Fix results save location

This addresses the issue of failing to write the genotype.json
when the directory does not exist. This is one of the simpler solutions,
and keeps things consistent with the defaul_model.txt of the advanced
example.

Author: yngtodd

examples/darts/uno/default_model.txt

@@ -1,7 +1,7 @@
 [Global_Params]
 model_name = 'darts_uno'
 data_url = 'http://ftp.mcs.anl.gov/pub/candle/public/benchmarks/Pilot1/uno/' 
-savepath = '.'
+savepath = './results'
 log_interval = 10
 train_data = 'top_21_auc_1fold.uno.h5'
 learning_rate = 0.025
@@ -10,6 +10,6 @@ momentum = 0.9
 weight_decay = 3e-4
 grad_clip = 5 
 batch_size = 100
-epochs = 10
+epochs = 1
 seed = 13
 

examples/darts/uno/results/.gitkeep

@@ -33,7 +33,7 @@ def run(params):
     args = candle.ArgumentStruct(**params)
 
     args.cuda = torch.cuda.is_available()
-    device = torch.device(f"cuda" if args.cuda else "cpu")
+    device = torch.device(f"cuda" if args.cuda else f"cpu")
     darts.banner(device=device)
 
     train_data = darts.Uno('./data', 'train', download=True)