Baruch

## What does this PR do? Wrote unit test for the CIFAR10 dataset and made the dataset import from torchvision to reduce code redundancy as outlined in #839. ## Before...

Multiple colab notebooks from the documentation don't work and get stuck on the imports

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## 🐛 Bug At a minimum, the notebooks at https://pytorch-lightning.readthedocs.io/en/latest/notebooks/lightning_examples/mnist-hello-world.html and https://pytorch-lightning.readthedocs.io/en/latest/notebooks/lightning_examples/cifar10-baseline.html don't work on colab when going there through the "colab" link at the top of the page. When...

## What does this PR do? Continuation of #887 and replaces our iou and giou with torchvision versions. Fixes part of #839 ## Before submitting - [x] Was this **discussed/approved**...

Documentation is missing for pl_bolts/metrics/aggregation.py

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## 📚 Documentation The documentation for [pl_bolts/metrics/aggregation.py](https://github.com/Lightning-AI/lightning-bolts/blob/master/pl_bolts/metrics/aggregation.py) seems to be missing and `accuracy` is missing its docstring. I assume that it should look more like https://github.com/Lightning-AI/lightning-bolts/blob/master/pl_bolts/metrics/object_detection.py. I don't think that...