Merge pull request #158 from shekhirin/synonyms

Support synonyms

http-ui/src/main.rs

@@ -260,6 +260,9 @@ struct Settings {
 
     #[serde(default, skip_serializing_if = "Setting::is_not_set")]
     stop_words: Setting<BTreeSet<String>>,
+
+    #[serde(default, skip_serializing_if = "Setting::is_not_set")]
+    synonyms: Setting<HashMap<String, Vec<String>>>,
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
@@ -431,6 +434,13 @@ async fn main() -> anyhow::Result<()> {
                         Setting::NotSet => ()
                     }
 
+                    // We transpose the settings JSON struct into a real setting update.
+                    match settings.synonyms {
+                        Setting::Set(synonyms) => builder.set_synonyms(synonyms),
+                        Setting::Reset => builder.reset_synonyms(),
+                        Setting::NotSet => ()
+                    }
+
                     let result = builder.execute(|indexing_step, update_id| {
                         let (current, total) = match indexing_step {
                             TransformFromUserIntoGenericFormat { documents_seen } => (documents_seen, None),
@@ -1011,10 +1021,11 @@ mod tests {
             faceted_attributes: Setting::Set(hashmap! { "age".into() => "integer".into() }),
             criteria: Setting::Set(vec!["asc(age)".to_string()]),
             stop_words: Setting::Set(btreeset! { "and".to_string() }),
+            synonyms: Setting::Set(hashmap! { "alex".to_string() => vec!["alexey".to_string()] })
         };
 
         assert_tokens(&settings, &[
-            Token::Struct { name: "Settings", len: 5 },
+            Token::Struct { name: "Settings", len: 6 },
             Token::Str("displayedAttributes"),
             Token::Some,
             Token::Seq { len: Some(1) },
@@ -1041,6 +1052,14 @@ mod tests {
             Token::Seq { len: Some(1) },
             Token::Str("and"),
             Token::SeqEnd,
+            Token::Str("synonyms"),
+            Token::Some,
+            Token::Map { len: Some(1) },
+            Token::Str("alex"),
+            Token::Seq {len: Some(1) },
+            Token::Str("alexey"),
+            Token::SeqEnd,
+            Token::MapEnd,
             Token::StructEnd,
         ]);
     }
@@ -1053,10 +1072,11 @@ mod tests {
             faceted_attributes: Setting::Reset,
             criteria: Setting::Reset,
             stop_words: Setting::Reset,
+            synonyms: Setting::Reset,
         };
 
         assert_tokens(&settings, &[
-            Token::Struct { name: "Settings", len: 5 },
+            Token::Struct { name: "Settings", len: 6 },
             Token::Str("displayedAttributes"),
             Token::None,
             Token::Str("searchableAttributes"),
@@ -1067,6 +1087,8 @@ mod tests {
             Token::None,
             Token::Str("stopWords"),
             Token::None,
+            Token::Str("synonyms"),
+            Token::None,
             Token::StructEnd,
         ]);
     }
@@ -1079,6 +1101,7 @@ mod tests {
             faceted_attributes: Setting::NotSet,
             criteria: Setting::NotSet,
             stop_words: Setting::NotSet,
+            synonyms: Setting::NotSet,
         };
 
         assert_tokens(&settings, &[

milli/src/index.rs

@@ -3,19 +3,19 @@ use std::collections::HashMap;
 use std::path::Path;
 
 use anyhow::Context;
+use chrono::{DateTime, Utc};
+use heed::{Database, PolyDatabase, RoTxn, RwTxn};
 use heed::types::*;
-use heed::{PolyDatabase, Database, RwTxn, RoTxn};
 use roaring::RoaringBitmap;
-use chrono::{Utc, DateTime};
 
+use crate::{Criterion, default_criteria, FacetDistribution, FieldsDistribution, Search};
+use crate::{BEU32, DocumentId, ExternalDocumentsIds, FieldId};
+use crate::{
+    BEU32StrCodec, BoRoaringBitmapCodec, CboRoaringBitmapCodec,
+    ObkvCodec, RoaringBitmapCodec, RoaringBitmapLenCodec, StrStrU8Codec,
+};
 use crate::facet::FacetType;
 use crate::fields_ids_map::FieldsIdsMap;
-use crate::{default_criteria, Criterion, Search, FacetDistribution, FieldsDistribution};
-use crate::{BEU32, DocumentId, FieldId, ExternalDocumentsIds};
-use crate::{
-    RoaringBitmapCodec, RoaringBitmapLenCodec, BEU32StrCodec,
-    StrStrU8Codec, ObkvCodec, BoRoaringBitmapCodec, CboRoaringBitmapCodec,
-};
 
