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"From PyTorch to PyTorch Lightning" outdated

See original GitHub issue

🐛 Bug

When using the example code from the documentation “From PyTorch to PyTorch Lightning”. In the newest version 0.7.1 you get the error AttributeError: 'LightningMNISTClassifier' object has no attribute 'mnist_val'.

To Reproduce

Steps to reproduce the behavior:

Install version 0.7.1 from pytorch-ignite
Copy Code at the bottom of the page from the doc “From PyTorch to PyTorch Lightning”
Run it
See error

Stacktrace

  File "D:\Programme\Anaconda3\envs\pytorch\lib\site-packages\pytorch_lightning\trainer\trainer.py", line 630, in fit
    self.run_pretrain_routine(model)
  File "D:\Programme\Anaconda3\envs\pytorch\lib\site-packages\pytorch_lightning\trainer\trainer.py", line 796, in run_pretrain_routine
    self.reset_val_dataloader(ref_model)
  File "D:\Programme\Anaconda3\envs\pytorch\lib\site-packages\pytorch_lightning\trainer\data_loading.py", line 154, in reset_val_dataloader
    self.val_dataloaders = self.request_data_loader(model.val_dataloader)
  File "D:\Programme\Anaconda3\envs\pytorch\lib\site-packages\pytorch_lightning\trainer\data_loading.py", line 220, in request_data_loader
    data_loader = data_loader_fx()
  File "C:/Users/schup/PycharmProjects/Workspace/pytorch_test/GAN/cnn_from_towardsdatascience.py", line 85, in val_dataloader
    mnist_val = DataLoader(self.mnist_val, batch_size=64)
  File "D:\Programme\Anaconda3\envs\pytorch\lib\site-packages\torch\nn\modules\module.py", line 576, in __getattr__
    type(self).__name__, name))
AttributeError: 'LightningMNISTClassifier' object has no attribute 'mnist_val'

Code sample

Code Article

Expected behavior

The example should provide a working MNIST classifier.

Environment

PyTorch version: 1.4.0 Is debug build: No CUDA used to build PyTorch: 10.1

OS: Microsoft Windows 10 Pro GCC version: Could not collect CMake version: Could not collect

Python version: 3.7 Is CUDA available: Yes CUDA runtime version: 10.2.89 GPU models and configuration: GPU 0: GeForce GTX 1050 Ti Nvidia driver version: 442.19 cuDNN version: Could not collect

Versions of relevant libraries: [pip3] numpy==1.16.1 [conda] blas 1.0 mkl [conda] mkl 2020.0 166 [conda] mkl-service 2.3.0 py37hb782905_0 [conda] mkl_fft 1.0.15 py37h14836fe_0 [conda] mkl_random 1.1.0 py37h675688f_0 [conda] pytorch 1.4.0 py3.7_cuda101_cudnn7_0 pytorch [conda] pytorch-ignite 0.4.0.dev20200229 pypi_0 pypi [conda] pytorch-lightning 0.7.1 pypi_0 pypi [conda] torchvision 0.4.1 pypi_0 pypi [conda] torchviz 0.0.1 pypi_0 pypi