Merge #4801

4801: AI quality-of-life improvements r=irevoire a=dureuill

# Pull Request

## Related issue
Fixes #4802 

## What does this PR do?
This PR implements several quality-of-life improvements described in the [public usage](https://meilisearch.notion.site/v1-10-AI-search-changes-737c9d7d010d4dd685582bf5dab579e2#ece824a1814e47a0a986d786baff1be9)


Co-authored-by: Louis Dureuil <louis@meilisearch.com>

meilisearch-types/src/error.rs

@@ -415,7 +415,9 @@ impl ErrorCode for milli::Error {
                         Code::InvalidSettingsTypoTolerance
                     }
                     UserError::InvalidEmbedder(_) => Code::InvalidEmbedder,
-                    UserError::VectorEmbeddingError(_) => Code::VectorEmbeddingError,
+                    UserError::VectorEmbeddingError(_) | UserError::DocumentEmbeddingError(_) => {
+                        Code::VectorEmbeddingError
+                    }
                     UserError::DocumentEditionCannotModifyPrimaryKey
                     | UserError::DocumentEditionDocumentMustBeObject
                     | UserError::DocumentEditionRuntimeError(_)

meilisearch/tests/documents/get_documents.rs

@@ -645,7 +645,12 @@ async fn get_document_with_vectors() {
         {
           "id": 1,
           "name": "echo",
-          "_vectors": {}
+          "_vectors": {
+            "manual": {
+              "embeddings": [],
+              "regenerate": false
+            }
+          }
         }
       ],
       "offset": 0,
@@ -701,7 +706,12 @@ async fn get_document_with_vectors() {
         },
         {
           "name": "echo",
-          "_vectors": {}
+          "_vectors": {
+            "manual": {
+              "embeddings": [],
+              "regenerate": false
+            }
+          }
         }
       ],
       "offset": 0,

meilisearch/tests/vector/mod.rs

@@ -120,7 +120,12 @@ async fn add_remove_user_provided() {
         {
           "id": 1,
           "name": "echo",
-          "_vectors": {}
+          "_vectors": {
+            "manual": {
+              "embeddings": [],
+              "regenerate": false
+            }
+          }
         }
       ],
       "offset": 0,
@@ -142,7 +147,12 @@ async fn add_remove_user_provided() {
         {
           "id": 1,
           "name": "echo",
-          "_vectors": {}
+          "_vectors": {
+            "manual": {
+              "embeddings": [],
+              "regenerate": false
+            }
+          }
         }
       ],
       "offset": 0,
@@ -471,6 +481,99 @@ async fn user_provided_embeddings_error() {
     "###);
 }
 
