Fixed Import Error type (#10168)

I have restructured the code to ensure uniform handling of ImportError.
In place of previously used ValueError, I've adopted the standard
practice of raising ImportError with explanatory messages. This
modification enhances code readability and clarifies that any problems
stem from module importation.

---------

Co-authored-by: Aashish Saini <141953346+AashishSainiShorthillsAI@users.noreply.github.com>
Co-authored-by: AryamanJaiswalShorthillsAI <142397527+AryamanJaiswalShorthillsAI@users.noreply.github.com>
Co-authored-by: Adarsh Shrivastav <142413097+AdarshKumarShorthillsAI@users.noreply.github.com>
Co-authored-by: Vishal <141389263+VishalYadavShorthillsAI@users.noreply.github.com>
Co-authored-by: ChetnaGuptaShorthillsAI <142381084+ChetnaGuptaShorthillsAI@users.noreply.github.com>
Co-authored-by: PankajKumarShorthillsAI <142473460+PankajKumarShorthillsAI@users.noreply.github.com>
Co-authored-by: AbhishekYadavShorthillsAI <142393903+AbhishekYadavShorthillsAI@users.noreply.github.com>
Co-authored-by: AmitSinghShorthillsAI <142410046+AmitSinghShorthillsAI@users.noreply.github.com>
Co-authored-by: Aayush <142384656+AayushShorthillsAI@users.noreply.github.com>
Co-authored-by: AnujMauryaShorthillsAI <142393269+AnujMauryaShorthillsAI@users.noreply.github.com>

libs/langchain/langchain/llms/pipelineai.py

@@ -91,7 +91,7 @@ class PipelineAI(LLM, BaseModel):
         try:
             from pipeline import PipelineCloud
         except ImportError:
-            raise ValueError(
+            raise ImportError(
                 "Could not import pipeline-ai python package. "
                 "Please install it with `pip install pipeline-ai`."
             )

libs/langchain/langchain/utilities/redis.py

@@ -108,7 +108,7 @@ def get_client(redis_url: str, **kwargs: Any) -> RedisType:
     try:
         import redis
     except ImportError:
-        raise ValueError(
+        raise ImportError(
             "Could not import redis python package. "
             "Please install it with `pip install redis>=4.1.0`."
         )