Fixed typo.

climax/core/dataset.py

@@ -136,7 +136,7 @@ class EoDataset(torch.utils.data.Dataset):
             state_file = '_'.join([state_file, repr(loss).strip('()')])
 
         # add suffix for weight decay values
-        state_file = (''.join([state_file, 'd{:.0e}'.format(decay)]) if decay
+        state_file = ('_'.join([state_file, 'd{:.0e}'.format(decay)]) if decay
                       is not None else state_file)
 
         # add suffix for training with anomalies