|
||||
pub fn pixels(&self) -> &Vec<(T, T, T, T)> {
|
||||
&self.pixels
|
||||
}
|
||||
/// Returns the path of the image
|
||||
pub fn path(&self) -> &PathBuf {
|
||||
&self.path
|
||||
}
|
||||
pub fn pixels(&self) -> &Vec<(T, T, T, T)> {
|
||||
&self.pixels
|
||||
}
|
||||
|
||||
/// Returns the iterator of the pixels vector
|
||||
pub fn iter(&self) -> Iter<'_, (T, T, T, T)> {
|
||||
|
|
|
|||
|
|
@ -41,14 +41,9 @@ pub fn image_loader(path: &Path) -> Result<Image<f32>, &'static str> {
|
|||
let color_type = reader.info().color_type;
|
||||
let width = reader.info().width;
|
||||
let height = reader.info().height;
|
||||
let palette = &reader.info().palette;
|
||||
|
||||
let idat = &buf[..info.buffer_size()];
|
||||
|
||||
println!("idat {:?} idat ", idat);
|
||||
println!("palette {:?} palette", palette);
|
||||
println!("depth {:?} depth", bit_depth);
|
||||
|
||||
let pixel_vec = match color_type {
|
||||
png::ColorType::Grayscale => grayscale_to_rgba(idat, bit_depth),
|
||||
png::ColorType::GrayscaleAlpha => grayscale_alpha_to_rgba(idat, bit_depth),
|
||||
|
|
@ -57,12 +52,7 @@ pub fn image_loader(path: &Path) -> Result<Image<f32>, &'static str> {
|
|||
_ => panic!("Unsupported color type or bit depth"),
|
||||
}?;
|
||||
|
||||
let image: Image<f32> = Image::new(
|
||||
width as usize,
|
||||
height as usize,
|
||||
pixel_vec,
|
||||
path.to_path_buf(),
|
||||
);
|
||||
let image: Image<f32> = Image::new(width, height, pixel_vec, path.to_path_buf());
|
||||
|
||||
Ok(image)
|
||||
}
|
||||
|
|
|
|||
15
src/lib.rs
15
src/lib.rs
|
|
@ -4,18 +4,3 @@ pub mod image;
|
|||
pub mod image_loader;
|
||||
pub mod multithreading;
|
||||
pub mod search_index;
|
||||
|
||||
pub fn add(left: usize, right: usize) -> usize {
|
||||
left + right
|
||||
}
|
||||
|
||||
#[cfg(test)]
|
||||
mod tests {
|
||||
use super::*;
|
||||
|
||||
#[test]
|
||||
fn it_works() {
|
||||
let result = add(2, 2);
|
||||
assert_eq!(result, 4);
|
||||
}
|
||||
}
|
||||
|
|
|
|||
|
|
@ -8,7 +8,7 @@
|
|||
//! You also need a Vector of Feature generator functions that generates the feature of every image
|
||||
//!
|
||||
//!
|
||||
//!```
|
||||
//!```rust ignore
|
||||
//! # use std::path::{Path, PathBuf};
|
||||
//! # use imsearch::image::Image;
|
||||
//! # use imsearch::search_index;
|
||||
|
|
@ -17,8 +17,8 @@
|
|||
//! let path: Vec<PathBuf> = Vec::new();
|
||||
//! let features: Vec<FeatureGenerator> = Vec::new();
|
||||
//!
|
||||
//! let mut database = search_index::Database::new(&path, features );
|
||||
//! database.add_image(Path::new("testpath"));
|
||||
//! let mut database = search_index::Database::new(&path, features).unwrap();
|
||||
//! database.add_image(Path::new("testpath")).unwrap();
|
||||
//! ```
|
||||
//!
|
||||
//!
|
||||
|
|
@ -266,23 +266,34 @@ impl Database {
|
|||
///This function search the Database after the Similarity to a given Image in a specific feature.
|
||||
/// It returns a Vector of all images and a f32 value which represents the Similarity in percent.
|
||||
///
|
||||
pub fn search(&self, imagepath: &Path, feature: FeatureGenerator) -> Vec<(PathBuf, f32)> {
|
||||
pub fn search(
|
||||
&self,
|
||||
imagepath: &Path,
|
||||
feature: FeatureGenerator,
|
||||
) -> Result<Vec<(PathBuf, f32)>, &'static str> {
|
||||
self.images.search(imagepath, feature)
|
||||
}
|
||||
|
||||
///the new function generates a new Database out of a vector of the Paths of the Images and a Vector of features
|
||||
pub fn new(imagepaths: &Vec<PathBuf>, features: Vec<FeatureGenerator>) -> Self {
|
||||
pub fn new(
|
||||
imagepaths: &Vec<PathBuf>,
|
||||
features: Vec<FeatureGenerator>,
|
||||
) -> Result<Self, &'static str> {
|
||||
let mut threadpool = ThreadPool::new();
|
||||
Self {
|
||||
images: IndexedImages::new(imagepaths, &features, &mut threadpool),
|
||||
let images = match IndexedImages::new(imagepaths, &features, &mut threadpool) {
|
||||
Ok(images) => images,
|
||||
Err(e) => return Err(e),
|
||||
};
|
||||
Ok(Self {
|
||||
images,
|
||||
generators: features,
|
||||
threadpool,
|
||||
}
|
||||
})
|
||||
}
|
||||
|
||||
/// with add_image you can add images in a existing database.
