Without a doubt, Python 3 is the future of Python, and thus we will use Python 3 with PyTorch. While I summarize the instructions to install PyTorch with Python 3 here, the official PyTorch documentation should always provide up-to-date and comprehensive instructions for installation as well.
Make sure Python 3 is installed
First, we need to make sure that Python 3 is installed. Your system might already have it installed. First, you can see if the
python command is Python 3:
If the above is Python 3.x, then you can continue to the next section. Otherwise, you can see if
If this still doesn't work, then you need to install Python 3. First, install Homebrew:
curl -fsSL "https://raw.githubusercontent.com/Homebrew/install/master/install" | /usr/bin/ruby
Then you can use Homebrew to install Python 3:
brew install python3
In the future, make sure you run the appropriate Python command for Python 3 (either
python3), depending on your system.
Installing PyTorch and friends
First, we install
numpy (used for linear algebra computations),
matplotlib (useful for plotting) and
pandas (useful for loading data sets):
pip3 install --upgrade numpy pip3 install --upgrade matplotlib pip3 install --upgrade pandas
Finally we can install PyTorch:
pip3 install --upgrade torch torchvision
Testing the installation
Let's just quickly test the installation, to verify everything is installed and ready to go! Run the
python3 command), and type the following code into Python:
import numpy as np import pandas import matplotlib.pyplot as plt import torch x = torch.rand(5, 3) print(x)
If everything is installed correctly, you should see the output similar to:
tensor([[0.3380, 0.3845, 0.3217], [0.8337, 0.9050, 0.2650], [0.2979, 0.7141, 0.9069], [0.1449, 0.1132, 0.1375], [0.4675, 0.3947, 0.1426]])
If the above test produces errors, please carefully go through the official PyTorch installation guide to try to troubleshoot your problems.
Optional: Installing an IDE
At this point, everything we need for writing PyTorch code is installed. We can write our Python code in a text editor of our choice, and run it using
python from terminal. In the future I won't assume use of an IDE specifically, but rather assume that you can create new Python files and run them, either from terminal or an IDE. However, some people may prefer using an IDE, which can reduce the time spent in terminal, and help provide better syntax and semantic checking of Python code. Personally, I use and recommend PyCharm, which you can download for free here. I won't provide specific installation instructions, but I found it very easy to install and configure.