+#[actix_rt::test]
+async fn user_provided_vectors_error() {
+    let server = Server::new().await;
+    let index = generate_default_user_provided_documents(&server).await;
+
+    // First case, we forget to specify `_vectors`
+    let documents = json!({"id": 42, "name": "kefir"});
+    let (value, code) = index.add_documents(documents, None).await;
+    snapshot!(code, @"202 Accepted");
+    let task = index.wait_task(value.uid()).await;
+    snapshot!(task, @r###"
+    {
+      "uid": 2,
+      "indexUid": "doggo",
+      "status": "failed",
+      "type": "documentAdditionOrUpdate",
+      "canceledBy": null,
+      "details": {
+        "receivedDocuments": 1,
+        "indexedDocuments": 0
+      },
+      "error": {
+        "message": "While embedding documents for embedder `manual`: user error: attempt to embed the following text in a configuration where embeddings must be user provided: \" id: 42\\n name: kefir\\n _vectors: \\n _vectors.manual: \\n _vectors.manual.regenerate: \\n _vectors.manual.embeddings: \\n\"\n- Note: `manual` has `source: userProvided`, so documents must provide embeddings as an array in `_vectors.manual`.\n- Hint: opt-out for a document with `_vectors.manual: null`",
+        "code": "vector_embedding_error",
+        "type": "invalid_request",
+        "link": "https://docs.meilisearch.com/errors#vector_embedding_error"
+      },
+      "duration": "[duration]",
+      "enqueuedAt": "[date]",
+      "startedAt": "[date]",
+      "finishedAt": "[date]"
+    }
+    "###);
+
+    // Second case, we provide `_vectors` with a typo
+    let documents = json!({"id": 42, "name": "kefir", "_vector": { "manaul": [0, 0, 0] }});
+    let (value, code) = index.add_documents(documents, None).await;
+    snapshot!(code, @"202 Accepted");
+    let task = index.wait_task(value.uid()).await;
+    snapshot!(task, @r###"
+    {
+      "uid": 3,
+      "indexUid": "doggo",
+      "status": "failed",
+      "type": "documentAdditionOrUpdate",
+      "canceledBy": null,
+      "details": {
+        "receivedDocuments": 1,
+        "indexedDocuments": 0
+      },
+      "error": {
+        "message": "While embedding documents for embedder `manual`: user error: attempt to embed the following text in a configuration where embeddings must be user provided: \" id: 42\\n name: kefir\\n _vectors: \\n _vectors.manual: \\n _vectors.manual.regenerate: \\n _vectors.manual.embeddings: \\n _vector: manaul000\\n _vector.manaul: \\n\"\n- Note: `manual` has `source: userProvided`, so documents must provide embeddings as an array in `_vectors.manual`.\n- Hint: try replacing `_vector` by `_vectors` in 1 document(s).",
+        "code": "vector_embedding_error",
+        "type": "invalid_request",
+        "link": "https://docs.meilisearch.com/errors#vector_embedding_error"
+      },
+      "duration": "[duration]",
+      "enqueuedAt": "[date]",
+      "startedAt": "[date]",
+      "finishedAt": "[date]"
+    }
+    "###);
+
+    // Third case, we specify the embedder with a typo
+    let documents = json!({"id": 42, "name": "kefir", "_vectors": { "manaul": [0, 0, 0] }});
+    let (value, code) = index.add_documents(documents, None).await;
+    snapshot!(code, @"202 Accepted");
+    let task = index.wait_task(value.uid()).await;
+    snapshot!(task, @r###"
+    {
+      "uid": 4,
+      "indexUid": "doggo",
+      "status": "failed",
+      "type": "documentAdditionOrUpdate",
+      "canceledBy": null,
+      "details": {
+        "receivedDocuments": 1,
+        "indexedDocuments": 0
+      },
+      "error": {
+        "message": "While embedding documents for embedder `manual`: user error: attempt to embed the following text in a configuration where embeddings must be user provided: \" id: 42\\n name: kefir\\n _vectors: manaul000\\n _vectors.manual: \\n _vectors.manual.regenerate: \\n _vectors.manual.embeddings: \\n _vectors.manaul: \\n\"\n- Note: `manual` has `source: userProvided`, so documents must provide embeddings as an array in `_vectors.manual`.\n- Hint: try replacing `_vectors.manaul` by `_vectors.manual` in 1 document(s).",
+        "code": "vector_embedding_error",
+        "type": "invalid_request",
+        "link": "https://docs.meilisearch.com/errors#vector_embedding_error"
+      },
+      "duration": "[duration]",
+      "enqueuedAt": "[date]",
+      "startedAt": "[date]",
+      "finishedAt": "[date]"
+    }
+    "###);
+}
+
 #[actix_rt::test]
 async fn clear_documents() {
     let server = Server::new().await;
@@ -580,7 +683,12 @@ async fn add_remove_one_vector_4588() {
         {
           "id": 0,
           "name": "kefir",
-          "_vectors": {}
+          "_vectors": {
+            "manual": {
+              "embeddings": [],
+              "regenerate": false
+            }
+          }
         }
       ],
       "offset": 0,

milli/src/error.rs

@@ -268,15 +268,17 @@ only composed of alphanumeric characters (a-z A-Z 0-9), hyphens (-) and undersco
     DocumentEditionRuntimeError(Box<EvalAltResult>),
     #[error("Document edition runtime error encountered while compiling the function: {0}")]
     DocumentEditionCompilationError(rhai::ParseError),
+    #[error("{0}")]
+    DocumentEmbeddingError(String),
 }
 
