Update embedding API

src/api/models/base.py

@@ -0,0 +1,51 @@
+import uuid
+from abc import ABC, abstractmethod
+from typing import AsyncIterable
+
+from api.schema import (
+    # Chat
+    ChatResponse,
+    ChatRequest,
+    ChatStreamResponse,
+    # Embeddings
+    EmbeddingsRequest,
+    EmbeddingsResponse,
+)
+
+
+class BaseChatModel(ABC):
+    """Represent a basic chat model
+
+    Currently, only Bedrock model is supported, but may be used for SageMaker models if needed.
+    """
+
+    @abstractmethod
+    def chat(self, chat_request: ChatRequest) -> ChatResponse:
+        """Handle a basic chat completion requests."""
+        pass
+
+    @abstractmethod
+    def chat_stream(self, chat_request: ChatRequest) -> AsyncIterable[bytes]:
+        """Handle a basic chat completion requests with stream response."""
+        pass
+
+    def _generate_message_id(self) -> str:
+        return "chatcmpl-" + str(uuid.uuid4())[:8]
+
+    def _stream_response_to_bytes(self, response: ChatStreamResponse) -> bytes:
+        return "data: {}\n\n".format(response.model_dump_json()).encode("utf-8")
+
+
+class BaseEmbeddingsModel(ABC):
+    """Represents a basic embeddings model.
+
+    Currently, only Bedrock-provided models are supported, but it may be used for SageMaker models if needed.
+    """
+
+    @abstractmethod
+    def embed(self, embeddings_request: EmbeddingsRequest) -> EmbeddingsResponse:
+        """Handle a basic embeddings request."""
+        pass
+
+    def _generate_message_id(self) -> str:
+        return "embeddings-" + str(uuid.uuid4())[:8]

src/api/models/bedrock.py

@@ -1,11 +1,10 @@
 import json
 import logging
-import uuid
-from abc import ABC, abstractmethod
 from typing import AsyncIterable
 
 import boto3
 
+from api.models.base import BaseChatModel, BaseEmbeddingsModel
 from api.schema import (
     # Chat
     ChatResponse,
@@ -50,28 +49,6 @@ SUPPORTED_BEDROCK_EMBEDDING_MODELS = {
     "amazon.titan-embed-image-v1": "Titan Multimodal Embeddings G1"
 }
 
-class BaseChatModel(ABC):
-    """Represent a basic chat model
-
-    Currently, only Bedrock model is supported, but may be used for SageMaker models if needed.
-    """
-
-    @abstractmethod
-    def chat(self, chat_request: ChatRequest) -> ChatResponse:
-        """Handle a basic chat completion requests."""
-        pass
-
-    @abstractmethod
-    def chat_stream(self, chat_request: ChatRequest) -> AsyncIterable[bytes]:
-        """Handle a basic chat completion requests with stream response."""
-        pass
-
-    def _generate_message_id(self) -> str:
-        return "chatcmpl-" + str(uuid.uuid4())[:8]
-
-    def _stream_response_to_bytes(self, response: ChatStreamResponse) -> bytes:
-        return "data: {}\n\n".format(response.model_dump_json()).encode("utf-8")
-
 
 # https://docs.aws.amazon.com/bedrock/latest/userguide/model-parameters.html
 class BedrockModel(BaseChatModel):
@@ -403,37 +380,15 @@ class MistralModel(BedrockModel):
             yield self._stream_response_to_bytes(response)
 
 
-class BaseEmbeddingsModel(ABC):
-    """Represents a basic embeddings model.
-
-    Currently, only Bedrock-provided models are supported, but it may be used for SageMaker models if needed.
-    """
-
-    @abstractmethod
-    def embed(self, embeddings_request: EmbeddingsRequest) -> EmbeddingsResponse:
-        """Handle a basic embeddings request."""
-        pass
-
-    def _generate_message_id(self) -> str:
-        return "embeddings-" + str(uuid.uuid4())[:8]
-
-
 class BedrockEmbeddingsModel(BaseEmbeddingsModel):
     accept = "application/json"
     content_type = "application/json"
 
