fix VolumetricMaxPooling test instability (pytorch#952)

Author: soumith

test/test_legacy_nn.py

@@ -483,7 +483,7 @@ def _do_test(self, test_case, module, input):
  input_size=(1, 2, 4, 4, 4)),
  OldModuleTest(nn.VolumetricMaxPooling,
  (2, 2, 2),
- input_size=(2, 3, 5, 5, 5)),
+ input=(torch.randn(2, 3, 5, 5, 5) * 1000)),
  OldModuleTest(nn.VolumetricMaxPooling,
  (2, 2, 2, 2, 2, 2),
  input_size=(2, 3, 5, 5, 5),