VoyageAI embeddings, should end up as a PR for pydantic-ai

haiku_rag_slim/haiku/rag/embeddings/__init__.py

@@ -128,14 +128,15 @@ def get_embedder(config: AppConfig = Config) -> EmbedderWrapper:
 
     if provider == "voyageai":
         try:
-            from haiku.rag.embeddings.voyageai import Embedder as VoyageAIEmbedder
+            from haiku.rag.embeddings.voyageai import VoyageAIEmbeddingModel
         except ImportError:
             raise ImportError(
                 "VoyageAI embedder requires the 'voyageai' package. "
                 "Please install haiku.rag with the 'voyageai' extra: "
                 "uv pip install haiku.rag[voyageai]"
             )
-        return VoyageAIEmbedder(model_name, vector_dim, config)  # type: ignore[return-value]
+        model = VoyageAIEmbeddingModel(model_name)
+        return EmbedderWrapper(Embedder(model), vector_dim)
 
     if provider == "cohere":
         return EmbedderWrapper(Embedder(f"cohere:{model_name}"), vector_dim)

haiku_rag_slim/haiku/rag/embeddings/voyageai.py

@@ -1,33 +1,182 @@
+from collections.abc import Sequence
+from dataclasses import dataclass, field
+from typing import Literal, cast
+
+from pydantic_ai.embeddings.base import EmbeddingModel
+from pydantic_ai.embeddings.result import EmbeddingResult, EmbedInputType
+from pydantic_ai.embeddings.settings import EmbeddingSettings
+from pydantic_ai.exceptions import ModelAPIError
+from pydantic_ai.usage import RequestUsage
+
 try:
-    from voyageai.client import Client  # type: ignore
+    from voyageai.client_async import AsyncClient
+    from voyageai.error import VoyageError
+except ImportError as _import_error:
+    raise ImportError(
+        "Please install `voyageai` to use the VoyageAI embeddings model, "
+        "you can use — `pip install voyageai`"
+    ) from _import_error
 
-    from haiku.rag.config import AppConfig
+LatestVoyageAIEmbeddingModelNames = Literal[
+    "voyage-3-large",
+    "voyage-3.5",
+    "voyage-3.5-lite",
+    "voyage-code-3",
+    "voyage-finance-2",
+    "voyage-law-2",
+    "voyage-code-2",
+]
+"""Latest VoyageAI embedding models.
 
-    class Embedder:
-        """VoyageAI embedder with explicit query/document methods."""
+See [VoyageAI Embeddings](https://docs.voyageai.com/docs/embeddings)
+for available models and their capabilities.
+"""
 
-        def __init__(self, model: str, vector_dim: int, config: AppConfig):
-            self._model = model
-            self._vector_dim = vector_dim
-            self._config = config
+VoyageAIEmbeddingModelName = str | LatestVoyageAIEmbeddingModelNames
+"""Possible VoyageAI embedding model names."""
 