 pub const CRITERIA_KEY: &str = "criteria";
 pub const DISPLAYED_FIELDS_KEY: &str = "displayed-fields";
@@ -31,6 +31,7 @@ pub const HARD_EXTERNAL_DOCUMENTS_IDS_KEY: &str = "hard-external-documents-ids";
 pub const SOFT_EXTERNAL_DOCUMENTS_IDS_KEY: &str = "soft-external-documents-ids";
 pub const WORDS_FST_KEY: &str = "words-fst";
 pub const STOP_WORDS_KEY: &str = "stop-words";
+pub const SYNONYMS_KEY: &str = "synonyms";
 pub const WORDS_PREFIXES_FST_KEY: &str = "words-prefixes-fst";
 const CREATED_AT_KEY: &str = "created-at";
 const UPDATED_AT_KEY: &str = "updated-at";
@@ -376,12 +377,12 @@ impl Index {
 
     /* words fst */
 
-    /// Writes the FST which is the words dictionnary of the engine.
+    /// Writes the FST which is the words dictionary of the engine.
     pub fn put_words_fst<A: AsRef<[u8]>>(&self, wtxn: &mut RwTxn, fst: &fst::Set<A>) -> heed::Result<()> {
         self.main.put::<_, Str, ByteSlice>(wtxn, WORDS_FST_KEY, fst.as_fst().as_bytes())
     }
 
-    /// Returns the FST which is the words dictionnary of the engine.
+    /// Returns the FST which is the words dictionary of the engine.
     pub fn words_fst<'t>(&self, rtxn: &'t RoTxn) -> anyhow::Result<fst::Set<Cow<'t, [u8]>>> {
         match self.main.get::<_, Str, ByteSlice>(rtxn, WORDS_FST_KEY)? {
             Some(bytes) => Ok(fst::Set::new(bytes)?.map_data(Cow::Borrowed)?),
@@ -398,6 +399,7 @@ impl Index {
     pub fn delete_stop_words(&self, wtxn: &mut RwTxn) -> heed::Result<bool> {
         self.main.delete::<_, Str>(wtxn, STOP_WORDS_KEY)
     }
+
     pub fn stop_words<'t>(&self, rtxn: &'t RoTxn) -> anyhow::Result<Option<fst::Set<&'t [u8]>>> {
         match self.main.get::<_, Str, ByteSlice>(rtxn, STOP_WORDS_KEY)? {
             Some(bytes) => Ok(Some(fst::Set::new(bytes)?)),
@@ -405,6 +407,25 @@ impl Index {
         }
     }
 
+    /* synonyms */
+
+    pub fn put_synonyms(&self, wtxn: &mut RwTxn, synonyms: &HashMap<Vec<String>, Vec<Vec<String>>>) -> heed::Result<()> {
+        self.main.put::<_, Str, SerdeBincode<_>>(wtxn, SYNONYMS_KEY, synonyms)
+    }
+
+    pub fn delete_synonyms(&self, wtxn: &mut RwTxn) -> heed::Result<bool> {
+        self.main.delete::<_, Str>(wtxn, SYNONYMS_KEY)
+    }
+
+    pub fn synonyms(&self, rtxn: &RoTxn) -> heed::Result<HashMap<Vec<String>, Vec<Vec<String>>>> {
+        Ok(self.main.get::<_, Str, SerdeBincode<_>>(rtxn, SYNONYMS_KEY)?.unwrap_or_default())
+    }
+
+    pub fn words_synonyms<S: AsRef<str>>(&self, rtxn: &RoTxn, words: &[S]) -> heed::Result<Option<Vec<Vec<String>>>> {
+        let words: Vec<_> = words.iter().map(|s| s.as_ref().to_owned()).collect();
+        Ok(self.synonyms(rtxn)?.remove(&words))
+    }
+
     /* words prefixes fst */
 
     /// Writes the FST which is the words prefixes dictionnary of the engine.
@@ -536,7 +557,7 @@ pub(crate) mod tests {
         let rtxn = index.read_txn().unwrap();
 
         let fields_distribution = index.fields_distribution(&rtxn).unwrap();
-        assert_eq!(fields_distribution, hashmap!{
+        assert_eq!(fields_distribution, hashmap! {
             "name".to_string() => 2,
             "age".to_string() => 1,
         });

milli/src/search/query_tree.rs

@@ -177,12 +177,12 @@ impl<'a> Context for QueryTreeBuilder<'a> {
         self.index.word_docids.get(self.rtxn, word)
     }
 
-    fn word_documents_count(&self, word: &str) -> heed::Result<Option<u64>> {
+    fn synonyms<S: AsRef<str>>(&self, words: &[S]) -> heed::Result<Option<Vec<Vec<String>>>> {
-        self.index.word_documents_count(self.rtxn, word)
+        self.index.words_synonyms(self.rtxn, words)
     }
 
