refactor: remove LangChain wrappers for Ollama

Author: f-aguzzi

scrapegraphai/nodes/generate_answer_omni_node.py

@@ -10,7 +10,7 @@
 from langchain_core.output_parsers import JsonOutputParser
 from langchain_core.runnables import RunnableParallel
 from tqdm import tqdm
-from ..models import Ollama
+from langchain_community.chat_models import ChatOllama
 # Imports from the library
 from .base_node import BaseNode
 from ..helpers.generate_answer_node_omni_prompts import template_no_chunk_omni, template_chunks_omni, template_merge_omni
@@ -44,7 +44,7 @@ def __init__(
         super().__init__(node_name, "node", input, output, 3, node_config)
 
         self.llm_model = node_config["llm_model"]
-        if isinstance(node_config["llm_model"], Ollama):
+        if isinstance(node_config["llm_model"], ChatOllama):
             self.llm_model.format="json"
 
         self.verbose = (

scrapegraphai/nodes/generate_answer_pdf_node.py

@@ -10,7 +10,7 @@
 from langchain_core.output_parsers import JsonOutputParser
 from langchain_core.runnables import RunnableParallel
 from tqdm import tqdm
-from ..models import Ollama
+from langchain_community.chat_models import ChatOllama
 from ..utils.logging import get_logger
 
 # Imports from the library
@@ -59,7 +59,7 @@ def __init__(
         super().__init__(node_name, "node", input, output, 2, node_config)
 
         self.llm_model = node_config["llm_model"]
-        if isinstance(node_config["llm_model"], Ollama):
+        if isinstance(node_config["llm_model"], ChatOllama):
             self.llm_model.format="json"
 
         self.verbose = (