constraints.txt

[olivierdm]

I'm unable to install the environment with the current requirements.txt and constraints.txt

....
38.85 ERROR: Cannot install -r requirements.txt (line 1) because these package versions have conflicting dependencies.
38.85
38.85 The conflict is caused by:
38.85 accelerate 1.12.0 depends on torch>=2.0.0
38.85 The user requested (constraint) torch==2.3.1+cpu
38.85
38.85 Additionally, some packages in these conflicts have no matching distributions available for your environment:
38.85 torch
38.85
38.85 To fix this you could try to:
38.85 1. loosen the range of package versions you've specified
38.85 2. remove package versions to allow pip to attempt to solve the dependency conflict
38.85
38.85 ERROR: ResolutionImpossible: for help visit https://pip.pypa.io/en/latest/topics/dependency-resolution/#dealing-with-dependency-conflicts
.....

[praveshkumar1988]

Hi @olivierdm
I tried both command to create virtual environment on main and dev branch, Working fine at our end. Please try again.

[olivierdm]

I tried again following the exact instructions but I still have the error. I'm on OS X, here is the full output. I did succeed installing it in the end by making the constraints less strict (>= in stead of ==).

((venv) ) (base) olivier@Mac backend % cat constraints.txt 
-f https://download.pytorch.org/whl/torch_stable.html 
torch>=2.3.1
torchvision>=0.18.1
torchaudio>=2.3.1% 

---

OUTPUT:

