Avoid an unnecessary list creation in DataChunk

[bryant1410]

No description provided.

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• 🧪 See artifacts and rendered test results at hud.pytorch.org/pr/64111
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💊 CI failures summary and remediations

As of commit a4de2c4 (more details on the Dr. CI page):

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• 1/1 failures introduced in this PR

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🕵️ 1 new failure recognized by patterns

The following CI failures do not appear to be due to upstream breakages:

linux-bionic-py3.8-gcc9-coverage / test (default, 1, 2, linux.2xlarge) (1/1)

Step: "Display and upload test statistics (Click Me)" (full log | diagnosis details | 🔁 rerun)

2021-08-27T22:38:59.9930235Z RuntimeError: hello

2021-08-27T22:38:59.9924134Z -- Process 0 terminated with the following error:
2021-08-27T22:38:59.9924585Z Traceback (most recent call last):
2021-08-27T22:38:59.9925316Z   File "/opt/conda/lib/python3.8/site-packages/torch/multiprocessing/spawn.py", line 59, in _wrap
2021-08-27T22:38:59.9925842Z     fn(i, *args)
2021-08-27T22:38:59.9926575Z   File "/opt/conda/lib/python3.8/site-packages/torch/distributed/elastic/multiprocessing/api.py", line 382, in _wrap
2021-08-27T22:38:59.9927185Z     ret = record(fn)(*args_)
2021-08-27T22:38:59.9927982Z   File "/opt/conda/lib/python3.8/site-packages/torch/distributed/elastic/multiprocessing/errors/__init__.py", line 364, in wrapper
2021-08-27T22:38:59.9928636Z     return f(*args, **kwargs)
2021-08-27T22:38:59.9929245Z   File "/var/lib/jenkins/workspace/test/distributed/elastic/multiprocessing/api_test.py", line 134, in echo2
2021-08-27T22:38:59.9929858Z     raise RuntimeError(msg)
2021-08-27T22:38:59.9930235Z RuntimeError: hello
2021-08-27T22:38:59.9930465Z 
2021-08-27T22:38:59.9933085Z ok (1.333s)
2021-08-27T22:38:59.9963515Z   test_function_with_tensor (__main__.StartProcessesTest) ... ok (0.003s)
2021-08-27T22:38:59.9986325Z   test_invalid_log_dir (__main__.StartProcessesTest) ... ok (0.002s)
2021-08-27T22:39:00.0062283Z   test_multiprocess_context_close (__main__.StartProcessesTest) ... Closing process 18344 via signal SIGTERM
2021-08-27T22:39:00.0098166Z ok (0.011s)
2021-08-27T22:39:00.0157654Z   test_multiprocessing_context_poll_raises_exception (__main__.StartProcessesTest) ... failed (exitcode: -1) local_rank: 0 (pid: 123) of fn: echo0 (start_method: spawn)
2021-08-27T22:39:00.0158833Z Traceback (most recent call last):
2021-08-27T22:39:00.0159660Z   File "/opt/conda/lib/python3.8/site-packages/torch/distributed/elastic/multiprocessing/api.py", line 466, in _poll
2021-08-27T22:39:00.0160505Z     self._pc.join(-1)

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@ezyang has imported this pull request. If you are a Facebook employee, you can view this diff on Phabricator.

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@ezyang merged this pull request in 6b85c99.