ak.backend
----------

.. py:module: ak.backend

Defined in `awkward.operations.ak_backend <https://github.com/scikit-hep/awkward/blob/36da52cfa8846355c390beb6555eac1d31c27c26/src/awkward/operations/ak_backend.py>`__ on `line 12 <https://github.com/scikit-hep/awkward/blob/36da52cfa8846355c390beb6555eac1d31c27c26/src/awkward/operations/ak_backend.py#L12>`__.

.. py:function:: ak.backend(*arrays)


    :param arrays: Array-like data (anything :py:obj:`ak.to_layout` recognizes).

Returns the name of the backend used by ``arrays``. This name may be

* ``"cpu"`` for arrays backed by NumPy;
* ``"cuda"`` for arrays backed by CuPy;
* ``"jax"`` for arrays backed by JAX;
* ``"typetracer"`` for arrays without any data;
* None if the objects are not Awkward, NumPy, JAX, CuPy, or typetracer arrays (e.g.
  Python numbers, booleans, strings).

If there are multiple, compatible backends (e.g. NumPy & typetracer) amongst the given arrays, the
coercible backend is returned.

See :py:obj:`ak.to_backend`.