((venv) ) (base) olivier@Mac backend % pip install -r requirements.txt -c constraints.txt
Looking in links: https://download.pytorch.org/whl/torch_stable.html
Collecting accelerate==1.12.0 (from -r requirements.txt (line 1))
  Using cached accelerate-1.12.0-py3-none-any.whl.metadata (19 kB)
Collecting asyncio==4.0.0 (from -r requirements.txt (line 2))
  Using cached asyncio-4.0.0-py3-none-any.whl.metadata (994 bytes)
Collecting boto3==1.40.23 (from -r requirements.txt (line 3))
  Using cached boto3-1.40.23-py3-none-any.whl.metadata (6.7 kB)
Collecting botocore==1.40.23 (from -r requirements.txt (line 4))
  Using cached botocore-1.40.23-py3-none-any.whl.metadata (5.7 kB)
Collecting certifi==2025.8.3 (from -r requirements.txt (line 5))
  Using cached certifi-2025.8.3-py3-none-any.whl.metadata (2.4 kB)
Collecting fastapi==0.116.1 (from -r requirements.txt (line 6))
  Using cached fastapi-0.116.1-py3-none-any.whl.metadata (28 kB)
Collecting fastapi-health==0.4.0 (from -r requirements.txt (line 7))
  Using cached fastapi_health-0.4.0-py3-none-any.whl.metadata (3.8 kB)
Collecting fireworks-ai==0.15.12 (from -r requirements.txt (line 8))
  Using cached fireworks_ai-0.15.12-py3-none-any.whl.metadata (5.7 kB)
Collecting google-api-core==2.25.1 (from -r requirements.txt (line 9))
  Using cached google_api_core-2.25.1-py3-none-any.whl.metadata (3.0 kB)
Collecting google-auth==2.40.3 (from -r requirements.txt (line 10))
  Using cached google_auth-2.40.3-py2.py3-none-any.whl.metadata (6.2 kB)
Collecting google_auth_oauthlib==1.2.2 (from -r requirements.txt (line 11))
  Using cached google_auth_oauthlib-1.2.2-py3-none-any.whl.metadata (2.7 kB)
Collecting google-cloud-core==2.4.3 (from -r requirements.txt (line 12))
  Using cached google_cloud_core-2.4.3-py2.py3-none-any.whl.metadata (2.7 kB)
Collecting json-repair==0.44.1 (from -r requirements.txt (line 13))
  Using cached json_repair-0.44.1-py3-none-any.whl.metadata (12 kB)
Collecting pip-install==1.3.5 (from -r requirements.txt (line 14))
  Using cached pip_install-1.3.5-py3-none-any.whl.metadata (907 bytes)
Collecting langchain==1.1.2 (from -r requirements.txt (line 15))
  Using cached langchain-1.1.2-py3-none-any.whl.metadata (4.9 kB)
Collecting langchain-aws==1.1.0 (from -r requirements.txt (line 16))
  Using cached langchain_aws-1.1.0-py3-none-any.whl.metadata (1.9 kB)
Collecting langchain-anthropic==1.2.0 (from -r requirements.txt (line 17))
  Using cached langchain_anthropic-1.2.0-py3-none-any.whl.metadata (2.6 kB)
Collecting langchain-fireworks==1.1.0 (from -r requirements.txt (line 18))
  Using cached langchain_fireworks-1.1.0-py3-none-any.whl.metadata (2.9 kB)
Collecting langchain-community==0.4.1 (from -r requirements.txt (line 19))
  Using cached langchain_community-0.4.1-py3-none-any.whl.metadata (3.0 kB)
Collecting langchain-core==1.2.5 (from -r requirements.txt (line 20))
  Using cached langchain_core-1.2.5-py3-none-any.whl.metadata (3.7 kB)
Collecting langchain-experimental==0.4.0 (from -r requirements.txt (line 21))
  Using cached langchain_experimental-0.4.0-py3-none-any.whl.metadata (1.3 kB)
Collecting langchain-google-vertexai==3.1.1 (from -r requirements.txt (line 22))
  Using cached langchain_google_vertexai-3.1.1-py3-none-any.whl.metadata (3.2 kB)
Collecting langchain-groq==1.1.0 (from -r requirements.txt (line 23))
  Using cached langchain_groq-1.1.0-py3-none-any.whl.metadata (2.4 kB)
Collecting langchain-openai==1.1.0 (from -r requirements.txt (line 24))
  Using cached langchain_openai-1.1.0-py3-none-any.whl.metadata (2.6 kB)
Collecting langchain-text-splitters==1.0.0 (from -r requirements.txt (line 25))
  Using cached langchain_text_splitters-1.0.0-py3-none-any.whl.metadata (2.6 kB)
Collecting langchain-huggingface==1.1.0 (from -r requirements.txt (line 26))
  Using cached langchain_huggingface-1.1.0-py3-none-any.whl.metadata (2.8 kB)
Collecting langchain-classic==1.0.0 (from -r requirements.txt (line 27))
  Using cached langchain_classic-1.0.0-py3-none-any.whl.metadata (3.9 kB)
Collecting langdetect==1.0.9 (from -r requirements.txt (line 28))
  Using cached langdetect-1.0.9-py3-none-any.whl
Collecting langsmith==0.4.55 (from -r requirements.txt (line 29))
  Using cached langsmith-0.4.55-py3-none-any.whl.metadata (15 kB)
Collecting langserve==0.3.3 (from -r requirements.txt (line 30))
  Using cached langserve-0.3.3-py3-none-any.whl.metadata (40 kB)
Collecting neo4j-rust-ext==5.28.2.1 (from -r requirements.txt (line 31))
  Using cached neo4j_rust_ext-5.28.2.1-cp312-cp312-macosx_11_0_arm64.whl.metadata (3.7 kB)
Collecting nltk==3.9.1 (from -r requirements.txt (line 32))
  Using cached nltk-3.9.1-py3-none-any.whl.metadata (2.9 kB)
Collecting openai==2.9.0 (from -r requirements.txt (line 33))
  Using cached openai-2.9.0-py3-none-any.whl.metadata (29 kB)
Collecting psutil==7.0.0 (from -r requirements.txt (line 34))
  Using cached psutil-7.0.0-cp36-abi3-macosx_11_0_arm64.whl.metadata (22 kB)
Collecting pydantic==2.12.5 (from -r requirements.txt (line 35))
  Using cached pydantic-2.12.5-py3-none-any.whl.metadata (90 kB)
Collecting python-dotenv==1.1.1 (from -r requirements.txt (line 36))
  Using cached python_dotenv-1.1.1-py3-none-any.whl.metadata (24 kB)
Collecting python-magic==0.4.27 (from -r requirements.txt (line 37))
  Using cached python_magic-0.4.27-py2.py3-none-any.whl.metadata (5.8 kB)
