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Tip revision: c58e6b7070cbbd6cd912ee398292d1d3d10995e2 authored by Majid Dadashi on 02 August 2023, 20:28:07 UTC
Allow filtering the JAX test harnesses based on data types
Allow filtering the JAX test harnesses based on data types
Tip revision: c58e6b7
rank_promotion_warning.rst
Rank promotion warning
======================
`NumPy broadcasting rules
<https://docs.scipy.org/doc/numpy/user/basics.broadcasting.html#general-broadcasting-rules>`_
allow the automatic promotion of arguments from one rank (number of array axes)
to another. This behavior can be convenient when intended but can also lead to
surprising bugs where a silent rank promotion masks an underlying shape error.
Here's an example of rank promotion:
>>> import numpy as np
>>> x = np.arange(12).reshape(4, 3)
>>> y = np.array([0, 1, 0])
>>> x + y
array([[ 0, 2, 2],
[ 3, 5, 5],
[ 6, 8, 8],
[ 9, 11, 11]])
To avoid potential surprises, :code:`jax.numpy` is configurable so that
expressions requiring rank promotion can lead to a warning, error, or can be
allowed just like regular NumPy. The configuration option is named
:code:`jax_numpy_rank_promotion` and it can take on string values
:code:`allow`, :code:`warn`, and :code:`raise`. The default setting is
:code:`allow`, which allows rank promotion without warning or error.
The :code:`raise` setting raises an error on rank promotion, and :code:`warn`
raises a warning on the first occurrence of rank promotion.
Rank promotion can be enabled or disabled locally with the :func:`jax.numpy_rank_promotion`
context manager:
.. code-block:: python
with jax.numpy_rank_promotion("warn"):
z = x + y
This configuration can also be set globally in several ways.
One is by using :code:`jax.config` in your code:
.. code-block:: python
from jax import config
config.update("jax_numpy_rank_promotion", "warn")
You can also set the option using the environment variable
:code:`JAX_NUMPY_RANK_PROMOTION`, for example as
:code:`JAX_NUMPY_RANK_PROMOTION='warn'`. Finally, when using :code:`absl-py`
the option can be set with a command-line flag.