 impl From<crate::vector::Error> for Error {
     fn from(value: crate::vector::Error) -> Self {
         match value.fault() {
             FaultSource::User => Error::UserError(value.into()),
-            FaultSource::Runtime => Error::InternalError(value.into()),
+            FaultSource::Runtime => Error::UserError(value.into()),
             FaultSource::Bug => Error::InternalError(value.into()),
-            FaultSource::Undecided => Error::InternalError(value.into()),
+            FaultSource::Undecided => Error::UserError(value.into()),
         }
     }
 }

milli/src/index.rs

@@ -1691,9 +1691,7 @@ impl Index {
                 }
             }
 
-            if !embeddings.is_empty() {
+            res.insert(embedder_name.to_owned(), embeddings);
-                res.insert(embedder_name.to_owned(), embeddings);
-            }
         }
         Ok(res)
     }

milli/src/update/index_documents/extract/extract_vector_points.rs

@@ -13,13 +13,15 @@ use roaring::RoaringBitmap;
 use serde_json::Value;
 
 use super::helpers::{create_writer, writer_into_reader, GrenadParameters};
+use crate::error::FaultSource;
 use crate::index::IndexEmbeddingConfig;
 use crate::prompt::Prompt;
 use crate::update::del_add::{DelAdd, KvReaderDelAdd, KvWriterDelAdd};
 use crate::update::settings::InnerIndexSettingsDiff;
+use crate::vector::error::{EmbedErrorKind, PossibleEmbeddingMistakes, UnusedVectorsDistribution};
 use crate::vector::parsed_vectors::{ParsedVectorsDiff, VectorState, RESERVED_VECTORS_FIELD_NAME};
 use crate::vector::settings::{EmbedderAction, ReindexAction};
-use crate::vector::Embedder;
+use crate::vector::{Embedder, Embeddings};
 use crate::{try_split_array_at, DocumentId, FieldId, FieldsIdsMap, Result, ThreadPoolNoAbort};
 
 /// The length of the elements that are always in the buffer when inserting new values.
@@ -102,7 +104,8 @@ pub fn extract_vector_points<R: io::Read + io::Seek>(
     indexer: GrenadParameters,
     embedders_configs: &[IndexEmbeddingConfig],
     settings_diff: &InnerIndexSettingsDiff,
-) -> Result<Vec<ExtractedVectorPoints>> {
+) -> Result<(Vec<ExtractedVectorPoints>, UnusedVectorsDistribution)> {
+    let mut unused_vectors_distribution = UnusedVectorsDistribution::new();
     let reindex_vectors = settings_diff.reindex_vectors();
 
     let old_fields_ids_map = &settings_diff.old.fields_ids_map;
@@ -319,6 +322,8 @@ pub fn extract_vector_points<R: io::Read + io::Seek>(
                 delta,
             )?;
         }
+
+        unused_vectors_distribution.append(parsed_vectors);
     }
 
     let mut results = Vec::new();
@@ -355,7 +360,7 @@ pub fn extract_vector_points<R: io::Read + io::Seek>(
         })
     }
 
-    Ok(results)
+    Ok((results, unused_vectors_distribution))
 }
 
 fn extract_vector_document_diff(
@@ -547,6 +552,9 @@ pub fn extract_embeddings<R: io::Read + io::Seek>(
     prompt_reader: grenad::Reader<R>,
     indexer: GrenadParameters,
     embedder: Arc<Embedder>,
+    embedder_name: &str,
+    possible_embedding_mistakes: &PossibleEmbeddingMistakes,
+    unused_vectors_distribution: &UnusedVectorsDistribution,
     request_threads: &ThreadPoolNoAbort,
 ) -> Result<grenad::Reader<BufReader<File>>> {
     let n_chunks = embedder.chunk_count_hint(); // chunk level parallelism
@@ -583,13 +591,14 @@ pub fn extract_embeddings<R: io::Read + io::Seek>(
         current_chunk_ids.push(docid);
 
