Fix out-of-range error for test_neg (#9431)

Will Feng · facebook-github-bot · commit 52abcdd0dc7c · 2018-07-16T10:26:54.000-07:00
Summary: `test_neg` sometimes fails internally because `random_()` can generate an out-of-range value for CharTensor. This PR fixes it. Pull Request resolved: #9431 Reviewed By: SsnL Differential Revision: D8843284 Pulled By: yf225 fbshipit-source-id: bf516cceb8f780e133fa54f7364c77821eb7c013
diff --git a/test/test_torch.py b/test/test_torch.py
@@ -1072,7 +1072,7 @@ def _test_neg(self, cast):
             if t in float_types:
                 a = cast(torch.randn(100, 90).type(t))
             else:
-                a = cast(torch.Tensor(100, 90).type(t).random_())
+                a = cast(torch.Tensor(100, 90).type(t).random_(-128, 128))
             zeros = cast(torch.Tensor().type(t)).resize_as_(a).zero_()
 
             if t == 'torch.ByteTensor':
