added util.py

util.py

@@ -0,0 +1,18 @@
+import numpy as np
+import torch, argparse
+
+def str2bool(v):
+    if isinstance(v, bool):
+       return v
+    if v.lower() in ('yes', 'true', 't', 'y', '1'):
+        return True
+    elif v.lower() in ('no', 'false', 'f', 'n', '0'):
+        return False
+    else:
+        raise argparse.ArgumentTypeError('Boolean value expected.')
+
+def str2tuple(s):
+    return tuple(s.split('_'))
+
+def s2ituple(s):
+    return tuple(int(_s) for _s in s.split('_'))