Issue description

CosineAnealingLr in torch/optim/lr_scheduler.pyi must be renamed to CosineAnealingLR

Code example

from torch.optim.lr_scheduler import CosineAnealingLr

Error Message

ImportError: cannot import name 'CosineAnnealingLr' from 'torch.optim.lr_scheduler'

System Info

PyTorch version: 1.1.0
Is debug build: No
CUDA used to build PyTorch: 9.0.176

OS: Ubuntu 18.04.2 LTS
GCC version: (Ubuntu 7.4.0-1ubuntu1~18.04.1) 7.4.0
CMake version: Could not collect

Python version: 3.7
Is CUDA available: Yes
CUDA runtime version: Could not collect
GPU models and configuration: GPU 0: GeForce GTX 1050 Ti
Nvidia driver version: 418.67
cuDNN version: /usr/lib/x86_64-linux-gnu/libcudnn.so.7.6.1

Versions of relevant libraries:
[pip] efficientnet-pytorch==0.3.0
[pip] numpy==1.16.2
[pip] numpydoc==0.8.0
[pip] torch==1.1.0
[pip] torchvision==0.3.0
[conda] blas 1.0 mkl
[conda] efficientnet-pytorch 0.3.0 pypi_0 pypi
[conda] mkl 2019.3 199
[conda] mkl-service 1.1.2 py37he904b0f_5
[conda] mkl_fft 1.0.10 py37ha843d7b_0
[conda] mkl_random 1.0.2 py37hd81dba3_0
[conda] torch 1.1.0 pypi_0 pypi
[conda] torchvision 0.3.0 pypi_0 pypi