[Prototype] PyTorch Mobile Lite Interpreter
PyTorch Lite Interpreter is a streamlined version of the PyTorch runtime that can execute PyTorch programs in resource constrained devices, with reduced binary size footprint. This prototype feature reduces binary sizes by up to 70% compared to the current on-device runtime in the current release. 
* iOS/Android Tutorial
Performance Optimization
In 1.8, we are releasing the support for benchmark utils to enable users to better monitor performance. We are also opening up a new automated quantization API. See the details below:
(Beta) Benchmark utils
Benchmark utils allows users to take accurate performance measurements, and provides composable tools to help with both benchmark formulation and post processing. This expected to be helpful for contributors to PyTorch to quickly understand how their contributions are impacting PyTorch performance.
Example:
```python