         if chunks.len() == chunks.capacity() {
-            let chunked_embeds = embedder
+            let chunked_embeds = embed_chunks(
-                .embed_chunks(
+                &embedder,
-                    std::mem::replace(&mut chunks, Vec::with_capacity(n_chunks)),
+                std::mem::replace(&mut chunks, Vec::with_capacity(n_chunks)),
-                    request_threads,
+                embedder_name,
-                )
+                possible_embedding_mistakes,
-                .map_err(crate::vector::Error::from)
+                unused_vectors_distribution,
-                .map_err(crate::Error::from)?;
+                request_threads,
+            )?;
 
             for (docid, embeddings) in chunks_ids
                 .iter()
@@ -604,10 +613,14 @@ pub fn extract_embeddings<R: io::Read + io::Seek>(
 
     // send last chunk
     if !chunks.is_empty() {
-        let chunked_embeds = embedder
+        let chunked_embeds = embed_chunks(
-            .embed_chunks(std::mem::take(&mut chunks), request_threads)
+            &embedder,
-            .map_err(crate::vector::Error::from)
+            std::mem::take(&mut chunks),
-            .map_err(crate::Error::from)?;
+            embedder_name,
+            possible_embedding_mistakes,
+            unused_vectors_distribution,
+            request_threads,
+        )?;
         for (docid, embeddings) in chunks_ids
             .iter()
             .flat_map(|docids| docids.iter())
@@ -618,10 +631,14 @@ pub fn extract_embeddings<R: io::Read + io::Seek>(
     }
 
     if !current_chunk.is_empty() {
-        let embeds = embedder
+        let embeds = embed_chunks(
-            .embed_chunks(vec![std::mem::take(&mut current_chunk)], request_threads)
+            &embedder,
-            .map_err(crate::vector::Error::from)
+            vec![std::mem::take(&mut current_chunk)],
-            .map_err(crate::Error::from)?;
+            embedder_name,
+            possible_embedding_mistakes,
+            unused_vectors_distribution,
+            request_threads,
+        )?;
 
         if let Some(embeds) = embeds.first() {
             for (docid, embeddings) in current_chunk_ids.iter().zip(embeds.iter()) {
@@ -632,3 +649,57 @@ pub fn extract_embeddings<R: io::Read + io::Seek>(
 
     writer_into_reader(state_writer)
 }
+
+fn embed_chunks(
+    embedder: &Embedder,
+    text_chunks: Vec<Vec<String>>,
+    embedder_name: &str,
+    possible_embedding_mistakes: &PossibleEmbeddingMistakes,
+    unused_vectors_distribution: &UnusedVectorsDistribution,
+    request_threads: &ThreadPoolNoAbort,
+) -> Result<Vec<Vec<Embeddings<f32>>>> {
+    match embedder.embed_chunks(text_chunks, request_threads) {
+        Ok(chunks) => Ok(chunks),
+        Err(error) => {
+            if let FaultSource::Bug = error.fault {
+                Err(crate::Error::InternalError(crate::InternalError::VectorEmbeddingError(
+                    error.into(),
+                )))
+            } else {
+                let mut msg =
+                    format!(r"While embedding documents for embedder `{embedder_name}`: {error}");
+
+                if let EmbedErrorKind::ManualEmbed(_) = &error.kind {
+                    msg += &format!("\n- Note: `{embedder_name}` has `source: userProvided`, so documents must provide embeddings as an array in `_vectors.{embedder_name}`.");
+                }
+
+                let mut hint_count = 0;
+
+                for (vector_misspelling, count) in
+                    possible_embedding_mistakes.vector_mistakes().take(2)
+                {
+                    msg += &format!("\n- Hint: try replacing `{vector_misspelling}` by `_vectors` in {count} document(s).");
+                    hint_count += 1;
+                }
+
+                for (embedder_misspelling, count) in possible_embedding_mistakes
+                    .embedder_mistakes(embedder_name, unused_vectors_distribution)
+                    .take(2)
+                {
+                    msg += &format!("\n- Hint: try replacing `_vectors.{embedder_misspelling}` by `_vectors.{embedder_name}` in {count} document(s).");
+                    hint_count += 1;
+                }
+
+                if hint_count == 0 {
+                    if let EmbedErrorKind::ManualEmbed(_) = &error.kind {
+                        msg += &format!(
+                            "\n- Hint: opt-out for a document with `_vectors.{embedder_name}: null`"
+                        );
+                    }
+                }
+
+                Err(crate::Error::UserError(crate::UserError::DocumentEmbeddingError(msg)))
+            }
+        }
+    }
+}

