Exercises

Deliverables:

You will perform three tasks in this exercise.

• Create and fix a merge conflict
• Amend a commit
• Create and approve a pull request

It is strongly recommended that you use a git extension for your IDE to complete this lab. If you are using Visual Studio Code, you can use the GitLens extension.

Setup

1. Fork the PyTorch repository to your GitHub account.
2. Clone the forked repository to your local machine by running the following command in the terminal:

git clone -n --depth=1 --filter=tree:0 <your repo url>
cd pytorch
git sparse-checkout set --no-cone torch/nn
git checkout

3. Open the repository in your IDE.

Exercise 1: Create and fix a merge conflict

1. Create a new branch called merge-conflict from main branch.
2. Open the torch/nn/functional.py file, navigate to the interpolate function (line 3856) and change the resizing mode from nearest to bilinear:
3. Commit the changes to the merge-conflict branch. Make sure you add a meaningful commit message.
4. Switch back to main branch.
5. Open the torch/nn/functional.py file, navigate to the interpolate(line 3856) function and change the resizing mode from nearest to bicubic and align_corners to True:
6. Commit the changes to the main branch. Make sure you add a meaningful commit message.
7. Merge the merge-conflict branch into the main branch.
8. Resolve the merge conflict by keeping the resizing mode bilinear and align_corners True.
9. Commit the changes to the main branch. Make sure you add a meaningful commit message.

Exercise 2: Amend a commit

1. Create a new branch called amend-commit from main branch.
2. In the torch/nn/functional.py file, navigate to the multi_margin_loss function (line 3566) and change the margin to 1.5 and reduction mode to `sum'
3. Commit the changes to the amend-commit branch. Make sure you add a meaningful commit message.
4. Amend the commit by changing the margin to 2.0
5. Commit the changes to the amend-commit branch. Make sure you add a meaningful commit message.

Exercise 3: Create and approve a pull request

1. Create a new branch called pull-request from main branch.
2. In the torch/nn/functional.py file, navigate to the l1_loss function (line 3308) and add code to check if the reduction mode is sum and raise an exception:
3. Commit the changes to the pull-request branch. Make sure you add a meaningful commit message.
4. Push the pull-request branch to the remote repository.
5. Create a pull request to merge the pull-request branch into the main branch.
6. Approve the pull request.
7. Merge the pull-request branch into the main branch.

Useful commands

• git checkout -b <branch-name> - creates a new branch and switches to it
• git checkout <branch-name> - switches to the specified branch
• git merge <branch-name> - merges the specified branch into the current branch
• git status - shows the status of the current branch
• git add <file-name> - adds the specified file to the staging area
• git commit -m "<commit-message>" - commits the staged changes with the specified commit message
• git log - shows the commit history
• git log --oneline - shows the commit history with each commit on a single line
• git log --oneline --graph - shows the commit history with each commit on a single line and the branches graph
• git push origin <branch-name> - pushes the specified branch to the remote repository
• git pull origin <branch-name> - pulls the specified branch from the remote repository
• git branch -d <branch-name> - deletes the specified branch
• git commit --amend - amends the last commit
• git push origin --delete <branch-name> - deletes the specified branch from the remote repository

Resources

• Git Handbook
• Git Cheat Sheet
• Git Documentation
• Git Exercises