numpy: init set_thresh

numpy.py

@@ -3,6 +3,12 @@
 import numpy as np
 
 
+def set_thresh(values, thresh=1e-5):
+    val = values.copy()
+    val[val < thresh] = 0
+    return val
+
+
 def one_hot(a, n=None):
     if n is None:
         n = a.max() + 1