A few tests require downloading models. Skip those.

diff --git a/onnx/backend/test/runner/__init__.py b/onnx/backend/test/runner/__init__.py
index 5b60e7c0..838c7ba5 100644
--- a/onnx/backend/test/runner/__init__.py
+++ b/onnx/backend/test/runner/__init__.py
@@ -236,6 +236,7 @@ class Runner:
             print(
                 f"Start downloading model {model_test.model_name} from {model_test.url}"
             )
+            raise unittest.SkipTest('Skipping download')
             urlretrieve(model_test.url, download_file.name)
             print("Done")
             with tarfile.open(download_file.name) as t:
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<tr><td><span title='2019-12-19 11:35:23 -0600'>2019-12-19</span></td><td><a href='/guix/commit/gnu/packages/sml.scm?id=4b3ff36228da17db980c98fe9e1669be613a5402'>Update email for Brett Gilio.</a><span class='msg-avail'>...<span class='msg-tooltip'>* .mailmap: Add name and email for Brett Gilio.
* gnu/local.mk, gnu/packages/admin.scm, gnu/packages/audio.scm,
  gnu/packages/bittorrent.scm, gnu/packages/build-tools.scm,
  gnu/packages/cran.scm, gnu/packages/emacs-xyz.scm,
  gnu/packages/messaging.scm, gnu/packages/python-xyz.scm,
  gnu/packages/sml.scm, gnu/packages/terminals.scm, gnu/packages/wm.scm:
  Update email for Brett Gilio.
</span></span></td><td>Brett Gilio</td></tr>
<tr><td><span title='2019-11-22 22:53:39 +0100'>2019-11-22</span></td><td><a href='/guix/commit/gnu/packages/sml.scm?id=116787d4adb89351ef7ad3f625c5138267f7740b'>gnu: polyml: Use HTTPS home page URI.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/sml.scm (polyml)[home-page]: Use HTTPS URI.

Signed-off-by: Tobias Geerinckx-Rice &lt;me@tobias.gr&gt;
</span></span></td><td>Brett Gilio</td></tr>
<tr><td><span title='2019-11-22 22:51:20 +0100'>2019-11-22</span></td><td><a href='/guix/commit/gnu/packages/sml.scm?id=8717fb8d5f30915999869e80782ae0fcf1c6698d'>gnu: polyml: Update to 5.8.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/sml.scm (polyml): Update to 5.8.

Signed-off-by: Tobias Geerinckx-Rice &lt;me@tobias.gr&gt;
</span></span></td><td>Brett Gilio</td></tr>