refactor: Changed the way embedding model is created in AbstractGraph class and removed handling of embedding model creation from RAGNode. Now AbstractGraph will call a dedicated method for embedding models instead of _create_llm. This makes it easy to use any LLM with any supported embedding model.

examples/groq/smart_scraper_groq_openai.py

@@ -25,7 +25,7 @@ graph_config = {
     },
     "embeddings": {
         "api_key": openai_key,
-        "model": "gpt-3.5-turbo",
+        "model": "openai",
     },
     "headless": False
 }

scrapegraphai/graphs/abstract_graph.py

@@ -5,8 +5,12 @@ AbstractGraph Module
 from abc import ABC, abstractmethod
 from typing import Optional
 
-from ..models import OpenAI, Gemini, Ollama, AzureOpenAI, HuggingFace, Groq, Bedrock
+from langchain_aws.embeddings.bedrock import BedrockEmbeddings
+from langchain_community.embeddings import HuggingFaceHubEmbeddings, OllamaEmbeddings
+from langchain_openai import AzureOpenAIEmbeddings, OpenAIEmbeddings
+
 from ..helpers import models_tokens
+from ..models import AzureOpenAI, Bedrock, Gemini, Groq, HuggingFace, Ollama, OpenAI
 
 
 class AbstractGraph(ABC):
@@ -43,7 +47,8 @@ class AbstractGraph(ABC):
         self.source = source
         self.config = config
         self.llm_model = self._create_llm(config["llm"], chat=True)
-        self.embedder_model = self.llm_model if "embeddings" not in config else self._create_llm(
+        self.embedder_model = self._create_default_embedder(    
+            ) if "embeddings" not in config else self._create_embedder(
             config["embeddings"])
 
         # Set common configuration parameters
@@ -166,6 +171,85 @@ class AbstractGraph(ABC):
             raise ValueError(
                 "Model provided by the configuration not supported")
     
+    def _create_default_embedder(self) -> object:
+        """
+        Create an embedding model instance based on the chosen llm model.
+
+        Returns:
+            object: An instance of the embedding model client.
+
+        Raises:
+            ValueError: If the model is not supported.
+        """
+
+        if isinstance(self.llm_model, OpenAI):
+            return OpenAIEmbeddings(api_key=self.llm_model.openai_api_key)
+        elif isinstance(self.llm_model, AzureOpenAIEmbeddings):
+            return self.llm_model
+        elif isinstance(self.llm_model, AzureOpenAI):
+            return AzureOpenAIEmbeddings()
+        elif isinstance(self.llm_model, Ollama):
+            # unwrap the kwargs from the model whihc is a dict
+            params = self.llm_model._lc_kwargs
+            # remove streaming and temperature
+            params.pop("streaming", None)
+            params.pop("temperature", None)
+
+            return OllamaEmbeddings(**params)
+        elif isinstance(self.llm_model, HuggingFace):
+            return HuggingFaceHubEmbeddings(model=self.llm_model.model)
+        elif isinstance(self.llm_model, Bedrock):
+            return BedrockEmbeddings(client=None, model_id=self.llm_model.model_id)
+        else:
+            raise ValueError("Embedding Model missing or not supported")
+        
+    def _create_embedder(self, embedder_config: dict) -> object:
+        """
+        Create an embedding model instance based on the configuration provided.
+
+        Args:
+            embedder_config (dict): Configuration parameters for the embedding model.
+
+        Returns:
+            object: An instance of the embedding model client.
+
+        Raises:
+            KeyError: If the model is not supported.
+        """
+        
+        # Instantiate the embedding model based on the model name
+        if "openai" in embedder_config["model"]:
+            return OpenAIEmbeddings(api_key=embedder_config["api_key"])
+
+        elif "azure" in embedder_config["model"]:
+            return AzureOpenAIEmbeddings()
+
+        elif "ollama" in embedder_config["model"]:
+            embedder_config["model"] = embedder_config["model"].split("/")[-1]
+            try:
+                models_tokens["ollama"][embedder_config["model"]]
+            except KeyError:
+                raise KeyError("Model not supported")
+            return OllamaEmbeddings(**embedder_config)
+        
+        elif "hugging_face" in embedder_config["model"]:
+            try:
+                models_tokens["hugging_face"][embedder_config["model"]]
+            except KeyError:
+                raise KeyError("Model not supported")
+            return HuggingFaceHubEmbeddings(model=embedder_config["model"])
+        
+        elif "bedrock" in embedder_config["model"]:
+            embedder_config["model"] = embedder_config["model"].split("/")[-1]
+            try:
+                models_tokens["bedrock"][embedder_config["model"]]
+            except KeyError:
+                raise KeyError("Model not supported")
+            return BedrockEmbeddings(client=None, model_id=embedder_config["model"])
+        else:
+            raise ValueError(
+                "Model provided by the configuration not supported") 
+
     def get_state(self, key=None) -> dict:
         """""
         Get the final state of the graph.

scrapegraphai/nodes/rag_node.py

@@ -87,31 +87,7 @@ class RAGNode(BaseNode):
         if self.verbose:
             print("--- (updated chunks metadata) ---")
 
-        # check if embedder_model is provided, if not use llm_model
+        embeddings = self.embedder_model
-        embedding_model = self.embedder_model if self.embedder_model else self.llm_model
-
-        if isinstance(embedding_model, OpenAI):
-            embeddings = OpenAIEmbeddings(
-                api_key=embedding_model.openai_api_key)
-        elif isinstance(embedding_model, AzureOpenAIEmbeddings):
-            embeddings = embedding_model
-        elif isinstance(embedding_model, AzureOpenAI):
-            embeddings = AzureOpenAIEmbeddings()
-        elif isinstance(embedding_model, Ollama):
-            # unwrap the kwargs from the model whihc is a dict
-            params = embedding_model._lc_kwargs
-            # remove streaming and temperature
-            params.pop("streaming", None)
-            params.pop("temperature", None)
-
-            embeddings = OllamaEmbeddings(**params)
-        elif isinstance(embedding_model, HuggingFace):
-            embeddings = HuggingFaceHubEmbeddings(model=embedding_model.model)
-        elif isinstance(embedding_model, Bedrock):
-            embeddings = BedrockEmbeddings(
-                client=None, model_id=embedding_model.model_id)
-        else:
-            raise ValueError("Embedding Model missing or not supported")
 
         retriever = FAISS.from_documents(
             chunked_docs, embeddings).as_retriever()