Handle save paths that do not exist

This gives the genotype storage a way to create paths that do not
exist before trying to save the genotype.json there.

Author: yngtodd

common/darts/storage/genotype.py

@@ -23,6 +23,7 @@ def save_genotype(self, genotype: Genotype, filename='genotype.json') -> None:
             filename: name of the save file
         """
         genotype = self._replace_range(genotype)
+        os.makedirs(self.root, exist_ok=True)
         path = os.path.join(self.root, filename)
         with open(path, 'w') as outfile:
             json.dump(genotype, outfile)

examples/darts/uno/results/.gitkeep

@@ -70,7 +70,7 @@ def run(params):
     train_meter = darts.EpochMeter(tasks, 'train')
     valid_meter = darts.EpochMeter(tasks, 'valid')
 
-    genotype_store = darts.GenotypeStorage(root=args.savepath)
+    genotype_store = darts.GenotypeStorage(root=args.save_path)
 
     for epoch in range(args.epochs):
 
@@ -161,7 +161,7 @@ def train(trainloader,
             logger.info(f'Step: {step} loss: {meter.loss_meter.avg:.4}')
 
     meter.update_epoch()
-    meter.save(args.savepath)
+    meter.save(args.save_path)
 
 
 
@@ -186,7 +186,7 @@ def validate(validloader, model, criterion, args, tasks, meter, device):
                 logger.info(f'>> Validation: {step} loss: {meter.loss_meter.avg:.4}')
 
     meter.update_epoch()
-    meter.save(args.savepath)
+    meter.save(args.save_path)
 
 
 def main():