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Code Issues Releases Wiki Activity

feat: Introduce the Highlight type to simplify the data oriented design

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Clément Renault 2019-06-25 12:27:15 +02:00
parent b7ed22bc59
commit 6b6db2f8e6
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GPG Key ID: 0151CDAB43460DAE
2 changed files with 52 additions and 123 deletions
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145
meilidb-core/src/lib.rs
View File

@ -60,97 +60,43 @@ pub struct DocIndex {
///
/// The order of the field is important because it defines
/// the way these structures are ordered between themselves.
///
/// The word in itself is not important.
// TODO do data oriented programming ? very arrays ?
#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct Match {
/// The word index in the query sentence.
/// Same as the `attribute_index` but for the query words.
///
/// Used to retrieve the automaton that match this word.
pub query_index: u32,
/// The distance the word has with the query word
/// (i.e. the Levenshtein distance).
pub distance: u8,
pub struct Highlight {
/// The attribute in the document where the word was found
/// along with the index in it.
pub attribute: u16,
pub word_index: u16,
/// Whether the word that match is an exact match or a prefix.
pub is_exact: bool,
/// The position in bytes where the word was found
/// along with the length of it.
/// The position in bytes where the word was found.
///
/// It informs on the original word area in the text indexed
/// without needing to run the tokenizer again.
pub char_index: u16,
/// The length in bytes of the found word.
///
/// It informs on the original word area in the text indexed
/// without needing to run the tokenizer again.
pub char_length: u16,
}
impl Match {
pub fn zero() -> Self {
Match {
query_index: 0,
distance: 0,
attribute: 0,
word_index: 0,
is_exact: false,
char_index: 0,
char_length: 0,
}
}
pub fn max() -> Self {
Match {
query_index: u32::max_value(),
distance: u8::max_value(),
attribute: u16::max_value(),
word_index: u16::max_value(),
is_exact: true,
char_index: u16::max_value(),
char_length: u16::max_value(),
}
}
#[derive(Debug, PartialOrd, Ord, PartialEq, Eq)]
struct TmpMatch {
pub query_index: u32,
pub distance: u8,
pub attribute: u16,
pub word_index: u16,
pub is_exact: bool,
}
#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct Document {
pub id: DocumentId,
pub matches: Vec<Match>,
pub highlights: Vec<Highlight>,
}
impl Document {
fn from_raw(raw: &RawDocument) -> Document {
let len = raw.matches.range.len();
let mut matches = Vec::with_capacity(len);
let query_index = raw.query_index();
let distance = raw.distance();
let attribute = raw.attribute();
let word_index = raw.word_index();
let is_exact = raw.is_exact();
let char_index = raw.char_index();
let char_length = raw.char_length();
for i in 0..len {
let match_ = Match {
query_index: query_index[i],
distance: distance[i],
attribute: attribute[i],
word_index: word_index[i],
is_exact: is_exact[i],
char_index: char_index[i],
char_length: char_length[i],
};
matches.push(match_);
}
Document { id: raw.id, matches }
fn from_raw(raw: RawDocument) -> Document {
Document { id: raw.id, highlights: raw.highlights }
}
}
@ -158,11 +104,12 @@ impl Document {
pub struct RawDocument {
pub id: DocumentId,
pub matches: SharedMatches,
pub highlights: Vec<Highlight>,
}
impl RawDocument {
fn new(id: DocumentId, range: Range, matches: Arc<Matches>) -> RawDocument {
RawDocument { id, matches: SharedMatches { range, matches } }
fn new(id: DocumentId, matches: SharedMatches, highlights: Vec<Highlight>) -> RawDocument {
RawDocument { id, matches, highlights }
}
pub fn query_index(&self) -> &[u32] {
@ -199,20 +146,6 @@ impl RawDocument {
// can only be done in this module
unsafe { &self.matches.matches.is_exact.get_unchecked(r.start..r.end) }
}
pub fn char_index(&self) -> &[u16] {
let r = self.matches.range;
// it is safe because construction/modifications
// can only be done in this module
unsafe { &self.matches.matches.char_index.get_unchecked(r.start..r.end) }
}
pub fn char_length(&self) -> &[u16] {
let r = self.matches.range;
// it is safe because construction/modifications
// can only be done in this module
unsafe { &self.matches.matches.char_length.get_unchecked(r.start..r.end) }
}
}
impl fmt::Debug for RawDocument {
@ -224,27 +157,30 @@ impl fmt::Debug for RawDocument {
.field("attribute", &self.attribute())
.field("word_index", &self.word_index())
.field("is_exact", &self.is_exact())
.field("char_index", &self.char_index())
.field("char_length", &self.char_length())
.finish()
}
}
pub fn raw_documents_from_matches(matches: SetBuf<(DocumentId, Match)>) -> Vec<RawDocument> {
let mut docs_ranges = Vec::<(_, Range)>::new();
fn raw_documents_from_matches(matches: SetBuf<(DocumentId, TmpMatch, Highlight)>) -> Vec<RawDocument> {
let mut docs_ranges = Vec::<(DocumentId, Range, Vec<Highlight>)>::new();
let mut matches2 = Matches::with_capacity(matches.len());
for group in matches.linear_group_by(|(a, _), (b, _)| a == b) {
let id = group[0].0;
let start = docs_ranges.last().map(|(_, r)| r.end).unwrap_or(0);
for group in matches.linear_group_by(|(a, _, _), (b, _, _)| a == b) {
let document_id = group[0].0;
let start = docs_ranges.last().map(|(_, r, _)| r.end).unwrap_or(0);
let end = start + group.len();
docs_ranges.push((id, Range { start, end }));
let highlights = group.iter().map(|(_, _, h)| *h).collect();
docs_ranges.push((document_id, Range { start, end }, highlights));
matches2.extend_from_slice(group);
}
let matches = Arc::new(matches2);
docs_ranges.into_iter().map(|(i, r)| RawDocument::new(i, r, matches.clone())).collect()
docs_ranges.into_iter().map(|(i, range, highlights)| {
let matches = SharedMatches { range, matches: matches.clone() };
RawDocument::new(i, matches, highlights)
}).collect()
}
#[derive(Debug, Copy, Clone)]
@ -253,12 +189,6 @@ struct Range {
end: usize,
}
impl Range {
fn len(self) -> usize {
self.end - self.start
}
}
#[derive(Clone)]
pub struct SharedMatches {
range: Range,
@ -272,8 +202,6 @@ struct Matches {
attribute: Vec<u16>,
word_index: Vec<u16>,
is_exact: Vec<bool>,
char_index: Vec<u16>,
char_length: Vec<u16>,
}
impl Matches {
@ -284,25 +212,20 @@ impl Matches {
attribute: Vec::with_capacity(cap),
word_index: Vec::with_capacity(cap),
is_exact: Vec::with_capacity(cap),
char_index: Vec::with_capacity(cap),
char_length: Vec::with_capacity(cap),
}
}
fn extend_from_slice(&mut self, matches: &[(DocumentId, Match)]) {
for (_, match_) in matches {
fn extend_from_slice(&mut self, matches: &[(DocumentId, TmpMatch, Highlight)]) {
for (_, match_, _) in matches {
self.query_index.push(match_.query_index);
self.distance.push(match_.distance);
self.attribute.push(match_.attribute);
self.word_index.push(match_.word_index);
self.is_exact.push(match_.is_exact);
self.char_index.push(match_.char_index);
self.char_length.push(match_.char_length);
}
}
}
#[cfg(test)]
mod tests {
use super::*;

