add tensorflow submodule on branch r1.4

Shen-En Shih · Shen-En Shih · commit 408292d57044 · 2018-01-08T15:07:59.000+08:00
diff --git a/.gitmodules b/.gitmodules
@@ -0,0 +1,4 @@
+[submodule "tensorflow"]
+	path = tensorflow
+	url = http://github.com/tensorflow/tensorflow.git
+	branch = r1.4
diff --git a/tensorflow b/tensorflow
@@ -0,0 +1 @@
+Subproject commit a77096897f1a8068ca8f57ffb6e3d9e28508cc27