milli/src/update/index_documents/extract/mod.rs

@@ -32,6 +32,7 @@ use super::helpers::{as_cloneable_grenad, CursorClonableMmap, GrenadParameters};
 use super::{helpers, TypedChunk};
 use crate::index::IndexEmbeddingConfig;
 use crate::update::settings::InnerIndexSettingsDiff;
+use crate::vector::error::PossibleEmbeddingMistakes;
 use crate::{FieldId, Result, ThreadPoolNoAbort, ThreadPoolNoAbortBuilder};
 
 /// Extract data for each databases from obkv documents in parallel.
@@ -47,6 +48,7 @@ pub(crate) fn data_from_obkv_documents(
     embedders_configs: Arc<Vec<IndexEmbeddingConfig>>,
     settings_diff: Arc<InnerIndexSettingsDiff>,
     max_positions_per_attributes: Option<u32>,
+    possible_embedding_mistakes: Arc<PossibleEmbeddingMistakes>,
 ) -> Result<()> {
     let (original_pipeline_result, flattened_pipeline_result): (Result<_>, Result<_>) = rayon::join(
         || {
@@ -59,6 +61,7 @@ pub(crate) fn data_from_obkv_documents(
                         lmdb_writer_sx.clone(),
                         embedders_configs.clone(),
                         settings_diff.clone(),
+                        possible_embedding_mistakes.clone(),
                     )
                 })
                 .collect::<Result<()>>()
@@ -227,6 +230,7 @@ fn send_original_documents_data(
     lmdb_writer_sx: Sender<Result<TypedChunk>>,
     embedders_configs: Arc<Vec<IndexEmbeddingConfig>>,
     settings_diff: Arc<InnerIndexSettingsDiff>,
+    possible_embedding_mistakes: Arc<PossibleEmbeddingMistakes>,
 ) -> Result<()> {
     let original_documents_chunk =
         original_documents_chunk.and_then(|c| unsafe { as_cloneable_grenad(&c) })?;
@@ -248,7 +252,7 @@ fn send_original_documents_data(
                 &embedders_configs,
                 &settings_diff,
             ) {
-                Ok(extracted_vectors) => {
+                Ok((extracted_vectors, unused_vectors_distribution)) => {
                     for ExtractedVectorPoints {
                         manual_vectors,
                         remove_vectors,
@@ -263,6 +267,9 @@ fn send_original_documents_data(
                             prompts,
                             indexer,
                             embedder.clone(),
+                            &embedder_name,
+                            &possible_embedding_mistakes,
+                            &unused_vectors_distribution,
                             request_threads(),
                         ) {
                             Ok(results) => Some(results),

milli/src/update/index_documents/mod.rs

@@ -427,6 +427,9 @@ where
         let settings_diff = Arc::new(settings_diff);
         let embedders_configs = Arc::new(self.index.embedding_configs(self.wtxn)?);
 
+        let possible_embedding_mistakes =
+            crate::vector::error::PossibleEmbeddingMistakes::new(&field_distribution);
+
         let backup_pool;
         let pool = match self.indexer_config.thread_pool {
             Some(ref pool) => pool,
@@ -542,6 +545,7 @@ where
                         embedders_configs.clone(),
                         settings_diff_cloned,
                         max_positions_per_attributes,
+                        Arc::new(possible_embedding_mistakes)
                     )
                 });
 

milli/src/update/settings.rs

@@ -1574,7 +1574,6 @@ pub fn validate_embedding_settings(
         EmbedderSource::OpenAi => {
             check_unset(&revision, EmbeddingSettings::REVISION, inferred_source, name)?;
 