30
meilidb-core/src/query_builder.rs
View File

@ -5,7 +5,7 @@ use std::time::Instant;
use std::{cmp, mem};
use fst::{Streamer, IntoStreamer};
use hashbrown::{HashMap, HashSet};
use hashbrown::HashMap;
use log::info;
use meilidb_tokenizer::{is_cjk, split_query_string};
use rayon::slice::ParallelSliceMut;
@ -18,7 +18,7 @@ use crate::distinct_map::{DistinctMap, BufferedDistinctMap};
use crate::criterion::Criteria;
use crate::raw_documents_from_matches;
use crate::reordered_attrs::ReorderedAttrs;
use crate::{Match, DocumentId, Store, RawDocument, Document};
use crate::{TmpMatch, Highlight, DocumentId, Store, RawDocument, Document};
const NGRAMS: usize = 3;
@ -178,12 +178,12 @@ fn generate_automatons<S: Store>(query: &str, store: &S) -> Result<Vec<Automaton
Ok(automatons)
}
fn rewrite_matched_positions(matches: &mut [(DocumentId, Match)]) {
for document_matches in matches.linear_group_by_mut(|(a, _), (b, _)| a == b) {
fn rewrite_matched_positions(matches: &mut [(DocumentId, TmpMatch, Highlight)]) {
for document_matches in matches.linear_group_by_mut(|(a, _, _), (b, _, _)| a == b) {
let mut offset = 0;
for query_indexes in document_matches.linear_group_by_mut(|(_, a), (_, b)| a.query_index == b.query_index) {
for query_indexes in document_matches.linear_group_by_mut(|(_, a, _), (_, b, _)| a.query_index == b.query_index) {
let word_index = query_indexes[0].1.word_index - offset as u16;
for (_, match_) in query_indexes.iter_mut() {
for (_, match_, _) in query_indexes.iter_mut() {
match_.word_index = word_index;
}
offset += query_indexes.len() - 1;
@ -268,17 +268,19 @@ where S: Store,
for di in doc_indexes.as_slice() {
let attribute = searchables.map_or(Some(di.attribute), |r| r.get(di.attribute));
if let Some(attribute) = attribute {
let match_ = Match {
let match_ = TmpMatch {
query_index: query_index as u32,
distance,
attribute,
word_index: di.word_index,
is_exact,
};
let highlight = Highlight {
attribute: di.attribute,
char_index: di.char_index,
char_length: di.char_length,
};
matches.push((di.document_id, match_));
matches.push((di.document_id, match_, highlight));
}
}
}
@ -289,7 +291,11 @@ where S: Store,
rewrite_matched_positions(&mut matches);
let total_matches = matches.len();
let padded_matches = SetBuf::from_dirty(matches);
let padded_matches = {
matches.par_sort_unstable();
matches.dedup();
SetBuf::new_unchecked(matches)
};
let raw_documents = raw_documents_from_matches(padded_matches);
info!("{} total documents to classify", raw_documents.len());
@ -349,7 +355,7 @@ where S: Store,
let offset = cmp::min(documents.len(), range.start);
let iter = documents.into_iter().skip(offset).take(range.len());
Ok(iter.map(|d| Document::from_raw(&d)).collect())
Ok(iter.map(|d| Document::from_raw(d)).collect())
}
}
@ -476,7 +482,7 @@ where S: Store,
};
if distinct_accepted && seen.len() > range.start {
out_documents.push(Document::from_raw(&document));
out_documents.push(Document::from_raw(document));
if out_documents.len() == range.len() { break }
}
}