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Monday, August 15, 2022

Top 7 Free Cyber Security Newsletters

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Tuesday, August 09, 2022

[Solved] Error: No such keg: /usr/local/Cellar/gcc

If you are facing issues with Homebrew while installing or updating the GCC package (or any other module), follow this guide.

The error occurred for me recently during my periodic homebrew updates on my MacBook Pro.

devharsh@Devharshs-MacBook-Pro ~ % brew update && brew upgrade && brew cleanup

Already up-to-date.

Warning: Skipping gcc: most recent version 12.1.0 not installed

For some reason, I had a warning flashing up for GCC. So I tried to install the missing version.

devharsh@Devharshs-MacBook-Pro ~ % brew install -f gcc@12

Error: gcc 12.1.0_1 is already installed

To install 12.1.0, first run:

brew unlink gcc

Which unsurprisingly did not work, so I tried unlinking it.

devharsh@Devharshs-MacBook-Pro ~ % brew unlink gcc

Error: No such keg: /usr/local/Cellar/gcc

And this failed too, hence this post! After some troubleshooting, I could fix the issue.

Google Colaboratory, or “Colab” for short, is a product from Google Research. Colab allows anybody to write and execute arbitrary python code through the browser and is especially well suited to machine learning, data analysis, and education. More technically, Colab is a hosted Jupyter notebook service that requires no setup to use while providing access free of charge to computing resources, including GPUs.

By default, it starts the runtime with Python version 3.7. If you want to upgrade the version in your current notebook, then follow these steps in the given order:

1) !python --version

Python 3.7.13

2) !sudo apt-get update -y

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Ign:10 https://developer.download.nvidia.com/compute/machine-learning/repos/ubuntu1804/x86_64  InRelease

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Fetched 14.5 MB in 9s (1,578 kB/s)

Reading package lists... Done

[How To] Install Pyfhel in macOS

Tested on Intel-based (x86_64) MacBook, not tested on M1/M2 (ARM)
Apple Clang does not support -fopenmp and -libseal, use GCC or CLANG

% git clone --recursive https://github.com/ibarrond/Pyfhel

2.a) create requirements.txt file

  "setuptools<=60.9",
  "wheel",
  "cython>=3.0.0a9",
  "numpy>=1.20",
  "cmake>=3.15",
  "toml>=0.10"

2.b) % pip3 install -r requirements.txt

edit pyproject.toml

Line #111 [Afhel]

extra_compile_args

{Darwin = ["-std=c++17","-O3","-fopenmp"]},

extra_link_args

{Darwin = ["-fopenmp","-dynamiclib"]},

Repeat the above for [CYTHON EXTENSIONS]

[Solved] Jupyter notebook raises Module Not Found Error

I recently ran into issues on my MacBook with Jupyter notebooks, where it could not find any packages and was throwing "ModuleNotFoundError: No module named ****" for several libraries. I already had these packages installed but somehow Jupyter python kernel could not find it. I tried to install these packages in the notebook cells with the command !pip install **** but this did not help either. I also tried %brew reinstall jupyterlab and that did not work as well.

Finally, I found a fix.

Solution:

Step-1: Install/upgrade jupyter packages:

% pip3 install --upgrade jupyter notebook jupyterlab

Step-2: Run jupyter with this command:

% jupyter-lab