pip install -r requirements.txt not installing libraries in vs code virtual environement

Question

I have created virtual environment in VS code. When i am doing the command pip install -r requirements.txt.

Still the vs code says no such module found. However, if i individually do pip install and it works like a charm. why ? My requirements.txt file are

Flask==1.1.2
joblib==1.0.1
keras==2.6.0
matplotlib==3.3.4
numpy==1.21.2
pandas==1.3.3
requests==2.25.1
scikit_learn==1.0.2
seaborn==0.11.1
xgboost==1.5.1
utils==1.0.1
jellyfish==0.8.9
langdetect==1.0.9
nltk==3.6.1
spacy==3.2.0
textblob==0.17.1
vaderSentiment==3.3.2
ipython==7.30.1
gapminder==0.1
mlxtend==0.19.0
networkx==2.5
squarify==0.4.3
pandas-profiling==3.1.0
plotly==5.3.1
scikit_image==0.18.1
scipy==1.7.1
nbformat
squarify==0.4.3
gapminder==0.1
tensorflow==2.7
ipywidgets

Answer 1

Maybe a dependency conflict: tensorflow 2.7.0 depends on keras<2.8 and >=2.7.0rc0?

When the dependencies are installed with pip install -r requirements.txt the installation of tensorflow is aborted, because of the conflict.

When the dependencies are installed one by one keras 2.6.0 is installed first, then tensorflow 2.7.0. During the installation of tensorflow 2.7.0 keras 2.6.0 is removed and replaced with keras-2.7.0.

Installing collected packages: keras
  Attempting uninstall: keras
    Found existing installation: keras 2.6.0
    Uninstalling keras-2.6.0:
      Successfully uninstalled keras-2.6.0
Successfully installed keras-2.7.0

Answer 2

With Python 3.10 I got this error when using your requirements.txt:

ERROR: Could not find a version that satisfies the requirement scipy==1.7.1 
(from versions: 0.8.0, 0.9.0, 0.10.0, 0.10.1, 0.11.0, 0.12.0, 0.12.1, 0.13.0, 0.13.1,
0.13.2, 0.13.3, 0.14.0, 0.14.1, 0.15.0, 0.15.1, 0.16.0, 0.16.1, 0.17.0, 0.17.1, 0.18.0,
0.18.1, 0.19.0, 0.19.1, 1.0.0b1, 1.0.0rc1, 1.0.0rc2, 1.0.0, 1.0.1, 1.1.0rc1, 1.1.0,
1.2.0rc1, 1.2.0rc2, 1.2.0, 1.2.1, 1.2.2, 1.2.3, 1.3.0rc1, 1.3.0rc2, 1.3.0, 1.3.1, 1.3.2,
1.3.3, 1.4.0rc1, 1.4.0rc2, 1.4.0, 1.4.1, 1.5.0rc1, 1.5.0rc2, 1.5.0, 1.5.1, 1.5.2, 1.5.3,
1.5.4, 1.6.0rc1, 1.6.0rc2, 1.6.0, 1.6.1, 1.7.2, 1.7.3, 1.8.0rc1, 1.8.0rc2, 1.8.0rc3,
1.8.0rc4, 1.8.0)
ERROR: No matching distribution found for scipy==1.7.1

I suggest utilizing pip-compile to come up with a compatible list of modules. You'll pin your wanted modules and desired version in requirements.in, then run pip-compile to generate your requirements.txt. From here, install from your requirements.txt like normal.

Answer 3

I think this might happen, because you install it to python global env. Try to add the name of your venv when calling pip install like so:

pip install -r requirements.txt -e <your current environment>

For more details, refer to the official docs.