regression test failure on macos intel runs

[chenrui333]

👋 trying to build the latest release, but run into some regression test issue. The error log is as below:

regression test log

  ==> /usr/bin/clang++ test.cpp -std=c++17 -I/usr/local/Cellar/mlx/0.21.1/include -L/usr/local/Cellar/mlx/0.21.1/lib -lmlx -o test
  ==> ./test
  ==> python3.13 test.py
  Traceback (most recent call last):
    File "/private/tmp/mlx-test-20241207-14040-i4lr7y/test.py", line 3, in <module>
      assert mx.cos(x) == 1.0
             ^^^^^^^^^^^^^^^^
  AssertionError

full build log, https://github.com/Homebrew/homebrew-core/actions/runs/12207413864/job/34063910203?pr=161270
relates to Homebrew/homebrew-core#200351

[awni]

This looks like a testing issue probably exposed by a recent switch to using accelerate for the intel back-end as well:

>>> mx.cos(0.0, stream=mx.cpu).item()
0.9999999403953552

In general I would us mx.allclose rather than test exact match when dealing with floating point numbers. So change your test to:

assert mx.allclose(mx.cos(x), mx.array(1.0))