-    fn synonyms<S: AsRef<str>>(&self, _words: &[S]) -> heed::Result<Option<Vec<Vec<String>>>> {
+    fn word_documents_count(&self, word: &str) -> heed::Result<Option<u64>> {
-        Ok(None)
+        self.index.word_documents_count(self.rtxn, word)
     }
 }
 
@@ -588,7 +588,6 @@ mod test {
     }
 
     impl Default for TestContext {
-
         fn default() -> TestContext {
             let mut rng = StdRng::seed_from_u64(102);
             let rng = &mut rng;

milli/src/update/settings.rs

@@ -5,6 +5,7 @@ use anyhow::Context;
 use chrono::Utc;
 use grenad::CompressionType;
 use itertools::Itertools;
+use meilisearch_tokenizer::{Analyzer, AnalyzerConfig};
 use rayon::ThreadPool;
 use serde::{Deserialize, Deserializer, Serialize, Serializer};
 
@@ -71,6 +72,7 @@ pub struct Settings<'a, 't, 'u, 'i> {
     criteria: Setting<Vec<String>>,
     stop_words: Setting<BTreeSet<String>>,
     distinct_attribute: Setting<String>,
+    synonyms: Setting<HashMap<String, Vec<String>>>,
 }
 
 impl<'a, 't, 'u, 'i> Settings<'a, 't, 'u, 'i> {
@@ -96,6 +98,7 @@ impl<'a, 't, 'u, 'i> Settings<'a, 't, 'u, 'i> {
             criteria: Setting::NotSet,
             stop_words: Setting::NotSet,
             distinct_attribute: Setting::NotSet,
+            synonyms: Setting::NotSet,
             update_id,
         }
     }
@@ -144,12 +147,24 @@ impl<'a, 't, 'u, 'i> Settings<'a, 't, 'u, 'i> {
         }
     }
 
+    pub fn reset_distinct_attribute(&mut self) {
+        self.distinct_attribute = Setting::Reset;
+    }
+
     pub fn set_distinct_attribute(&mut self, distinct_attribute: String) {
         self.distinct_attribute = Setting::Set(distinct_attribute);
     }
 
-    pub fn reset_distinct_attribute(&mut self) {
+    pub fn reset_synonyms(&mut self) {
-        self.distinct_attribute = Setting::Reset;
+        self.synonyms = Setting::Reset;
+    }
+
+    pub fn set_synonyms(&mut self, synonyms: HashMap<String, Vec<String>>) {
+        self.synonyms = if synonyms.is_empty() {
+            Setting::Reset
+        } else {
+            Setting::Set(synonyms)
+        }
     }
 
     fn reindex<F>(&mut self, cb: &F, old_fields_ids_map: FieldsIdsMap) -> anyhow::Result<()>
@@ -294,7 +309,7 @@ impl<'a, 't, 'u, 'i> Settings<'a, 't, 'u, 'i> {
                 let current = self.index.stop_words(self.wtxn)?;
                 // since we can't compare a BTreeSet with an FST we are going to convert the
                 // BTreeSet to an FST and then compare bytes per bytes the two FSTs.
-                let fst = fst::Set::from_iter(&*stop_words)?;
+                let fst = fst::Set::from_iter(stop_words)?;
 
                 // Does the new FST differ from the previous one?
                 if current.map_or(true, |current| current.as_fst().as_bytes() != fst.as_fst().as_bytes()) {
@@ -310,6 +325,64 @@ impl<'a, 't, 'u, 'i> Settings<'a, 't, 'u, 'i> {
         }
     }
 
