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## Exercise 3: Create and approve a pull request
+**Note: Please ensure on GitHub, you create the pull request to the main branch of your forked repository. Under no circumstances should you create a pull request to the original PyTorch repository.**
+
+(make sure you choose *username*/pytorch instead of pytorch/pytorch)
+
+
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.