[GitHub] [incubator-mxnet] aaronmarkham opened a new pull request #15561: Julia path patch

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aaronmarkham opened a new pull request #15561: Julia path patch
URL: https://github.com/apache/incubator-mxnet/pull/15561
 
 
   ## Description ##
   Another followup PR to fix the Julia site build and unblock website publishing...
   Since the website builds so many versions, it does so in their own folders inside `/mxnet/docs/build_version_doc/apache-mxnet/...` and this makes it difficult for Julia to find when it's expecting the binaries in `/work/mxnet/lib`. After digging through the Julia source and testing a bunch of things I found that `LD_LIBRARY_PATH` doesn't seem to do anything, but `MXNET_HOME` is what Julia is looking for. It then manually appends `lib`. 
   Unfortunately, according to the [MXNet environment variables](https://mxnet.incubator.apache.org/versions/master/faq/env_var.html) page, this same env var is used elsewhere to store models.
   
   Unblocking website publishing is my primary goal, not dealing with conflicting environment variables, so I'm patching this for now, but I think the Julia package should updated to use `MXNET_LIBRARY_PATH` or `LD_LIBRARY_PATH` instead. 
   
   My test run used a test CI pipeline that points to my fork:
   http://jenkins.mxnet-ci.amazon-ml.com/job/test-website-build/
   
   The "successful" run was here. It fails because there's no place to publish, which is fine. Everything else worked: http://jenkins.mxnet-ci.amazon-ml.com/job/test-website-build/3/console
   We might want to keep this test pipeline around... it took me awhile to remember how to create one for testing, and I definitely should have done this thorough test in the first place.
   
   It was able to find Julia, and it used the locally compiled binary based off of the target branch: this one.
   
   I'm hoping this is the last surprise that the CI environment is going to give me for getting Julia to publish.
   
   Previous PRs for the Julia docs publishing:
   https://github.com/apache/incubator-mxnet/pull/15554
   https://github.com/apache/incubator-mxnet/pull/15523
   https://github.com/apache/incubator-mxnet/pull/15454

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