Add cuda example

experiments/example_cuda/descr.yaml

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+---
+# Experiment configuration
+total_epochs: 3
+rounds: 5
+epochs_per_cycle: 1
+wait_for_clients: true
+net: MNISTCNN
+dataset: mnist
+# Use cuda is available; setting to false will force CPU
+cuda: true
+profiling_time: 100
+warmup_round: false
+output_location: 'output/example_cuda'
+tensor_board_active: true
+clients_per_round: 2
+node_groups:
+  slow: [1, 1]
+  medium: [2, 2]
+  fast: [3, 3]
+sampler: "uniform" # "limit labels" || "q sampler" || "dirichlet" || "uniform" (default)
+sampler_args:
+  - 0.07     # label limit || q probability || alpha || unused
+  - 42    # random seed || random seed || random seed || unused
+num_clients: 10
+replications: 5

experiments/example_cuda/fedavg.cfg.yaml

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+# Individual configuration
+offload_stategy: vanilla
+deadline: 500
+single_machine: true
+real_time: false