|
||||
/// databases from a file are read only.
|
||||
pub fn add_image(&mut self, path: &Path) {
|
||||
pub fn add_image(&mut self, path: &Path) -> Result<(), &'static str> {
|
||||
if !self.generators.is_empty() {
|
||||
self.images
|
||||
.add_image(path, &self.generators, &mut self.threadpool)
|
||||
|
|
@ -317,11 +328,14 @@ impl IndexedImages {
|
|||
imagepaths: &Vec<PathBuf>,
|
||||
features: &[FeatureGenerator],
|
||||
threadpool: &mut ThreadPool<Arc<Image<f32>>, (String, FeatureResult)>,
|
||||
) -> Self {
|
||||
) -> Result<Self, &'static str> {
|
||||
let mut images_with_feats = HashMap::new();
|
||||
|
||||
for path in imagepaths {
|
||||
let image: Arc<Image<f32>> = Arc::new(Image::default()); //todo!("Image reader function")
|
||||
let image = match crate::image_loader::image_loader(path) {
|
||||
Ok(image) => Arc::new(image),
|
||||
Err(desc) => return Err(desc),
|
||||
};
|
||||
let mut feats = HashMap::new();
|
||||
|
||||
for generator in features.iter() {
|
||||
|
|
@ -336,16 +350,23 @@ impl IndexedImages {
|
|||
images_with_feats.insert(image.path().clone(), feats);
|
||||
}
|
||||
|
||||
Self {
|
||||
Ok(Self {
|
||||
images: images_with_feats,
|
||||
}
|
||||
})
|
||||
}
|
||||
|
||||
///This function search the Database after the Similarity to a given Image in a specific feature.
|
||||
/// It returns a Vector of all images and a f32 value which represents the Similarity in percent.
|
||||
///
|
||||
fn search(&self, imagepath: &Path, feature: FeatureGenerator) -> Vec<(PathBuf, f32)> {
|
||||
let image: Arc<Image<f32>> = Arc::new(Image::default()); //todo!("Image reader function")
|
||||
fn search(
|
||||
&self,
|
||||
imagepath: &Path,
|
||||
feature: FeatureGenerator,
|
||||
) -> Result<Vec<(PathBuf, f32)>, &'static str> {
|
||||
let image = match crate::image_loader::image_loader(imagepath) {
|
||||
Ok(image) => Arc::new(image),
|
||||
Err(desc) => return Err(desc),
|
||||
};
|
||||
let search_feat = feature(image);
|
||||
let mut result: Vec<(PathBuf, f32)> = Vec::new();
|
||||
|
||||
|
|
@ -356,7 +377,7 @@ impl IndexedImages {
|
|||
}
|
||||
}
|
||||
}
|
||||
result
|
||||
Ok(result)
|
||||
}
|
||||
|
||||
///this function lets you add images to the Indexed Image struct
|
||||
|
|
@ -365,8 +386,11 @@ impl IndexedImages {
|
|||
path: &Path,
|
||||
generator: &Vec<FeatureGenerator>,
|
||||
threadpool: &mut ThreadPool<Arc<Image<f32>>, (String, FeatureResult)>,
|
||||
) {
|
||||
let image: Arc<Image<f32>> = Arc::new(Image::default()); //todo!("Image reader function")
|
||||
) -> Result<(), &'static str> {
|
||||
let image = match crate::image_loader::image_loader(path) {
|
||||
Ok(image) => Arc::new(image),
|
||||
Err(desc) => return Err(desc),
|
||||
};
|
||||
let mut feats = HashMap::new();
|
||||
|
||||
for gen in generator {
|
||||
|
|
@ -378,13 +402,9 @@ impl IndexedImages {
|
|||
feats.insert(name, result);
|
||||
}
|
||||
self.images.insert(image.path().clone(), feats);
|
||||
}
|
||||
}
|
||||
|
||||
/// example feature implementation
|
||||
#[allow(dead_code)]
|
||||
fn average_luminance(image: Arc<Image<f32>>) -> (String, FeatureResult) {
|
||||
(String::from("average-brightness"), FeatureResult::F32(0.0))
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
|
||||
#[cfg(test)]
|
||||
|
|
|
|||
Loading…
Reference in New Issue