protect the descrpt to 1e-2 rather than set to 1

Author: Han Wang

source/train/DescrptSeA.py

@@ -290,8 +290,8 @@ def _compute_dstats_sys_smth (self,
 
     def _compute_std (self,sumv2, sumv, sumn) :
         val = np.sqrt(sumv2/sumn - np.multiply(sumv/sumn, sumv/sumn))
-        if val == 0:
-            val = 1
+        if np.abs(val) < 1e-2:
+            val = 1e-2
         return val
 
 

source/train/DescrptSeR.py

@@ -247,8 +247,8 @@ def _compute_dstats_sys_se_r (self,
 
     def _compute_std (self,sumv2, sumv, sumn) :
         val = np.sqrt(sumv2/sumn - np.multiply(sumv/sumn, sumv/sumn))
-        if val == 0:
-            val = 1
+        if np.abs(val) < 1e-2:
+            val = 1e-2
         return val