issue599.patch

diff --git a/tools/sh_commands.py b/tools/sh_commands.py
index 4b029485..f34ded69 100644
--- a/tools/sh_commands.py
+++ b/tools/sh_commands.py
@@ -772,15 +772,7 @@ def packaging_lib(libmace_output_dir, project_name):
     six.print_("Start packaging '%s' libs into %s" % (project_name,
                                                       tar_package_path))
     which_sys = platform.system()
-    if which_sys == "Linux":
-        sh.tar(
-            "cvzf",
-            "%s" % tar_package_path,
-            glob.glob("%s/*" % project_dir),
-            "--exclude",
-            "%s/_tmp" % project_dir,
-            _fg=True)
-    elif which_sys == "Darwin":
+    if which_sys == "Linux" or which_sys == "Darwin":
         sh.tar(
             "--exclude",
             "%s/_tmp" % project_dir,
diff --git a/tools/validate.py b/tools/validate.py
index 9980a0a9..b16af3d8 100644
--- a/tools/validate.py
+++ b/tools/validate.py
@@ -64,7 +64,11 @@ def calculate_similarity(u, v, data_type=np.float64):
         u = u.astype(data_type)
     if v.dtype is not data_type:
         v = v.astype(data_type)
-    return np.dot(u, v) / (np.linalg.norm(u) * np.linalg.norm(v))
+    norm = (np.linalg.norm(u) * np.linalg.norm(v))
+    if norm == 0:
+        return 1;
+    else:
+        return np.dot(u, v) / norm
 
 
 def calculate_pixel_accuracy(out_value, mace_out_value):
@@ -454,4 +458,4 @@ if __name__ == '__main__':
              FLAGS.input_data_type,
              FLAGS.backend,
              FLAGS.validation_outputs_data,
-             FLAGS.log_file)
+             "")