No module named 'langchain.callbacks.tracers.log_stream'

[kientv]

System Info

I already create venv and re-install langchain: pip install langchain but error:

from langserve import add_routes

File "/usr/local/lib/python3.10/dist-packages/langserve/init.py", line 7, in from langserve.client import RemoteRunnable File "/usr/local/lib/python3.10/dist-packages/langserve/client.py", line 29, in from langchain.callbacks.tracers.log_stream import RunLogPatch ModuleNotFoundError: No module named 'langchain.callbacks.tracers.log_stream'

Who can help?

@agola11

Information

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

Related Components

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

Reproduction

$ python3 -m venv venv $ source venv/bin/activate $ pip install langchain $ pip install google-generativeai $ pip install fastapi $ pip install uvicorn $ pip install langserve $ uvicorn main:app --host 0.0.0.0 --port 8000

Expected behavior

App run with langserve without error

[dosubot[bot]]

🤖

Hello again @kientv! It's great to see you back in our repository. I hope you're doing well. Let's dive into the issue you're facing.

Based on the information provided, it seems like you're encountering a ModuleNotFoundError for the langchain.callbacks.tracers.log_stream module. This error typically occurs when Python cannot find the specified module in the directories where it normally looks for modules.

Here are a few things you can try:

1. Check if the module is correctly installed: You can do this by trying to import the module in a Python shell.

import langchain.callbacks.tracers.log_stream

If this import statement runs without any errors, then the module is correctly installed.

2. Check if the module is in the Python path: You can print the Python path in a Python shell with the following commands:

import sys
print(sys.path)

This will print a list of directories. Make sure the directory containing the 'langchain' package is in this list.

3. Check if the module is in the correct directory: The 'langchain.callbacks.tracers.log_stream' module should be located in a directory structure that matches the import statement. In this case, the directory structure should be 'langchain/callbacks/tracers/' and the module file should be 'log_stream.py'.

4. Check the spelling of the module name: Make sure the module name in the import statement matches exactly with the actual module name. Python module names are case-sensitive.

If none of these solutions work, there might be an issue with the langchain package itself.

Also, I found a similar solved issue in the LangChain repository: can't import callback manager. The suggested solution there was to upgrade your Python version to above 3.9.

Lastly, I can confirm that the 'langchain.callbacks.tracers.log_stream' module is present in the latest version of LangChain (v0.0.346). You can find the code for the 'log_stream.py' file here.

I hope this helps! If you have any other questions or if the issue persists, please provide more details so I can assist you better.

Sources

• can't import callback manager
• libs/langchain/langchain/schema/callbacks/tracers/log_stream.py

---

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

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[umair313]

@kientv can you please specify langchain, langserve, and python versions.

[kientv]

@kientv can you please specify langchain, langserve, and python versions.

python: 3.10 langchain: 0.0.247 langserve: 0.0.33

I have just upgrade to 0.0.347 by python -m pip install --upgrade langchain[llm]: python: 3.10 langchain: 0.0.347 langserve: 0.0.34

But it still error: uvicorn main:app --host 0.0.0.0 --port 8000

File "/home/kientv/.local/lib/python3.10/site-packages/uvicorn/importer.py", line 21, in import_from_string module = importlib.import_module(module_str) File "/usr/lib/python3.10/importlib/init.py", line 126, in import_module return _bootstrap._gcd_import(name[level:], package, level) File "", line 1050, in _gcd_import File "", line 1027, in _find_and_load File "", line 1006, in _find_and_load_unlocked File "", line 688, in _load_unlocked File "", line 883, in exec_module File "", line 241, in _call_with_frames_removed File "/home/palm2/./main.py", line 20, in from langserve import add_routes File "/usr/local/lib/python3.10/dist-packages/langserve/init.py", line 7, in from langserve.client import RemoteRunnable File "/usr/local/lib/python3.10/dist-packages/langserve/client.py", line 29, in from langchain.callbacks.tracers.log_stream import RunLogPatch ModuleNotFoundError: No module named 'langchain.callbacks.tracers.log_stream'

Thank for your support

[kientv]

Now it work fine with python3.11:
python3 -m uvicorn main:app --host 0.0.0.0 --port 8000