IMPROVEMENT: VoyageEmbeddings embed_general_texts (#13620)

- **Description:** add method embed_general_texts in VoyageEmebddings to
support input_type
  - **Issue:** 
  - **Dependencies:** 
  - **Tag maintainer:** 
  - **Twitter handle:** @Voyage_AI_

libs/langchain/langchain/embeddings/voyageai.py

@@ -115,10 +115,16 @@ class VoyageEmbeddings(BaseModel, Embeddings):
         return params
 
     def _get_embeddings(
-        self, texts: List[str], batch_size: int, input_type: Optional[str] = None
+        self,
+        texts: List[str],
+        batch_size: Optional[int] = None,
+        input_type: Optional[str] = None,
     ) -> List[List[float]]:
         embeddings: List[List[float]] = []
 
+        if batch_size is None:
+            batch_size = self.batch_size
+
         if self.show_progress_bar:
             try:
                 from tqdm.auto import tqdm
@@ -168,9 +174,24 @@ class VoyageEmbeddings(BaseModel, Embeddings):
         Args:
             text: The text to embed.
 
+        Returns:
+            Embedding for the text.
+        """
+        return self._get_embeddings([text], input_type="query")[0]
+
+    def embed_general_texts(
+        self, texts: List[str], *, input_type: Optional[str] = None
+    ) -> List[List[float]]:
+        """Call out to Voyage Embedding endpoint for embedding general text.
+
+        Args:
+            texts: The list of texts to embed.
+            input_type: Type of the input text. Default to None, meaning the type is
+                unspecified. Other options: query, document.
+
         Returns:
             Embedding for the text.
         """
         return self._get_embeddings(
-            [text], batch_size=self.batch_size, input_type="query"
+            texts, batch_size=self.batch_size, input_type=input_type
-        )[0]
+        )