Add base64 encoded embedding support

src/api/models/bedrock.py

@@ -3,9 +3,10 @@ import json
 import logging
 import re
 from abc import ABC
-from typing import AsyncIterable, Iterable
+from typing import AsyncIterable, Iterable, Literal
 
 import boto3
+import numpy as np
 import requests
 import tiktoken
 from fastapi import HTTPException
@@ -685,11 +686,17 @@ class BedrockEmbeddingsModel(BaseEmbeddingsModel, ABC):
             model: str,
             input_tokens: int = 0,
             output_tokens: int = 0,
+            encoding_format: Literal["float", "base64"] = "float",
     ) -> EmbeddingsResponse:
-        data = [
-            Embedding(index=i, embedding=embedding)
-            for i, embedding in enumerate(embeddings)
-        ]
+        data = []
+        for i, embedding in enumerate(embeddings):
+            if encoding_format == "base64":
+                arr = np.array(embedding, dtype=np.float32)
+                arr_bytes = arr.tobytes()
+                encoded_embedding = base64.b64encode(arr_bytes)
+                data.append(Embedding(index=i, embedding=encoded_embedding))
+            else:
+                data.append(Embedding(index=i, embedding=embedding))
         response = EmbeddingsResponse(
             data=data,
             model=model,
@@ -746,6 +753,7 @@ class CohereEmbeddingsModel(BedrockEmbeddingsModel):
         return self._create_response(
             embeddings=response_body["embeddings"],
             model=embeddings_request.model,
+            encoding_format=embeddings_request.encoding_format,
         )
 
 

src/api/schema.py

@@ -143,14 +143,14 @@ class ChatStreamResponse(BaseChatResponse):
 class EmbeddingsRequest(BaseModel):
     input: str | list[str] | Iterable[int | Iterable[int]]
     model: str
-    encoding_format: Literal["float", "base64"] = "float"  # not used.
+    encoding_format: Literal["float", "base64"] = "float"
     dimensions: int | None = None  # not used.
     user: str | None = None  # not used.
 
 
 class Embedding(BaseModel):
     object: Literal["embedding"] = "embedding"
-    embedding: list[float]
+    embedding: list[float] | bytes
     index: int
 
 

src/requirements.txt

@@ -1,6 +1,7 @@
-fastapi==0.110.0
-pydantic==2.6.3
-uvicorn==0.27.0.post1
+fastapi==0.110.2
+pydantic==2.7.1
+uvicorn==0.29.0
 mangum==0.17.0
 tiktoken==0.6.0
-requests==2.31.0
+requests==2.31.0
+numpy==1.26.4