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Update CONTRIBUTING.md

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# Contributing
Welcome to the PyTorch Lightning community! We're building the most advanced research platform on the planet to implement the latest, best practices that the amazing PyTorch team rolls out!
## Core value 1: One less thing to remember
## Main Core Value: One less thing to remember
Simplify the API as much as possible from the user perspective. Any additions or improvements should minimize things the user needs to remember.
For example: One benefit of the validation_step is that the user doesn't have to remember to set the model to .eval(). This avoids all sorts of subtle errors the user could make.
## Core value 2: Backward-compatible API
We all hate updating our deep learning packages because we don't want to refactor a bunch of stuff. In Lightning, we make sure every change we make which could break an API is backwards compatible with good deprecation warnings.
You shouldn't be afraid to upgrade Lightning :)
## Lightning Design Principles
We encourage all sorts of contributions you're interested in adding! When coding for lightning, please follow these principles.
#### No PyTorch interference
We don't want to add any abstractions on top of pure PyTorch. This gives researchers all the control they need without having to learn yet another framework.
@ -28,6 +22,11 @@ When something becomes a best practice, we add it to the framework. This likely
#### Simple External API
What makes sense to you may not make sense to others. Create an issue with an API change suggestion and validate that it makes sense for others. Treat code changes how you treat a startup: validate that it's a needed feature, then add if it makes sense for many people.
#### Backward-compatible API
We all hate updating our deep learning packages because we don't want to refactor a bunch of stuff. In Lightning, we make sure every change we make which could break an API is backwards compatible with good deprecation warnings.
You shouldn't be afraid to upgrade Lightning :)
#### Gain User Trust
As a researcher you can't have any part of your code going wrong. So, make thorough tests that ensure an implementation of a new trick or subbtle change is correct.