apply review suggestions

Author: Pouyanpi

docs/user-guides/python-api.md

@@ -132,7 +132,7 @@ For convenience, this toolkit also includes a selection of LangChain tools, wrap
 
 ### Chains as Actions
 
-> **⚠️ DEPRECATED**: Chain support is deprecated and will be removed in a future release. Please use [Runnable](https://python.langchain.com/docs/expression_language/) instead. See the [Runnable as Action Guide](langchain/runnable-as-action/README.md) for examples.
+> **⚠️ DEPRECATED**: Chain support is deprecated and will be removed in a future release. Please use [Runnable](https://python.langchain.com/docs/expression_language/) instead. See the [Runnable as Action Guide](../langchain/runnable-as-action/README.md) for examples.
 
 You can register a Langchain chain as an action using the [LLMRails.register_action](../api/nemoguardrails.rails.llm.llmrails.md#method-llmrailsregister_action) method:
 

examples/configs/rag/multi_kb/config.py

@@ -33,11 +33,12 @@
         from langchain_classic.embeddings import HuggingFaceEmbeddings
         from langchain_classic.text_splitter import CharacterTextSplitter
         from langchain_classic.vectorstores import FAISS
-    except ImportError as e:
+    except ImportError as second_error:
         raise ImportError(
-            "Failed to import from langchain. If you're using LangChain >= 1.0.0, "
-            "please install langchain-classic: pip install langchain-classic"
-        ) from e
+            f"Failed to import required LangChain modules. "
+            f"If you're using LangChain >= 1.0.0, ensure langchain-classic and langchain-text-splitters is installed. "
+            f"Original error: {second_error}"
+        ) from second_error
 
 from langchain_core.language_models.llms import BaseLLM
 from transformers import AutoModelForCausalLM, AutoTokenizer, pipeline

examples/configs/rag/pinecone/config.py

@@ -21,22 +21,21 @@
 
 try:
     from langchain.chains import RetrievalQA
-    from langchain.docstore.document import Document
     from langchain.embeddings.openai import OpenAIEmbeddings
     from langchain.vectorstores import Pinecone
 except ImportError:
     try:
         from langchain_classic.chains import RetrievalQA
-        from langchain_classic.docstore.document import Document
         from langchain_classic.embeddings.openai import OpenAIEmbeddings
         from langchain_classic.vectorstores import Pinecone
-    except ImportError as e:
+    except ImportError as second_error:
         raise ImportError(
-            "Failed to import from langchain. If you're using LangChain >= 1.0.0, "
-            "please install langchain-classic: pip install langchain-classic"
-        ) from e
+            f"Failed to import required LangChain modules. "
+            f"If you're using LangChain >= 1.0.0, ensure langchain-classic is installed. "
+            f"Original error: {second_error}"
+        ) from second_error
 
-from langchain_core.language_models.llms import BaseLLM
+from langchain_core.language_models import BaseLLM
 
 from nemoguardrails import LLMRails
 from nemoguardrails.actions import action

examples/scripts/langchain/experiments.py

@@ -20,11 +20,12 @@
 except ImportError:
     try:
         from langchain_classic.chains import LLMMathChain
-    except ImportError as e:
+    except ImportError as second_error:
         raise ImportError(
-            "Failed to import LLMMathChain. If you're using LangChain >= 1.0.0, "
-            "please install langchain-classic: pip install langchain-classic"
-        ) from e
+            f"Failed to import required LangChain modules. "
+            f"If you're using LangChain >= 1.0.0, ensure langchain-classic is installed. "
+            f"Original error: {second_error}"
+        ) from second_error
 
 from langchain_core.prompts import ChatPromptTemplate
 from langchain_core.tools import Tool