-            check_unset(&url, EmbeddingSettings::URL, inferred_source, name)?;
             check_unset(&query, EmbeddingSettings::QUERY, inferred_source, name)?;
             check_unset(&input_field, EmbeddingSettings::INPUT_FIELD, inferred_source, name)?;
             check_unset(

milli/src/vector/error.rs

@@ -1,9 +1,11 @@
+use std::collections::BTreeMap;
 use std::path::PathBuf;
 
 use hf_hub::api::sync::ApiError;
 
+use super::parsed_vectors::ParsedVectorsDiff;
 use crate::error::FaultSource;
-use crate::PanicCatched;
+use crate::{FieldDistribution, PanicCatched};
 
 #[derive(Debug, thiserror::Error)]
 #[error("Error while generating embeddings: {inner}")]
@@ -310,3 +312,68 @@ pub enum NewEmbedderErrorKind {
     #[error("loading model failed: {0}")]
     LoadModel(candle_core::Error),
 }
+
+pub struct PossibleEmbeddingMistakes {
+    vectors_mistakes: BTreeMap<String, u64>,
+}
+
+impl PossibleEmbeddingMistakes {
+    pub fn new(field_distribution: &FieldDistribution) -> Self {
+        let mut vectors_mistakes = BTreeMap::new();
+        let builder = levenshtein_automata::LevenshteinAutomatonBuilder::new(2, true);
+        let automata = builder.build_dfa("_vectors");
+        for (field, count) in field_distribution {
+            if *count == 0 {
+                continue;
+            }
+            if field.contains('.') {
+                continue;
+            }
+            match automata.eval(field) {
+                levenshtein_automata::Distance::Exact(0) => continue,
+                levenshtein_automata::Distance::Exact(_) => {
+                    vectors_mistakes.insert(field.to_string(), *count);
+                }
+                levenshtein_automata::Distance::AtLeast(_) => continue,
+            }
+        }
+
+        Self { vectors_mistakes }
+    }
+
+    pub fn vector_mistakes(&self) -> impl Iterator<Item = (&str, u64)> {
+        self.vectors_mistakes.iter().map(|(misspelling, count)| (misspelling.as_str(), *count))
+    }
+
+    pub fn embedder_mistakes<'a>(
+        &'a self,
+        embedder_name: &'a str,
+        unused_vectors_distributions: &'a UnusedVectorsDistribution,
+    ) -> impl Iterator<Item = (&'a str, u64)> + 'a {
+        let builder = levenshtein_automata::LevenshteinAutomatonBuilder::new(2, true);
+        let automata = builder.build_dfa(embedder_name);
+
+        unused_vectors_distributions.0.iter().filter_map(move |(field, count)| {
+            match automata.eval(field) {
+                levenshtein_automata::Distance::Exact(0) => None,
+                levenshtein_automata::Distance::Exact(_) => Some((field.as_str(), *count)),
+                levenshtein_automata::Distance::AtLeast(_) => None,
+            }
+        })
+    }
+}
+
+#[derive(Default)]
+pub struct UnusedVectorsDistribution(BTreeMap<String, u64>);
+
+impl UnusedVectorsDistribution {
+    pub fn new() -> Self {
+        Self::default()
+    }
+
+    pub fn append(&mut self, parsed_vectors_diff: ParsedVectorsDiff) {
+        for name in parsed_vectors_diff.into_new_vectors_keys_iter() {
+            *self.0.entry(name).or_default() += 1;
+        }
+    }
+}

milli/src/vector/manual.rs

@@ -20,7 +20,7 @@ impl Embedder {
 
     pub fn embed(&self, mut texts: Vec<String>) -> Result<Vec<Embeddings<f32>>, EmbedError> {
         let Some(text) = texts.pop() else { return Ok(Default::default()) };
-        Err(EmbedError::embed_on_manual_embedder(text))
+        Err(EmbedError::embed_on_manual_embedder(text.chars().take(250).collect()))
     }
 
     pub fn dimensions(&self) -> usize {

milli/src/vector/openai.rs

@@ -10,6 +10,7 @@ use crate::ThreadPoolNoAbort;
 
