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This can be used to enable debug logging for specific files
(e.g. `JAX_DEBUG_LOG_MODULES="jax._src.xla_bridge,jax._src.dispatch"`)
or all jax (`JAX_DEBUG_LOG_MODULES="jax"`).
Example output:
```
$ JAX_DEBUG_LOG_MODULES=jax python3 -c "import jax; jax.numpy.add(1,1)"
DEBUG:2023-06-07 00:27:57,399:jax._src.xla_bridge:352: No jax_plugins namespace packages available
DEBUG:2023-06-07 00:27:57,488:jax._src.path:29: etils.epath found. Using etils.epath for file I/O.
DEBUG:2023-06-07 00:27:57,663:jax._src.dispatch:272: Finished tracing + transforming fn for pjit in 0.0005719661712646484 sec
DEBUG:2023-06-07 00:27:57,664:jax._src.xla_bridge:590: Initializing backend 'tpu'
DEBUG:2023-06-07 00:28:00,502:jax._src.xla_bridge:602: Backend 'tpu' initialized
DEBUG:2023-06-07 00:28:00,502:jax._src.xla_bridge:590: Initializing backend 'cpu'
DEBUG:2023-06-07 00:28:00,542:jax._src.xla_bridge:602: Backend 'cpu' initialized
DEBUG:2023-06-07 00:28:00,544:jax._src.interpreters.pxla:1890: Compiling fn for with global shapes and types [ShapedArray(int32[], weak_type=True), ShapedArray(int32[], weak_type=True)]. Argument mapping: (GSPMDSharding({replicated}), GSPMDSharding({replicated})).
DEBUG:2023-06-07 00:28:00,547:jax._src.dispatch:272: Finished jaxpr to MLIR module conversion jit(fn) in 0.0023522377014160156 sec
DEBUG:2023-06-07 00:28:00,547:jax._src.xla_bridge:140: get_compile_options: num_replicas=1 num_partitions=1 device_assignment=[[TpuDevice(id=0, process_index=0, coords=(0,0,0), core_on_chip=0)]]
DEBUG:2023-06-07 00:28:00,571:jax._src.dispatch:272: Finished XLA compilation of jit(fn) in 0.023587703704833984 sec
```