-    def _invoke_model(self, args: dict, model_id: str, with_stream: bool = False):
+    def _invoke_model(self, args: dict, model_id: str):
         body = json.dumps(args)
         if DEBUG:
             logger.info("Invoke Bedrock Model: " + model_id)
             logger.info("Bedrock request body: " + body)
-        if with_stream:
-            return bedrock_runtime.invoke_model_with_response_stream(
-                body=body,
-                modelId=model_id,
-                accept=self.accept,
-                contentType=self.content_type,
-            )
         return bedrock_runtime.invoke_model(
             body=body,
             modelId=model_id,
@@ -462,6 +417,7 @@ class BedrockEmbeddingsModel(BaseEmbeddingsModel):
                 total_tokens=input_tokens + output_tokens,
             ),
         )
+
         if DEBUG:
             logger.info("Proxy response :" + response.model_dump_json())
         return response
@@ -487,10 +443,12 @@ class CohereEmbeddingsModel(BedrockEmbeddingsModel):
             texts = [embeddings_request.input]
         elif isinstance(embeddings_request.input, list):
             texts = embeddings_request.input
+
+        # Maximum of 2048 characters
         args = {
             "texts": texts,
-            "input_type": embeddings_request.input_type if embeddings_request.input_type else "search_document",
+            "input_type": "search_document",
-            "truncate": embeddings_request.truncate if embeddings_request.truncate else "NONE",
+            "truncate": "END",  # "NONE|START|END"
         }
         return args
 
@@ -522,7 +480,8 @@ class TitanEmbeddingsModel(BedrockEmbeddingsModel):
             # Note: inputImage is not supported!
         }
         if embeddings_request.model == "amazon.titan-embed-image-v1":
-            args["embeddingConfig"] = embeddings_request.embedding_config if embeddings_request.embedding_config else {"outputEmbeddingLength": 1024}
+            args["embeddingConfig"] = embeddings_request.embedding_config if embeddings_request.embedding_config else {
+                "outputEmbeddingLength": 1024}
         return args
 
     def embed(self, embeddings_request: EmbeddingsRequest) -> EmbeddingsResponse:

src/api/routers/chat.py

@@ -12,7 +12,6 @@ router = APIRouter()
 
 router = APIRouter(
     prefix="/chat",
-    tags=["items"],
     dependencies=[Depends(api_key_auth)],
     # responses={404: {"description": "Not found"}},
 )

src/api/routers/embeddings.py

@@ -11,7 +11,6 @@ router = APIRouter()
 
 router = APIRouter(
     prefix="/embeddings",
-    tags=["items"],
     dependencies=[Depends(api_key_auth)],
 )
 
@@ -38,6 +37,7 @@ async def embeddings(
         raise HTTPException(status_code=400, detail="Unsupported Model Id " + embeddings_request.model)
     try:
         model = get_embeddings_model(embeddings_request.model)
+        # TODO: Check type of input
         return model.embed(embeddings_request)
     except ValueError as e:
         raise HTTPException(status_code=400, detail=str(e))

src/api/schema.py

@@ -1,5 +1,5 @@
 import time
-from typing import Literal
+from typing import Literal, Iterable
 
 from pydantic import BaseModel, Field
 
@@ -81,18 +81,11 @@ class ChatStreamResponse(BaseChatResponse):
 
 
 class EmbeddingsRequest(BaseModel):
-    input: str | list[str]
+    input: str | list[str] | Iterable[int] | Iterable[Iterable[int]]
-    model: str
-    # Cohere Embed
-    input_type: Literal["search_document", "search_query", "classification", "clustering"] | None = None
-    truncate: Literal["NONE", "LEFT", "RIGHT"] | None = None
-    # Titan Embeddings
-    embedding_config: dict | None = None
-
-
-class BaseEmbeddingsResponse(BaseModel):
-    created: int = Field(default_factory=lambda: int(time.time()))
     model: str
+    encoding_format: Literal["float", "base64"] = "float"  # not used.
+    dimensions: int | None = None  # not used.
+    user: str | None = None  # not used.
 
 
 class Embedding(BaseModel):
@@ -106,7 +99,8 @@ class EmbeddingsUsage(BaseModel):
     total_tokens: int
 
 
-class EmbeddingsResponse(BaseEmbeddingsResponse):
+class EmbeddingsResponse(BaseModel):
-    data: list[Embedding]
     object: Literal["list"] = "list"
+    data: list[Embedding]
+    model: str
     usage: EmbeddingsUsage