 #[derive(Debug, Clone, Hash, PartialEq, Eq, serde::Deserialize, serde::Serialize)]
 pub struct EmbedderOptions {
+    pub url: Option<String>,
     pub api_key: Option<String>,
     pub embedding_model: EmbeddingModel,
     pub dimensions: Option<usize>,
@@ -146,11 +147,13 @@ pub const OPENAI_EMBEDDINGS_URL: &str = "https://api.openai.com/v1/embeddings";
 
 impl EmbedderOptions {
     pub fn with_default_model(api_key: Option<String>) -> Self {
-        Self { api_key, embedding_model: Default::default(), dimensions: None, distribution: None }
+        Self {
-    }
+            api_key,
-
+            embedding_model: Default::default(),
-    pub fn with_embedding_model(api_key: Option<String>, embedding_model: EmbeddingModel) -> Self {
+            dimensions: None,
-        Self { api_key, embedding_model, dimensions: None, distribution: None }
+            distribution: None,
+            url: None,
+        }
     }
 }
 
@@ -175,11 +178,13 @@ impl Embedder {
             &inferred_api_key
         });
 
+        let url = options.url.as_deref().unwrap_or(OPENAI_EMBEDDINGS_URL).to_owned();
+
         let rest_embedder = RestEmbedder::new(RestEmbedderOptions {
             api_key: Some(api_key.clone()),
             distribution: None,
             dimensions: Some(options.dimensions()),
-            url: OPENAI_EMBEDDINGS_URL.to_owned(),
+            url,
             query: options.query(),
             input_field: vec!["input".to_owned()],
             input_type: crate::vector::rest::InputType::TextArray,
@@ -205,7 +210,6 @@ impl Embedder {
     }
 
     fn try_embed_tokenized(&self, text: &[String]) -> Result<Vec<Embeddings<f32>>, EmbedError> {
-        pub const OVERLAP_SIZE: usize = 200;
         let mut all_embeddings = Vec::with_capacity(text.len());
         for text in text {
             let max_token_count = self.options.embedding_model.max_token();
@@ -216,21 +220,10 @@ impl Embedder {
                 continue;
             }
 
-            let mut tokens = encoded.as_slice();
+            let tokens = &encoded.as_slice()[0..max_token_count];
             let mut embeddings_for_prompt = Embeddings::new(self.dimensions());
-            while tokens.len() > max_token_count {
-                let window = &tokens[..max_token_count];
-                let embedding = self.rest_embedder.embed_tokens(window)?;
-                embeddings_for_prompt.append(embedding.into_inner()).map_err(|got| {
-                    EmbedError::openai_unexpected_dimension(self.dimensions(), got.len())
-                })?;
 
-                tokens = &tokens[max_token_count - OVERLAP_SIZE..];
-            }
-
-            // end of text
             let embedding = self.rest_embedder.embed_tokens(tokens)?;
-
             embeddings_for_prompt.append(embedding.into_inner()).map_err(|got| {
                 EmbedError::openai_unexpected_dimension(self.dimensions(), got.len())
             })?;

milli/src/vector/parsed_vectors.rs

@@ -179,6 +179,15 @@ impl ParsedVectorsDiff {
 
         (old, new)
     }
+
+    pub fn into_new_vectors_keys_iter(self) -> impl Iterator<Item = String> {
+        let maybe_it = match self.new {
+            VectorsState::NoVectorsFid => None,
+            VectorsState::NoVectorsFieldInDocument => None,
+            VectorsState::Vectors(vectors) => Some(vectors.into_keys()),
+        };
+        maybe_it.into_iter().flatten()
+    }
 }
 
 pub struct ParsedVectors(pub BTreeMap<String, Vectors>);

milli/src/vector/rest.rs

@@ -1,4 +1,5 @@
 use deserr::Deserr;
+use rand::Rng;
 use rayon::iter::{IntoParallelIterator as _, ParallelIterator as _};
 use serde::{Deserialize, Serialize};
 