-        async def embed_query(self, text: str) -> list[float]:
-            """Embed a search query."""
-            client = Client()
-            res = client.embed(
-                [text], model=self._model, input_type="query", output_dtype="float"
+
+class VoyageAIEmbeddingSettings(EmbeddingSettings, total=False):
+    """Settings used for a VoyageAI embedding model request.
+
+    All fields from [`EmbeddingSettings`][pydantic_ai.embeddings.EmbeddingSettings] are supported,
+    plus VoyageAI-specific settings prefixed with `voyageai_`.
+    """
+
+    # ALL FIELDS MUST BE `voyageai_` PREFIXED SO YOU CAN MERGE THEM WITH OTHER MODELS.
+
+    voyageai_truncation: bool
+    """Whether to truncate inputs that exceed the model's context length.
+
+    Defaults to True. If False, an error is raised for inputs that are too long.
+    """
+
+    voyageai_output_dtype: Literal["float", "int8", "uint8", "binary", "ubinary"]
+    """The output data type for embeddings.
+
+    - `'float'` (default): 32-bit floats
+    - `'int8'`: Signed 8-bit integers (quantized)
+    - `'uint8'`: Unsigned 8-bit integers (quantized)
+    - `'binary'`: Binary embeddings
+    - `'ubinary'`: Unsigned binary embeddings
+    """
+
+
+_MAX_INPUT_TOKENS: dict[VoyageAIEmbeddingModelName, int] = {
+    "voyage-3-large": 32000,
+    "voyage-3.5": 32000,
+    "voyage-3.5-lite": 32000,
+    "voyage-code-3": 32000,
+    "voyage-finance-2": 32000,
+    "voyage-law-2": 16000,
+    "voyage-code-2": 16000,
+}
+
+
+@dataclass(init=False)
+class VoyageAIEmbeddingModel(EmbeddingModel):
+    """VoyageAI embedding model implementation.
+
+    VoyageAI provides state-of-the-art embedding models optimized for
+    retrieval, with specialized models for code, finance, and legal domains.
+
+    Example:
+    ```python
+    from pydantic_ai.embeddings.voyageai import VoyageAIEmbeddingModel
+
+    model = VoyageAIEmbeddingModel('voyage-3.5')
+    ```
+    """
+
+    _model_name: VoyageAIEmbeddingModelName = field(repr=False)
+    _client: AsyncClient = field(repr=False)
+
+    def __init__(
+        self,
+        model_name: VoyageAIEmbeddingModelName,
+        *,
+        api_key: str | None = None,
+        max_retries: int = 0,
+        timeout: int | None = None,
+        settings: EmbeddingSettings | None = None,
+    ):
+        """Initialize a VoyageAI embedding model.
+
+        Args:
+            model_name: The name of the VoyageAI model to use.
+                See [VoyageAI models](https://docs.voyageai.com/docs/embeddings)
+                for available options.
+            api_key: The VoyageAI API key. If not provided, uses the
+                `VOYAGE_API_KEY` environment variable.
+            max_retries: Maximum number of retries for failed requests.
+            timeout: Request timeout in seconds.
+            settings: Model-specific [`EmbeddingSettings`][pydantic_ai.embeddings.EmbeddingSettings]
+                to use as defaults for this model.
+        """
+        self._model_name = model_name
+        self._client = AsyncClient(
+            api_key=api_key,
+            max_retries=max_retries,
+            timeout=timeout,
+        )
+
+        super().__init__(settings=settings)
+
+    @property
+    def model_name(self) -> VoyageAIEmbeddingModelName:
+        """The embedding model name."""
+        return self._model_name
+
+    @property
+    def system(self) -> str:
+        """The embedding model provider."""
+        return "voyageai"
+
+    async def embed(
+        self,
+        inputs: str | Sequence[str],
+        *,
+        input_type: EmbedInputType,
+        settings: EmbeddingSettings | None = None,
+    ) -> EmbeddingResult:
+        inputs, settings = self.prepare_embed(inputs, settings)
+        settings = cast(VoyageAIEmbeddingSettings, settings)
+
+        voyageai_input_type = "document" if input_type == "document" else "query"
+
+        try:
+            response = await self._client.embed(
+                texts=list(inputs),
+                model=self.model_name,
+                input_type=voyageai_input_type,
+                truncation=settings.get("voyageai_truncation", True),
+                output_dtype=settings.get("voyageai_output_dtype", "float"),
+                output_dimension=settings.get("dimensions"),
             )
-            return res.embeddings[0]  # type: ignore[return-value]
+        except VoyageError as e:
+            raise ModelAPIError(model_name=self.model_name, message=str(e)) from e
 
-        async def embed_documents(self, texts: list[str]) -> list[list[float]]:
-            """Embed documents/chunks for indexing."""
-            if not texts:
-                return []
-            client = Client()
-            res = client.embed(
-                texts, model=self._model, input_type="document", output_dtype="float"
-            )
-            return res.embeddings  # type: ignore[return-value]
+        return EmbeddingResult(
+            embeddings=response.embeddings,
+            inputs=inputs,
+            input_type=input_type,
+            usage=_map_usage(response.total_tokens, self.model_name),
+            model_name=self.model_name,
+            provider_name=self.system,
+        )
 
-except ImportError:
-    pass
+    async def max_input_tokens(self) -> int | None:
+        return _MAX_INPUT_TOKENS.get(self.model_name)
+
+
+def _map_usage(total_tokens: int, model: str) -> RequestUsage:
+    usage_data = {"total_tokens": total_tokens}
+    response_data = {"model": model, "usage": usage_data}
+
+    return RequestUsage.extract(
+        response_data,
+        provider="voyageai",
+        provider_url="https://api.voyageai.com",
+        provider_fallback="voyageai",
+        api_flavor="embeddings",
+    )