New Feature: add DropBlock layer

[xiaohu2015]

As discussed in #5414, I am working to add DropBlock layer to Torchvision.

[facebook-github-bot]

💊 CI failures summary and remediations

As of commit 68d1ab3 (more details on the Dr. CI page):

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• 2/2 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:

CodeQL / build (1/1)

Step: "Perform CodeQL Analysis" (full log | diagnosis details | 🔁 rerun)

2022-02-13T13:21:01.1687526Z ##[error]source repository for pull request could not be determined

2022-02-13T13:20:58.9488775Z [command]/opt/hostedtoolcache/CodeQL/0.0.0-20220128/x64/codeql/codeql database cleanup /home/runner/work/_temp/codeql_databases/cpp --mode=brutal
2022-02-13T13:20:59.7853168Z Cleaning up existing TRAP files after import...
2022-02-13T13:20:59.7941337Z TRAP files cleaned up (2ms).
2022-02-13T13:20:59.7941971Z Cleaning up scratch directory...
2022-02-13T13:20:59.7961556Z Scratch directory cleaned up (0ms).
2022-02-13T13:20:59.9296066Z ##[endgroup]
2022-02-13T13:20:59.9296829Z 
2022-02-13T13:20:59.9551762Z ##[group]Uploading results
2022-02-13T13:20:59.9552635Z Processing sarif files: ["/home/runner/work/vision/results/cpp.sarif","/home/runner/work/vision/results/python.sarif"]
2022-02-13T13:21:00.4263519Z Uploading results
2022-02-13T13:21:01.1687526Z ##[error]source repository for pull request could not be determined
2022-02-13T13:21:01.1711275Z RequestError [HttpError]: source repository for pull request could not be determined
2022-02-13T13:21:01.1712043Z     at /home/runner/work/_actions/github/codeql-action/v1/node_modules/@octokit/request/dist-node/index.js:66:23
2022-02-13T13:21:01.1712424Z     at processTicksAndRejections (node:internal/process/task_queues:96:5)
2022-02-13T13:21:01.1712915Z     at async Job.doExecute (/home/runner/work/_actions/github/codeql-action/v1/node_modules/bottleneck/light.js:405:18) {
2022-02-13T13:21:01.1713219Z   status: 422,
2022-02-13T13:21:01.1713419Z   headers: {
2022-02-13T13:21:01.1713684Z     'access-control-allow-origin': '*',
2022-02-13T13:21:01.1714781Z     'access-control-expose-headers': 'ETag, Link, Location, Retry-After, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Used, X-RateLimit-Resource, X-RateLimit-Reset, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval, X-GitHub-Media-Type, X-GitHub-SSO, X-GitHub-Request-Id, Deprecation, Sunset',
2022-02-13T13:21:01.1715821Z     connection: 'close',
2022-02-13T13:21:01.1716238Z     'content-length': '123',

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1 failure not recognized by patterns:

Job	Step	Action
cmake_macos_cpu	curl -o conda.sh https://repo.anaconda.com/miniconda/Miniconda3-latest-MacOSX-x86_64.sh
sh conda.sh -b
source $HOME/miniconda3/bin/activate
conda install -yq conda-build cmake
packaging/build_cmake.sh
	🔁 rerun

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