Splitting out normalization

utils.py

+import numpy as np
+
+
+def normalize(data_n, mean=0, std=1):
+    data_n -= np.mean(data_n)
+    emp_std = np.std(data_n)
+    if np.isfinite(1. / emp_std):
+        data_n /= emp_std
+
+    return data_n * std + mean
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