A few tests require downloading models from URLs such as
 <https://s3.amazonaws.com/download.onnx/models/opset_9/zfnet512.tar.gz>.
Skip those.

diff --git a/onnx/backend/test/runner/__init__.py b/onnx/backend/test/runner/__init__.py
index 049ed57b..f236f1bf 100644
--- a/onnx/backend/test/runner/__init__.py
+++ b/onnx/backend/test/runner/__init__.py
@@ -202,6 +202,7 @@ class Runner(object):
             print('Start downloading model {} from {}'.format(
                 model_test.model_name,
                 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='2023-06-09 14:19:14 +0200'>2023-06-09</span></td><td><a href='/guix/commit/tests/cpan.scm?id=f69d14d31af8325807d8529fccd3f0b6fd86e342'>tests: Ensure 'cpan' updater test does not access the network.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2023-05-31 23:50:06 +0200'>2023-05-31</span></td><td><a href='/guix/commit/tests/cpan.scm?id=654fcf9971bb01389d577be07c6ec0f68940c743'>tests: Use quasiquoted 'match' patterns for package sexps.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2023-05-31 23:25:25 +0200'>2023-05-31</span></td><td><a href='/guix/commit/tests/cpan.scm?id=a738c1a0c75af8b65ab5cad893e9ac2af6633d29'>import: cpan: Updater provides input list.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2023-05-31 23:25:25 +0200'>2023-05-31</span></td><td><a href='/guix/commit/tests/cpan.scm?id=c4fe4e7eb8ccbe5e8dcbcb8e64fbb3a97a498808'>import: cpan: Represent dependencies as &lt;upstream-input&gt; records.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>