Step 1: Install the necessary dependencies

• Install Xcode Command Line Tools by running the following command in your terminal:

  xcode-select --install
  

• Install Homebrew(arm64 version is indeed), a package manager for macOS, by following the instructions on the Homebrew website: https://brew.sh/

• Use Homebrew to install additional dependencies required for building PyTorch:

  brew install cmake pkg-config libomp llvm openblas gmp mpfr libmpc
  

Step 2: Create and activate a Conda environment

• Install Anaconda or Miniconda, which will allow you to create isolated Python environments, by following the instructions on the official website: https://www.anaconda.com/products/distribution or https://docs.conda.io/en/latest/miniconda.html

• Create a new Conda environment named "pytorch-build" with Python 3.8:

  conda create -n pytorch-build python=3.10
  

• Activate the newly created Conda environment:

  conda activate pytorch-build
  

Step 3: Clone the PyTorch repository

• Open a terminal and navigate to the directory where you want to clone the PyTorch repository.

• Clone the PyTorch repository, including its submodules, by running the following command:

  git clone --recursive <https://github.com/pytorch/pytorch>
  

• Change to the newly created pytorch directory:

  cd pytorch
  

Step 4: Install Python dependencies from requirements.txt

• Ensure you are still in the pytorch directory.

• Install the Python dependencies listed in the requirements.txt file:

  pip install -r requirements.txt
  

Step 5: Check out the PyTorch Nightly branch

• In the pytorch directory, run the following command to switch to the Nightly branch:

  git checkout nightly
  

Step 6: Build and install PyTorch

• Modify the CMakeLists.txt file to disable the Werror flag:

  • Open the CMakeLists.txt file located in the root directory of the PyTorch repository using a text editor.

  • Look for the line that contains Werror and comment it out by adding a # at the beginning of the line. For example:

    #append_cxx_flag_if_supported("-Werror=return-type" CMAKE_CXX_FLAGS)
    #append_cxx_flag_if_supported("-Werror=non-virtual-dtor" CMAKE_CXX_FLAGS)
    #append_cxx_flag_if_supported("-Werror=braced-scalar-init" CMAKE_CXX_FLAGS)
    #append_cxx_flag_if_supported("-Werror=range-loop-construct" CMAKE_CXX_FLAGS)
    #append_cxx_flag_if_supported("-Werror=bool-operation" CMAKE_CXX_FLAGS)
    

• Save the changes and close the file.