Collecting PyPDF2==3.0.1 (from -r requirements.txt (line 38))
  Using cached pypdf2-3.0.1-py3-none-any.whl.metadata (6.8 kB)
Collecting PyMuPDF==1.26.4 (from -r requirements.txt (line 39))
  Using cached pymupdf-1.26.4-cp39-abi3-macosx_11_0_arm64.whl.metadata (3.4 kB)
Collecting starlette==0.47.3 (from -r requirements.txt (line 40))
  Using cached starlette-0.47.3-py3-none-any.whl.metadata (6.2 kB)
Collecting sse-starlette==3.0.2 (from -r requirements.txt (line 41))
  Using cached sse_starlette-3.0.2-py3-none-any.whl.metadata (11 kB)
Collecting starlette-session==0.4.3 (from -r requirements.txt (line 42))
  Using cached starlette_session-0.4.3-py3-none-any.whl.metadata (4.0 kB)
Collecting tqdm==4.67.1 (from -r requirements.txt (line 43))
  Using cached tqdm-4.67.1-py3-none-any.whl.metadata (57 kB)
Collecting unstructured==0.18.14 (from unstructured[all-docs]==0.18.14->-r requirements.txt (line 44))
  Using cached unstructured-0.18.14-py3-none-any.whl.metadata (24 kB)
Collecting unstructured-client==0.42.3 (from -r requirements.txt (line 45))
  Using cached unstructured_client-0.42.3-py3-none-any.whl.metadata (23 kB)
Collecting unstructured-inference==1.0.5 (from -r requirements.txt (line 46))
  Using cached unstructured_inference-1.0.5-py3-none-any.whl.metadata (5.3 kB)
Collecting urllib3==2.6.2 (from -r requirements.txt (line 47))
  Using cached urllib3-2.6.2-py3-none-any.whl.metadata (6.6 kB)
Collecting uvicorn==0.35.0 (from -r requirements.txt (line 48))
  Using cached uvicorn-0.35.0-py3-none-any.whl.metadata (6.5 kB)
Collecting gunicorn==23.0.0 (from -r requirements.txt (line 49))
  Using cached gunicorn-23.0.0-py3-none-any.whl.metadata (4.4 kB)
Collecting wikipedia==1.4.0 (from -r requirements.txt (line 50))
  Using cached wikipedia-1.4.0-py3-none-any.whl
Collecting wrapt==1.17.3 (from -r requirements.txt (line 51))
  Using cached wrapt-1.17.3-cp312-cp312-macosx_11_0_arm64.whl.metadata (6.4 kB)
Collecting yarl==1.20.1 (from -r requirements.txt (line 52))
  Using cached yarl-1.20.1-cp312-cp312-macosx_11_0_arm64.whl.metadata (73 kB)
Collecting youtube-transcript-api==1.2.2 (from -r requirements.txt (line 53))
  Using cached youtube_transcript_api-1.2.2-py3-none-any.whl.metadata (24 kB)
Collecting zipp==3.23.0 (from -r requirements.txt (line 54))
  Using cached zipp-3.23.0-py3-none-any.whl.metadata (3.6 kB)
Collecting sentence-transformers==5.1.0 (from -r requirements.txt (line 55))
  Using cached sentence_transformers-5.1.0-py3-none-any.whl.metadata (16 kB)
Collecting google-cloud-logging==3.12.1 (from -r requirements.txt (line 56))
  Using cached google_cloud_logging-3.12.1-py2.py3-none-any.whl.metadata (5.0 kB)
Collecting pypandoc==1.15 (from -r requirements.txt (line 57))
  Using cached pypandoc-1.15-py3-none-any.whl.metadata (16 kB)
Collecting graphdatascience==1.18a1 (from -r requirements.txt (line 58))
  Using cached graphdatascience-1.18a1-py3-none-any.whl.metadata (7.8 kB)
Collecting Secweb==1.25.2 (from -r requirements.txt (line 59))
  Using cached secweb-1.25.2-py3-none-any.whl.metadata (19 kB)
Collecting ragas==0.4.0 (from -r requirements.txt (line 60))
  Using cached ragas-0.4.0-py3-none-any.whl.metadata (22 kB)
Collecting rouge_score==0.1.2 (from -r requirements.txt (line 61))
  Using cached rouge_score-0.1.2-py3-none-any.whl
Collecting langchain-neo4j==0.6.0 (from -r requirements.txt (line 62))
  Using cached langchain_neo4j-0.6.0-py3-none-any.whl.metadata (4.5 kB)
Collecting pypandoc-binary==1.15 (from -r requirements.txt (line 63))
  Using cached pypandoc_binary-1.15-py3-none-macosx_11_0_arm64.whl.metadata (16 kB)
Collecting chardet==5.2.0 (from -r requirements.txt (line 64))
  Using cached chardet-5.2.0-py3-none-any.whl.metadata (3.4 kB)
Collecting numpy>=1.17 (from accelerate==1.12.0->-r requirements.txt (line 1))
  Using cached numpy-2.4.3-cp312-cp312-macosx_14_0_arm64.whl.metadata (6.6 kB)
Collecting packaging>=20.0 (from accelerate==1.12.0->-r requirements.txt (line 1))
  Using cached packaging-26.0-py3-none-any.whl.metadata (3.3 kB)
Collecting pyyaml (from accelerate==1.12.0->-r requirements.txt (line 1))
  Using cached pyyaml-6.0.3-cp312-cp312-macosx_11_0_arm64.whl.metadata (2.4 kB)
INFO: pip is looking at multiple versions of accelerate to determine which version is compatible with other requirements. This could take a while.
ERROR: Cannot install -r requirements.txt (line 1) because these package versions have conflicting dependencies.

The conflict is caused by:
    accelerate 1.12.0 depends on torch>=2.0.0
    The user requested (constraint) torch==2.3.1+cpu

Additionally, some packages in these conflicts have no matching distributions available for your environment:
    torch

To fix this you could try to:
1. loosen the range of package versions you've specified
2. remove package versions to allow pip to attempt to solve the dependency conflict

ERROR: ResolutionImpossible: for help visit https://pip.pypa.io/en/latest/topics/dependency-resolution/#dealing-with-dependency-conflicts
((venv) ) (base) olivier@Mac backend % which pip
/tmp/llm-graph-builder/backend/venv/bin/pip
((venv) ) (base) olivier@Mac backend % which python
/tmp/llm-graph-builder/backend/venv/bin/python
((venv) ) (base) olivier@Mac backend % python -V
Python 3.12.12
((venv) ) (base) olivier@Mac backend % pip -V
pip 26.0.1 from tmp/llm-graph-builder/backend/venv/lib/python3.12/site-packages/pip (python 3.12)