Update the distributed_training.md Pytorch section

Initial Commit

doc.zih.tu-dresden.de/docs/software/distributed_training.md

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     This section is under construction
 
+Pytorch provides mutliple ways to acheieve data parallelism to train the deep learning models effieciently. These models are part of the `torch.distributed` sub-package that ships 
+with the main deep learning package.
+
 #### Using Multiple GPUs with PyTorch
 
 The example below shows how to solve that problem by using model parallelism, which in contrast to