feat: add Jina Embeddings (#1105)

Co-authored-by: Fangyin Cheng <staneyffer@gmail.com>

dbgpt/rag/embedding/embeddings.py

@@ -361,3 +361,70 @@ class HuggingFaceInferenceAPIEmbeddings(BaseModel, Embeddings):
             Embeddings for the text.
         """
         return self.embed_documents([text])[0]
+
+
+class JinaEmbeddings(BaseModel, Embeddings):
+    """
+    This class is used to get embeddings for a list of texts using the Jina AI API.
+    It requires an API key and a model name. The default model name is "jina-embeddings-v2-base-en".
+    """
+
+    api_url: Any  #: :meta private:
+    session: Any  #: :meta private:
+    api_key: str
+    """our API key for the Jina AI API.."""
+    model_name: str = "jina-embeddings-v2-base-en"
+    """he name of the model to use for text embeddings. Defaults to "jina-embeddings-v2-base-en"."""
+
+    def __init__(self, **kwargs):
+        """
+        Initialize the JinaEmbeddings.
+        """
+        super().__init__(**kwargs)
+        try:
+            import requests
+        except ImportError:
+            raise ValueError(
+                "The requests python package is not installed. Please install it with `pip install requests`"
+            )
+        self.api_url = "https://api.jina.ai/v1/embeddings"
+        self.session = requests.Session()
+        self.session.headers.update(
+            {"Authorization": f"Bearer {self.api_key}", "Accept-Encoding": "identity"}
+        )
+
+    def embed_documents(self, texts: List[str]) -> List[List[float]]:
+        """Get the embeddings for a list of texts.
+
+        Args:
+            texts (Documents): A list of texts to get embeddings for.
+
+        Returns:
+            Embedded texts as List[List[float]], where each inner List[float]
+                corresponds to a single input text.
+        """
+        # Call Jina AI Embedding API
+        resp = self.session.post(  # type: ignore
+            self.api_url, json={"input": texts, "model": self.model_name}
+        ).json()
+        if "data" not in resp:
+            raise RuntimeError(resp["detail"])
+
+        embeddings = resp["data"]
+
+        # Sort resulting embeddings by index
+        sorted_embeddings = sorted(embeddings, key=lambda e: e["index"])  # type: ignore
+
+        # Return just the embeddings
+        return [result["embedding"] for result in sorted_embeddings]
+
+    def embed_query(self, text: str) -> List[float]:
+        """Compute query embeddings using a HuggingFace transformer model.
+
+        Args:
+            text: The text to embed.
+
+        Returns:
+            Embeddings for the text.
+        """
+        return self.embed_documents([text])[0]