Deprecation warnings for torch 1.5

[fmigneault]

(BatchNormImpl at <TORCH_ROOT>\torch\csrc\api\src\nn\modules\batchnorm.cpp:21)
Warning: torch::nn::BatchNorm module is deprecated and will be removed in 1.5. Use BatchNorm{1,2,3}d instead. 

Warning: The enum value `torch::nn::init::Nonlinearity::ReLU` is deprecated and will be removed in 1.5. Please use `torch::kReLU` instead. (_compute_nonlinearity_type at <TORCH_ROOT>\torch\csrc\api\src\nn\init.cpp:63)

Warning: The enum value `torch::nn::init::FanMode::FanOut` is deprecated and will be removed in 1.5. Please use `torch::kFanOut` instead. (_compute_fanmode_type at <TORCH_ROOT>\torch\torch\csrc\api\src\nn\init.cpp:78)

[fmassa]

We will happily accept PRs fixing the deprecation warnings.

[fmigneault]

@fmassa
Not too sure if the failing build steps are related?
If so, guidance would be appreciated as I didn't touch python parts, so I don't know how it leads to this.

[fmassa]

@fmigneault the failing tests were unrelated to your change and have been fixed in the current version in master, thanks for the PR!