+    fn update_synonyms(&mut self) -> anyhow::Result<bool> {
+        match self.synonyms {
+            Setting::Set(ref synonyms) => {
+                fn normalize(analyzer: &Analyzer<&[u8]>, text: &str) -> Vec<String> {
+                    analyzer
+                        .analyze(text)
+                        .tokens()
+                        .filter_map(|token|
+                            if token.is_word() { Some(token.text().to_string()) } else { None }
+                        )
+                        .collect::<Vec<_>>()
+                }
+
+                let mut config = AnalyzerConfig::default();
+                let stop_words = self.index.stop_words(self.wtxn)?;
+                if let Some(stop_words) = &stop_words {
+                    config.stop_words(stop_words);
+                }
+                let analyzer = Analyzer::new(config);
+
+                let mut new_synonyms = HashMap::new();
+                for (word, synonyms) in synonyms {
+                    // Normalize both the word and associated synonyms.
+                    let normalized_word = normalize(&analyzer, word);
+                    let normalized_synonyms = synonyms
+                        .iter()
+                        .map(|synonym| normalize(&analyzer, synonym));
+
+                    // Store the normalized synonyms under the normalized word,
+                    // merging the possible duplicate words.
+                    let entry = new_synonyms
+                        .entry(normalized_word)
+                        .or_insert_with(Vec::new);
+                    entry.extend(normalized_synonyms);
+                }
+
+                // Make sure that we don't have duplicate synonyms.
+                new_synonyms
+                    .iter_mut()
+                    .for_each(|(_, synonyms)| {
+                        synonyms.sort_unstable();
+                        synonyms.dedup();
+                    });
+
+                let old_synonyms = self.index.synonyms(self.wtxn)?;
+
+                if new_synonyms != old_synonyms {
+                    self.index.put_synonyms(self.wtxn, &new_synonyms)?;
+                    Ok(true)
+                } else {
+                    Ok(false)
+                }
+            }
+            Setting::Reset => Ok(self.index.delete_synonyms(self.wtxn)?),
+            Setting::NotSet => Ok(false),
+        }
+    }
+
     fn update_facets(&mut self) -> anyhow::Result<bool> {
         match self.faceted_fields {
             Setting::Set(ref fields) => {
@@ -359,9 +432,10 @@ impl<'a, 't, 'u, 'i> Settings<'a, 't, 'u, 'i> {
         // update_criteria MUST be called after update_facets, since criterion fields must be set
         // as facets.
         self.update_criteria()?;
+        let synonyms_updated = self.update_synonyms()?;
         let searchable_updated = self.update_searchable()?;
 
-        if facets_updated || searchable_updated || stop_words_updated {
+        if stop_words_updated || facets_updated || synonyms_updated || searchable_updated {
             self.reindex(&progress_callback, old_fields_ids_map)?;
         }
         Ok(())
@@ -669,6 +743,64 @@ mod tests {
         assert_eq!(result.documents_ids.len(), 1); // there is one benoit in our data
     }
 
+    #[test]
+    fn set_and_reset_synonyms() {
+        let path = tempfile::tempdir().unwrap();
+        let mut options = EnvOpenOptions::new();
+        options.map_size(10 * 1024 * 1024); // 10 MB
+        let index = Index::new(options, &path).unwrap();
+
+        // Send 3 documents with ids from 1 to 3.
+        let mut wtxn = index.write_txn().unwrap();
+        let content = &b"name,age,maxim\nkevin,23,I love dogs\nkevina,21,Doggos are the best\nbenoit,34,The crepes are really good\n"[..];
+        let mut builder = IndexDocuments::new(&mut wtxn, &index, 0);
+        builder.update_format(UpdateFormat::Csv);
+        builder.execute(content, |_, _| ()).unwrap();
+
+        // In the same transaction provide some synonyms
+        let mut builder = Settings::new(&mut wtxn, &index, 0);
+        builder.set_synonyms(hashmap! {
+            "blini".to_string() => vec!["crepes".to_string()],
+            "super like".to_string() => vec!["love".to_string()],
+            "puppies".to_string() => vec!["dogs".to_string(), "doggos".to_string()]
+        });
+        builder.execute(|_, _| ()).unwrap();
+        wtxn.commit().unwrap();
+
+        // Ensure synonyms are effectively stored
+        let rtxn = index.read_txn().unwrap();
+        let synonyms = index.synonyms(&rtxn).unwrap();
+        assert!(!synonyms.is_empty()); // at this point the index should return something
+
+        // Check that we can use synonyms
+        let result = index.search(&rtxn).query("blini").execute().unwrap();
+        assert_eq!(result.documents_ids.len(), 1);
+        let result = index.search(&rtxn).query("super like").execute().unwrap();
+        assert_eq!(result.documents_ids.len(), 1);
+        let result = index.search(&rtxn).query("puppies").execute().unwrap();
+        assert_eq!(result.documents_ids.len(), 2);
+
+        // Reset the synonyms
+        let mut wtxn = index.write_txn().unwrap();
+        let mut builder = Settings::new(&mut wtxn, &index, 0);
+        builder.reset_synonyms();
+        builder.execute(|_, _| ()).unwrap();
+        wtxn.commit().unwrap();
+
+        // Ensure synonyms are reset
+        let rtxn = index.read_txn().unwrap();
+        let synonyms = index.synonyms(&rtxn).unwrap();
+        assert!(synonyms.is_empty());
+
+        // Check that synonyms are no longer work
+        let result = index.search(&rtxn).query("blini").execute().unwrap();
+        assert!(result.documents_ids.is_empty());
+        let result = index.search(&rtxn).query("super like").execute().unwrap();
+        assert!(result.documents_ids.is_empty());
+        let result = index.search(&rtxn).query("puppies").execute().unwrap();
+        assert!(result.documents_ids.is_empty());
+    }
+
     #[test]
     fn setting_searchable_recomputes_other_settings() {
         let path = tempfile::tempdir().unwrap();