Merge #4304

4304: Add CUDA GPU support for Hugging Face embedders r=Kerollmops a=dureuill

Adds a "cuda" feature to `milli`.

Compiling with this feature requires that the CUDA support library be installed (see "with CUDA support" paragraph in https://huggingface.github.io/candle/guide/installation.html), and adds CUDA support to the `huggingFace` embedder.

To enable GPU support, users will need to:

1. Have a compatible NVidia GPU under Linux
2. Follow [the guide](https://huggingface.github.io/candle/guide/installation.html) to install the CUDA dependencies
3. Compile Meilisearch with the `cuda` feature: `cargo build --release --features cuda`

# Impact

Enabling the CUDA feature allows to use an available GPU to compute embeddings with a `huggingFace` embedder. 
On an AWS Graviton 2, this yields a x3 - x5 improvement on indexing time.

# Technical details

- I had to change the CI so that the cuda feature is not included in the `Tests all features` workflow
- To achieve that, I had to add a binary following the `cargo xtask` design pattern, to list all features excepted the cuda one.
- I then changed the workflow accordingly (renamed to "Tests almost all features" 😉)
- A test run of the new feature was done on a temporary version of this PR that had it enabled for PRs: [See the results here](https://github.com/meilisearch/meilisearch/actions/runs/7461331929/job/20301216732)

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

.cargo/config.toml

@@ -0,0 +1,2 @@
+[alias]
+xtask = "run --package xtask --"

.github/workflows/test-suite.yml

@@ -82,7 +82,7 @@ jobs:
           args: --locked --release --all
 
   test-all-features:
-    name: Tests all features
+    name: Tests almost all features
     runs-on: ubuntu-latest
     container:
       # Use ubuntu-18.04 to compile with glibc 2.27, which are the production expectations
@@ -98,16 +98,12 @@ jobs:
         with:
           toolchain: stable
           override: true
-      - name: Run cargo build with all features
-        uses: actions-rs/cargo@v1
-        with:
-          command: build
-          args: --workspace --locked --release --all-features
-      - name: Run cargo test with all features
-        uses: actions-rs/cargo@v1
-        with:
-          command: test
-          args: --workspace --locked --release --all-features
+      - name: Run cargo build with almost all features
+        run: |
+          cargo build --workspace --locked --release --features "$(cargo xtask list-features --exclude-feature cuda)"
+      - name: Run cargo test with almost all features
+        run: |
+          cargo test --workspace --locked --release --features "$(cargo xtask list-features --exclude-feature cuda)"
 
