build: Install tensorflow-macos on Apple silicon Macs

[matthewfeickert]

Description

• Resolves Cannot resolve dependencies in "all" setup extra #2111
• Closes docs: Add FAQ on backend support on Apple silicon Macs  #2118

Use hatchling's environment markers system to use platform information to determine when the installing machine is an Apple silicon Mac and install tensorflow-macos instead of tensorflow in this situation. This works because of the following:

• x86-64 Linux machine:

>>> import platform
>>> platform.machine()
'x86_64'
>>> platform.system()
'Linux'

• x86-64 Apple machine:

>>> import platform
>>> platform.machine()
'x86_64'
>>> platform.system()
'Darwin'

• AArch64 machine:

>>> import platform
>>> platform.machine()
'aarch64'
>>> platform.system()
'Linux'

• Apple silicon machine:

>>> import platform
>>> platform.machine()
'arm64'
>>> platform.system()
'Darwin'

This is a nice workaround for tensorflow/tensorflow#57185.

The check for an Apple silicon Mac is purposefully over specified with both platform_machine and platform_system as I do not know for certain that arm64 will be reserved for Apple silicon machines forever.

Checklist Before Requesting Reviewer

• Tests are passing
• "WIP" removed from the title of the pull request
• Selected an Assignee for the PR to be responsible for the log summary

Before Merging

For the PR Assignees:

• Summarize commit messages into a comprehensive review of the PR

* Use hatchling's environment markers system to use platform information
  to determine when the installing machine is an Apple silicon Mac
  and install tensorflow-macos instead of tensorflow in this situation.
   - c.f. https://hatch.pypa.io/latest/config/dependency/#environment-markers
* This works because of the following:
   - x86-64 Linux machine:
     >>> import platform
     >>> platform.machine()
     'x86_64'
     >>> platform.system()
     'Linux'
   - x86-64 Apple machine:
     >>> import platform
     >>> platform.machine()
     'x86_64'
     >>> platform.system()
     'Darwin'
   - AArch64 machine:
     >>> import platform
     >>> platform.machine()
     'aarch64'
     >>> platform.system()
     'Linux'
   - Apple silicon machine:
     >>> import platform
     >>> platform.machine()
     'arm64'
     >>> platform.system()
     'Darwin'

[matthewfeickert]

Purposefully over specified with both platform_machine and platform_system as I do not know for certain that arm64 will be reserved for Apple silicon machines forever.

[codecov]

Codecov Report

Base: 98.30% // Head: 98.30% // No change to project coverage 👍

Coverage data is based on head (b970ed4) compared to base (46ce316).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2119   +/-   ##
=======================================
  Coverage   98.30%   98.30%           
=======================================
  Files          69       69           
  Lines        4531     4531           
  Branches      645      645           
=======================================
  Hits         4454     4454           
  Misses         45       45           
  Partials       32       32           

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contrib	97.88% <ø> (ø)
doctest	61.15% <ø> (ø)
unittests-3.10	96.31% <ø> (ø)
unittests-3.8	96.33% <ø> (ø)
unittests-3.9	96.35% <ø> (ø)

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[matthewfeickert]

@alexander-held @lukasheinrich as you both have Apple silicon machines can you check that this PR works? Just

$ python -m pip install --upgrade -e '.[backends]'

should be enough.

[matthewfeickert]

I was able to get this tested on a M2 machine and it works there, so as @kratsg has signed off I'm going to merge this. 👍