From 08daff4a3e4d7823568c9ccf0ffedebe064c31d4 Mon Sep 17 00:00:00 2001
From: suzusuzu <suzuzusu123@icloud.com>
Date: Tue, 13 Mar 2018 06:31:02 +0900
Subject: [PATCH] Fix softmax overflow

---
 src/nupic/algorithms/sdr_classifier.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/nupic/algorithms/sdr_classifier.py b/src/nupic/algorithms/sdr_classifier.py
index 2054811d3c..83bc21e031 100644
--- a/src/nupic/algorithms/sdr_classifier.py
+++ b/src/nupic/algorithms/sdr_classifier.py
@@ -374,6 +374,7 @@ def inferSingleStep(self, patternNZ, weightMatrix):
     outputActivation = weightMatrix[patternNZ].sum(axis=0)
 
     # softmax normalization
+    outputActivation = outputActivation - numpy.max(outputActivation)
     expOutputActivation = numpy.exp(outputActivation)
     predictDist = expOutputActivation / numpy.sum(expOutputActivation)
     return predictDist