@@ -264,7 +265,7 @@ where
         }
     };
 
-    for attempt in 0..7 {
+    for attempt in 0..10 {
         let response = request.clone().send_json(&body);
         let result = check_response(response);
 
@@ -277,6 +278,11 @@ where
         }?;
 
         let retry_duration = retry_duration.min(std::time::Duration::from_secs(60)); // don't wait more than a minute
+
+        // randomly up to double the retry duration
+        let retry_duration = retry_duration
+            + rand::thread_rng().gen_range(std::time::Duration::ZERO..retry_duration);
+
         tracing::warn!("Attempt #{}, retrying after {}ms.", attempt, retry_duration.as_millis());
         std::thread::sleep(retry_duration);
     }

milli/src/vector/settings.rs

@@ -166,7 +166,16 @@ impl SettingsDiff {
                     ReindexAction::push_action(&mut reindex_action, ReindexAction::FullReindex);
                 }
                 if url.apply(new_url) {
-                    ReindexAction::push_action(&mut reindex_action, ReindexAction::FullReindex);
+                    match source {
+                        // do not regenerate on an url change in OpenAI
+                        Setting::Set(EmbedderSource::OpenAi) | Setting::Reset => {}
+                        _ => {
+                            ReindexAction::push_action(
+                                &mut reindex_action,
+                                ReindexAction::FullReindex,
+                            );
+                        }
+                    }
                 }
                 if query.apply(new_query) {
                     ReindexAction::push_action(&mut reindex_action, ReindexAction::FullReindex);
@@ -271,7 +280,7 @@ fn apply_default_for_source(
             *model = Setting::Reset;
             *revision = Setting::NotSet;
             *dimensions = Setting::NotSet;
-            *url = Setting::NotSet;
+            *url = Setting::Reset;
             *query = Setting::NotSet;
             *input_field = Setting::NotSet;
             *path_to_embeddings = Setting::NotSet;
@@ -364,7 +373,7 @@ impl EmbeddingSettings {
                 EmbedderSource::Ollama,
                 EmbedderSource::Rest,
             ],
-            Self::URL => &[EmbedderSource::Ollama, EmbedderSource::Rest],
+            Self::URL => &[EmbedderSource::Ollama, EmbedderSource::Rest, EmbedderSource::OpenAi],
             Self::QUERY => &[EmbedderSource::Rest],
             Self::INPUT_FIELD => &[EmbedderSource::Rest],
             Self::PATH_TO_EMBEDDINGS => &[EmbedderSource::Rest],
@@ -390,6 +399,7 @@ impl EmbeddingSettings {
                 Self::DOCUMENT_TEMPLATE,
                 Self::DIMENSIONS,
                 Self::DISTRIBUTION,
+                Self::URL,
             ],
             EmbedderSource::HuggingFace => &[
                 Self::SOURCE,
@@ -494,6 +504,7 @@ impl From<EmbeddingConfig> for EmbeddingSettings {
                 distribution: distribution.map(Setting::Set).unwrap_or_default(),
             },
             super::EmbedderOptions::OpenAi(super::openai::EmbedderOptions {
+                url,
                 api_key,
                 embedding_model,
                 dimensions,
@@ -505,7 +516,7 @@ impl From<EmbeddingConfig> for EmbeddingSettings {
                 api_key: api_key.map(Setting::Set).unwrap_or_default(),
                 dimensions: dimensions.map(Setting::Set).unwrap_or_default(),
                 document_template: Setting::Set(prompt.template),
-                url: Setting::NotSet,
+                url: url.map(Setting::Set).unwrap_or_default(),
                 query: Setting::NotSet,
                 input_field: Setting::NotSet,
                 path_to_embeddings: Setting::NotSet,
@@ -608,6 +619,9 @@ impl From<EmbeddingSettings> for EmbeddingConfig {
                             options.embedding_model = model;
                         }
                     }
+                    if let Some(url) = url.set() {
+                        options.url = Some(url);
+                    }
                     if let Some(api_key) = api_key.set() {
                         options.api_key = Some(api_key);
                     }