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# BSD 3-Clause License; see https://github.com/scikit-hep/awkward/blob/main/LICENSE
from __future__ import annotations
import numpy as np
import pytest
import awkward as ak
jax = pytest.importorskip("jax")
jax.config.update("jax_platform_name", "cpu")
jax.config.update("jax_enable_x64", True)
ak.jax.register_and_check()
class GradBehavior(ak.Array): ...
def test():
def square_fifth_entry(x):
return x[4] ** 2
primal = ak.Array(np.arange(10, dtype=np.float64), backend="jax")
tangent = ak.Array(np.arange(10, dtype=np.float64), backend="jax")
behavior = {"grad": GradBehavior}
primal_grad = ak.with_parameter(primal, "__array__", "grad", behavior=behavior)
tangent_grad = ak.with_parameter(tangent, "__array__", "grad", behavior=behavior)
value_jvp_grad, jvp_grad_grad = jax.jvp(
square_fifth_entry, (primal_grad,), (tangent_grad,)
)
assert value_jvp_grad == pytest.approx(16.0)
assert jvp_grad_grad == pytest.approx(32.0)
def test_jvp_nested_list():
# with jax.checking_leaks():
array = ak.Array(np.array([[1.0, 2.0, 3.0, 4.0, 5.0]]), backend="jax")
tangent = ak.Array(np.array([[0.0, 0.0, 0.0, 0.0, 1.0]]), backend="jax")
def func(x):
return x[::-1] ** 2
# TODO: enable leak checking
# with jax.checking_leaks():
value_jvp, jvp_grad = jax.jvp(func, (array,), (tangent,))
assert value_jvp.to_list() == [[1.0, 4.0, 9.0, 16.0, 25.0]]
assert jvp_grad.to_list() == [[0.0, 0.0, 0.0, 0.0, 10.0]]
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