cleaned up demos

examples/multi_node_examples/minimal_multi_node_demo.py

@@ -0,0 +1,24 @@
+from pytorch_lightning import Trainer
+from test_tube import Experiment
+import os
+
+
+def main():
+    # use the cool model from the main README.md
+    model = CoolModel()  # noqa: F821
+    exp = Experiment(save_dir=os.getcwd())
+
+    # train on 4 GPUs across 4 nodes
+    trainer = Trainer(
+        experiment=exp,
+        distributed_backend='ddp',
+        max_nb_epochs=10,
+        gpus=4,
+        nb_gpu_nodes=4
+    )
+
+    trainer.fit(model)
+
+
+if __name__ == '__main__':
+    main()