Merge pull request NVIDIA#157 from annikabrundyn/main

Update readme to include system requirements

federated_learning/README.md

@@ -10,6 +10,12 @@ All our FL code can be found in the `train-tabformer` folder. Inside you'll see
 
 Below you'll find a step-by-step guide on how to setup and run this project.
 
+## Requirements
+
+In order to run this example as is, you'll need two GPUs on your local machine since each client trains a model independently.
+
+However, if you don't have two GPUs available and would like to train on a single GPU, you can modify the code as follows: in `train-tabformer/custom/tabformer-lstm-trainer.py` on line 84, and in `train-tabformer/custom/tabformer-lstm-validator.py` on line 56 set `gpu_id = 0`.
+
 ## Instructions
 
 First, you'll need to setup the data and virtual environment following the steps in the file [`0_Setup.md`](/0_Setup.md).