By setting `jax.config.update('jax_cpu_enable_async_dispatch', False)`, one could opt out of the change and recover the old behavior.
PiperOrigin-RevId: 633264117
On GPU, the Threefry PRNG implementation no longer lowers to a kernel call by default. This choice can improve runtime memory usage at a compile-time cost. Prior behavior, which produces a kernel call, can be recovered with:
`jax.config.update('jax_threefry_gpu_kernel_lowering', True)`
PiperOrigin-RevId: 629763763
Prior to this change the behavior in eager and under jax.jit was inconsistent
>>> (lambda *args: jax.debug.callback(print, *args))([42])
[42]
>>> jax.jit(lambda *args: jax.debug.callback(print, *args))([42])
[array(42, dtype=int32)]
It was also inconsistent with other callback APIs, which cast the arguments
to jax.Arrays.
Closes#20627.
PiperOrigin-RevId: 626461904
Before the change, on CPU backend we always run computations inline unless there are multiple CPU devices with potential collectives. Now, we will use `HloCostAnalysis` to estimate the cost of the computation and do async dispatch if it is expensive.
Add a JAX flag for users to opt-out by adding `jax.config.update('jax_cpu_enable_async_dispatch', False)` in their programs.
PiperOrigin-RevId: 625064815
Invalid static_argnames/static_argnums have been resulting in a warning since JAX v0.3.17, released in June 2022. After this change, they will result in an error.
PiperOrigin-RevId: 624270701
The method has been emitting an DeprecationWarning since JAX v0.4.21, released December 2023. Existing uses can be replaced with `arr.devices()` or `arr.sharding`, depending on the context.
PiperOrigin-RevId: 623015500
The motivation for this change is two-fold
* JAX APIs should use jax.Arrays.
* Using jax.Arrays potentially allows keeping the data on device, instead
of always copying it to the host. Note that the version here still always
copies to the host.
If this change breaks you, you can recover the old behavior by changing
jax.pure_callback(
f,
result_shape_dtypes,
*args,
**kwargs,
)
to
jax.pure_callback(
lambda *args: f(*jax.tree.map(np.asarray, args)),
result_shape_dtypes,
*args,
**kwargs,
)
so that the callback function is called with NumPy arrays as before.
I will update the "External callbacks" tutorial in a follow up.
PiperOrigin-RevId: 622457378
The host_callbacks APIs are deprecated and will be removed. In order to
help the transition to the new APIs, we add a flag (`JAX_HOST_CALLBACK_LEGACY`)
that when set to `False` will use `io_callback` (and `pure_callback` and
`jax.debug.callback`) to implement the host_callback APIs.
See issue #20385 for more details.
We change the tests to accomodate slightly different results when using
the new callbacks. The tests that use `tap_with_device` and `call_with_device`
are disabled when using the new callbacks.
The old lowering pass via Triton Python APIs has been removed and the
JAX_TRITON_COMPILE_VIA_XLA environment variable no longer has any effect.
PiperOrigin-RevId: 621857046
