ImportError: cannot import name 'BaseCache' from 'langchain'

Tylersuard commented 6 months ago

System Info

Every time I use Langchain, something is wrong with it. This is just the latest iteration. If you guys want people to use your library you seriously need to clean things up.

Who can help?

No response

Information

[ ] The official example notebooks/scripts
[X] My own modified scripts

Related Components

[X] LLMs/Chat Models
[ ] Embedding Models
[ ] Prompts / Prompt Templates / Prompt Selectors
[ ] Output Parsers
[ ] Document Loaders
[ ] Vector Stores / Retrievers
[ ] Memory
[ ] Agents / Agent Executors
[ ] Tools / Toolkits
[ ] Chains
[ ] Callbacks/Tracing
[ ] Async

Reproduction

To reproduce:

from llama_index import SimpleDirectoryReader, LLMPredictor, ServiceContext, GPTVectorStoreIndex

Expected behavior

Run without error

dosubot[bot] commented 6 months ago

🤖

Hello @Tylersuard,

I'm Dosu, a bot here to help with your issues and questions about LangChain. I can provide some initial guidance while we wait for a human maintainer. I'm here to make your experience better. Let's work together to fix this bug you've encountered.

I understand your frustration and I'm here to help. The error you're encountering, ImportError: cannot import name 'BaseCache' from 'langchain', is likely due to the 'BaseCache' not being defined or imported in the 'langchain' module.

From the provided context, it seems 'BaseCache' is not included in the imports or the 'all' list in the 'init.py' file of the 'langchain_core.language_models' module. To resolve this issue, you need to ensure that 'BaseCache' is properly defined and imported. If 'BaseCache' is a class or function that you've defined in another file within the 'langchain_core.language_models' module, you need to import it in the 'init.py' file.

For example, if 'BaseCache' is defined in a file named 'cache.py' in the 'langchain_core.language_models' module, you would add the following import statement to the 'init.py' file:

from langchain_core.language_models.cache import BaseCache

And then add 'BaseCache' to the 'all' list:

__all__ = [
    "BaseLanguageModel",
    "BaseChatModel",
    "SimpleChatModel",
    "BaseLLM",
    "LLM",
    "LanguageModelInput",
    "get_tokenizer",
    "LanguageModelOutput",
    "BaseCache",
]

If 'BaseCache' is not defined in your project, you need to check your scripts for any incorrect import statements and correct them. If 'BaseCache' is part of a third-party library, make sure the library is installed and correctly imported in your scripts. You can refer to the LangChain core language models for more details.

Additionally, there have been similar issues reported in the past where the solution was to uninstall the current versions of llama-index and langchain, then install specific versions of these packages. The versions that have been reported to work are llama-index==0.5.6 and langchain==0.0.148. You can do this using pip with the following commands:

pip install llama-index==0.5.6
pip install langchain==0.0.148

Please note that some features may not be available in these older versions. If you need to use features introduced in later versions, you may need to upgrade these packages to a more recent version. You can refer to the Was Running Fine and now getting errors issue for more details.

I hope this helps! If you have any other issues or questions, feel free to ask.

Sources

This response is meant to be useful and save you time. It is not meant to be a precise solution, but rather a starting point for your own research.

Help me be more useful! Please leave a 👍 if this is helpful and 👎 if it is irrelevant.

If you want to continue the conversation, start your reply with @dosu-bot.

vivienneprince commented 6 months ago

I had a similar issue (ImportError: cannot import name 'Document' from 'langchain.schema.retriever') with langchain-0.0.345, it worked after I downgraded to 0.0.340 🤷

pip uninstall -y langchain
pip install langchain==0.0.340

169 commented 6 months ago

@vivienneprince You should use from langchain_core.documents import Document or from langchain.schema.document import Document

169 commented 6 months ago

@Tylersuard This problem can be solved if you update llama-index to the latest version, or lower the langchain version to 0.0.148

Sacharith commented 5 months ago

BaseCache is in here langchain -> scheme -> cache

Use this "from langchain.schema.cache import BaseCache"

instead of "from langchain_core.language_models.cache import BaseCache"

langchain-core version(0.1.5) langchain version(0.0.340)

urs-karna commented 3 months ago

i got an error that ImportError: cannot import name 'BaseCach' from 'langchain' but it is not resolved
what i have do for debugging the error sir

langchain-ai / langchain