fix normal with empty std

[ngimel]

1.10 version of #66463

[pytorch-probot]

CI Flow Status

⚛️ CI Flow

Ruleset - Version: v1
Ruleset - File: https://github.com/pytorch/pytorch/blob/6eb3f934b0e1eb552191667bc2371114ec4d2f72/.github/generated-ciflow-ruleset.json
PR ciflow labels: ciflow/default

Workflows	Labels (bold enabled)	Status
Triggered Workflows
linux-bionic-py3.6-clang9	ciflow/all, ciflow/cpu, ciflow/default, ciflow/linux, ciflow/noarch, ciflow/xla	✅ triggered
linux-bionic-py3.8-gcc9-coverage	ciflow/all, ciflow/coverage, ciflow/cpu, ciflow/default, ciflow/linux	✅ triggered
linux-xenial-cuda11.3-py3.6-gcc7	ciflow/all, ciflow/cuda, ciflow/default, ciflow/linux	✅ triggered
linux-xenial-py3.6-gcc5.4	ciflow/all, ciflow/cpu, ciflow/default, ciflow/linux	✅ triggered
linux-xenial-py3.6-gcc7-bazel-test	ciflow/all, ciflow/bazel, ciflow/cpu, ciflow/default, ciflow/linux	✅ triggered
win-vs2019-cpu-py3	ciflow/all, ciflow/cpu, ciflow/default, ciflow/win	✅ triggered
win-vs2019-cuda11.3-py3	ciflow/all, ciflow/cuda, ciflow/default, ciflow/win	✅ triggered
Skipped Workflows
libtorch-linux-xenial-cuda10.2-py3.6-gcc7	ciflow/all, ciflow/cuda, ciflow/libtorch, ciflow/linux	🚫 skipped
libtorch-linux-xenial-cuda11.3-py3.6-gcc7	ciflow/all, ciflow/cuda, ciflow/libtorch, ciflow/linux	🚫 skipped
linux-bionic-cuda10.2-py3.9-gcc7	ciflow/all, ciflow/cuda, ciflow/linux, ciflow/slow	🚫 skipped
linux-xenial-cuda10.2-py3.6-gcc7	ciflow/all, ciflow/cuda, ciflow/linux, ciflow/slow	🚫 skipped
parallelnative-linux-xenial-py3.6-gcc5.4	ciflow/all, ciflow/cpu, ciflow/linux	🚫 skipped
periodic-libtorch-linux-xenial-cuda11.1-py3.6-gcc7	ciflow/all, ciflow/cuda, ciflow/libtorch, ciflow/linux, ciflow/scheduled	🚫 skipped
periodic-linux-xenial-cuda11.1-py3.6-gcc7	ciflow/all, ciflow/cuda, ciflow/linux, ciflow/scheduled	🚫 skipped
periodic-win-vs2019-cuda11.1-py3	ciflow/all, ciflow/cuda, ciflow/scheduled, ciflow/win	🚫 skipped
puretorch-linux-xenial-py3.6-gcc5.4	ciflow/all, ciflow/cpu, ciflow/linux	🚫 skipped
win-vs2019-cuda10.2-py3	ciflow/all, ciflow/cuda, ciflow/win	🚫 skipped

You can add a comment to the PR and tag @pytorchbot with the following commands:

# ciflow rerun, "ciflow/default" will always be added automatically
@pytorchbot ciflow rerun

# ciflow rerun with additional labels "-l <ciflow/label_name>", which is equivalent to adding these labels manually and trigger the rerun
@pytorchbot ciflow rerun -l ciflow/scheduled -l ciflow/slow

For more information, please take a look at the CI Flow Wiki.

[facebook-github-bot]

🔗 Helpful links

• 🧪  See artifacts and rendered test results at hud.pytorch.org/pr/66524
• 📄  Preview docs built from this PR
• 📄  Preview C++ docs built from this PR
• ↩️  [fb-only] Re-run with SSH instructions
• 🔧  Opt-in to CIFlow to control what jobs run on your PRs

💊 CI failures summary and remediations

As of commit 6eb3f93 (more details on the Dr. CI page):

---

• 1/1 failures introduced in this PR

---

🕵️ 1 new failure recognized by patterns

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

linux-xenial-py3.6-gcc5.4 / test (backwards_compat, 1, 1, linux.2xlarge) (1/1)

Step: "Test" (full log | diagnosis details | 🔁 rerun)

2021-10-12T23:11:48.3852496Z RuntimeError:

2021-10-12T23:11:47.7741465Z Author: PyTorch Team
2021-10-12T23:11:47.7741968Z Author-email: packages@pytorch.org
2021-10-12T23:11:47.7742451Z License: BSD-3
2021-10-12T23:11:47.7742982Z Location: /opt/conda/lib/python3.6/site-packages
2021-10-12T23:11:47.7743631Z Requires: typing-extensions, dataclasses
2021-10-12T23:11:47.7744368Z Required-by: 
2021-10-12T23:11:47.7943915Z + python check_backward_compatibility.py --existing-schemas nightly_schemas.txt
2021-10-12T23:11:48.3850548Z Traceback (most recent call last):
2021-10-12T23:11:48.3851600Z   File "check_backward_compatibility.py", line 155, in <module>
2021-10-12T23:11:48.3852124Z     s = parse_schema(line.strip())
2021-10-12T23:11:48.3852496Z RuntimeError: 
2021-10-12T23:11:48.3853004Z Unknown custom class type cuda.Stream. Please ensure it is registered.:
2021-10-12T23:11:48.3854351Z cuda::default_stream.device(Device? device) -> (__torch__.torch.classes.cuda.Stream)
2021-10-12T23:11:48.3855130Z                                                                              ~~~~~~ <--- HERE
2021-10-12T23:11:48.3855354Z 
2021-10-12T23:11:48.4739442Z + cleanup
2021-10-12T23:11:48.4739785Z + retcode=1
2021-10-12T23:11:48.4740167Z + set +x
2021-10-12T23:11:48.4740529Z =================== sccache compilation log ===================
2021-10-12T23:11:48.4935941Z =========== If your build fails, please take a look at the log above for possible reasons ===========
2021-10-12T23:11:48.4956213Z Compile requests                      0

---

This comment was automatically generated by Dr. CI (expand for details).

Follow this link to opt-out of these comments for your Pull Requests.

Please report bugs/suggestions to the (internal) Dr. CI Users group.

Click here to manually regenerate this comment.

[codecov]

Codecov Report

Merging #66524 (6eb3f93) into release/1.10 (9509e8a) will increase coverage by 0.00%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##           release/1.10   #66524   +/-   ##
=============================================
  Coverage         66.32%   66.32%           
=============================================
  Files               738      738           
  Lines             94296    94296           
=============================================
+ Hits              62539    62541    +2     
+ Misses            31757    31755    -2