   test-disabled-tokenization:
     name: Test disabled tokenization

CONTRIBUTING.md

@@ -75,6 +75,12 @@ If you get a "Too many open files" error you might want to increase the open fil
 ulimit -Sn 3000
 ```
 
+#### Build tools
+
+Meilisearch follows the [cargo xtask](https://github.com/matklad/cargo-xtask) workflow to provide some build tools.
+
+Run `cargo xtask --help` from the root of the repository to find out what is available.
+
 ## Git Guidelines
 
 ### Git Branches

Cargo.lock

@@ -700,12 +700,23 @@ dependencies = [
  "displaydoc",
 ]
 
+[[package]]
+name = "camino"
+version = "1.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c59e92b5a388f549b863a7bea62612c09f24c8393560709a54558a9abdfb3b9c"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "candle-core"
 version = "0.3.3"
 source = "git+https://github.com/huggingface/candle.git#5270224f407502b82fe90bc2622894ce3871b002"
 dependencies = [
  "byteorder",
+ "candle-kernels",
+ "cudarc",
  "gemm",
  "half 2.3.1",
  "memmap2 0.9.3",
@@ -720,6 +731,16 @@ dependencies = [
  "zip",
 ]
 
+[[package]]
+name = "candle-kernels"
+version = "0.3.1"
+source = "git+https://github.com/huggingface/candle.git#f4fcf6090045ac44122fd5f0a7e46db6e3e16528"
+dependencies = [
+ "anyhow",
+ "glob",
+ "rayon",
+]
+
 [[package]]
 name = "candle-nn"
 version = "0.3.3"
@@ -752,6 +773,29 @@ dependencies = [
  "wav",
 ]
 
+[[package]]
+name = "cargo-platform"
+version = "0.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ceed8ef69d8518a5dda55c07425450b58a4e1946f4951eab6d7191ee86c2443d"
+dependencies = [
+ "serde",
+]
+
+[[package]]
+name = "cargo_metadata"
+version = "0.18.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2d886547e41f740c616ae73108f6eb70afe6d940c7bc697cb30f13daec073037"
+dependencies = [
+ "camino",
+ "cargo-platform",
+ "semver",
+ "serde",
+ "serde_json",
+ "thiserror",
+]
+
 [[package]]
 name = "cargo_toml"
 version = "0.18.0"
@@ -1163,6 +1207,15 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "cudarc"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9395df0cab995685664e79cc35ad6302bf08fb9c5d82301875a183affe1278b1"
+dependencies = [
+ "half 2.3.1",
+]
+
 [[package]]
 name = "darling"
 version = "0.14.4"
@@ -4827,6 +4880,9 @@ name = "semver"
 version = "1.0.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b0293b4b29daaf487284529cc2f5675b8e57c61f70167ba415a463651fd6a918"
+dependencies = [
+ "serde",
+]
 
 [[package]]
 name = "seq-macro"
@@ -6174,6 +6230,14 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "xtask"
+version = "1.6.0"
+dependencies = [
+ "cargo_metadata",
+ "clap",
+]
+
 [[package]]
 name = "yada"
 version = "0.5.0"

Cargo.toml

@@ -16,6 +16,7 @@ members = [
     "json-depth-checker",
     "benchmarks",
     "fuzzers",
+    "xtask",
 ]
 
 [workspace.package]

milli/Cargo.toml

@@ -137,3 +137,6 @@ greek = ["charabia/greek"]
 
 # allow khmer specialized tokenization
 khmer = ["charabia/khmer"]
+
+# allow CUDA support, see <https://github.com/meilisearch/meilisearch/issues/4306>
+cuda = ["candle-core/cuda"]

milli/src/vector/hf.rs

@@ -70,7 +70,13 @@ impl std::fmt::Debug for Embedder {
 
 impl Embedder {
     pub fn new(options: EmbedderOptions) -> std::result::Result<Self, NewEmbedderError> {
-        let device = candle_core::Device::Cpu;
+        let device = match candle_core::Device::cuda_if_available(0) {
+            Ok(device) => device,
+            Err(error) => {
+                log::warn!("could not initialize CUDA device for Hugging Face embedder, defaulting to CPU: {}", error);
+                candle_core::Device::Cpu
+            }
+        };
         let repo = match options.revision.clone() {
             Some(revision) => Repo::with_revision(options.model.clone(), RepoType::Model, revision),
             None => Repo::model(options.model.clone()),

xtask/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "xtask"
+version.workspace = true
+authors.workspace = true
+description = "Workspace automation tool following the xtask pattern <https://github.com/matklad/cargo-xtask>"
+homepage.workspace = true
+readme.workspace = true
+edition.workspace = true
+license.workspace = true
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+cargo_metadata = "0.18.1"
+clap = { version = "4.4.14", features = ["derive"] }

xtask/src/main.rs

@@ -0,0 +1,41 @@
+use std::collections::HashSet;
+
+use clap::Parser;
+
+/// List features available in the workspace
+#[derive(Parser, Debug)]
+struct ListFeaturesDeriveArgs {
+    /// Feature to exclude from the list. Repeat the argument to exclude multiple features
+    #[arg(short, long)]
+    exclude_feature: Vec<String>,
+}
+
+/// Utilitary commands
+#[derive(Parser, Debug)]
+#[command(author, version, about, long_about)]
+#[command(name = "cargo xtask")]
+#[command(bin_name = "cargo xtask")]
+enum Command {
+    ListFeatures(ListFeaturesDeriveArgs),
+}
+
+fn main() {
+    let args = Command::parse();
+    match args {
+        Command::ListFeatures(args) => list_features(args),
+    }
+}
+
+fn list_features(args: ListFeaturesDeriveArgs) {
+    let exclude_features: HashSet<_> = args.exclude_feature.into_iter().collect();
+    let metadata = cargo_metadata::MetadataCommand::new().no_deps().exec().unwrap();
+    let features: Vec<String> = metadata
+        .packages
+        .iter()
+        .flat_map(|package| package.features.keys())
+        .filter(|feature| !exclude_features.contains(feature.as_str()))
+        .map(|s| s.to_owned())
+        .collect();
+    let features = features.join(" ");
+    println!("{features}")
+}