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# Copyright (c) 2025, Nick Smith
#
# Distributed under the 3-clause BSD license, see accompanying file LICENSE
# or https://github.com/scikit-hep/vector for details.
from __future__ import annotations
import numpy as np
import pytest
import vector
try:
pytree = vector.register_pytree()
except ImportError:
pytest.skip("optree is not installed", allow_module_level=True)
def test_pytree_roundtrip_VectorObject2D():
vec = vector.obj(x=1, y=2)
leaves, treedef = pytree.flatten(vec)
assert leaves == [1, 2]
vec2 = pytree.unflatten(treedef, leaves)
assert vec == vec2
vec = vector.obj(rho=1, phi=2)
leaves, treedef = pytree.flatten(vec)
assert leaves == [1, 2]
vec2 = pytree.unflatten(treedef, leaves)
assert vec == vec2
assert type(vec.azimuthal) is type(vec2.azimuthal)
def test_pytree_roundtrip_MomentumObject2D():
vec = vector.obj(px=1, py=2)
leaves, treedef = pytree.flatten(vec)
assert leaves == [1, 2]
vec2 = pytree.unflatten(treedef, leaves)
assert vec == vec2
vec = vector.obj(pt=1, phi=2)
leaves, treedef = pytree.flatten(vec)
assert leaves == [1, 2]
vec2 = pytree.unflatten(treedef, leaves)
assert vec == vec2
assert type(vec.azimuthal) is type(vec2.azimuthal)
def test_pytree_roundtrip_VectorObject3D():
vec = vector.obj(x=1, y=2, z=3)
leaves, treedef = pytree.flatten(vec)
assert leaves == [1, 2, 3]
vec2 = pytree.unflatten(treedef, leaves)
assert vec == vec2
vec = vector.obj(rho=1, phi=2, z=3)
leaves, treedef = pytree.flatten(vec)
assert leaves == [1, 2, 3]
vec2 = pytree.unflatten(treedef, leaves)
assert vec == vec2
assert type(vec.azimuthal) is type(vec2.azimuthal)
assert type(vec.longitudinal) is type(vec2.longitudinal)
vec = vector.obj(x=1, y=2, theta=3)
leaves, treedef = pytree.flatten(vec)
assert leaves == [1, 2, 3]
vec2 = pytree.unflatten(treedef, leaves)
assert vec == vec2
assert type(vec.azimuthal) is type(vec2.azimuthal)
assert type(vec.longitudinal) is type(vec2.longitudinal)
def test_pytree_roundtrip_MomentumObject3D():
vec = vector.obj(px=1, py=2, pz=3)
leaves, treedef = pytree.flatten(vec)
assert leaves == [1, 2, 3]
vec2 = pytree.unflatten(treedef, leaves)
assert vec == vec2
vec = vector.obj(pt=1, phi=2, pz=3)
leaves, treedef = pytree.flatten(vec)
assert leaves == [1, 2, 3]
vec2 = pytree.unflatten(treedef, leaves)
assert vec == vec2
assert type(vec.azimuthal) is type(vec2.azimuthal)
assert type(vec.longitudinal) is type(vec2.longitudinal)
vec = vector.obj(px=1, py=2, theta=3)
leaves, treedef = pytree.flatten(vec)
assert leaves == [1, 2, 3]
vec2 = pytree.unflatten(treedef, leaves)
assert vec == vec2
assert type(vec.azimuthal) is type(vec2.azimuthal)
assert type(vec.longitudinal) is type(vec2.longitudinal)
def test_pytree_roundtrip_VectorObject4D():
vec = vector.obj(x=1, y=2, z=3, t=4)
leaves, treedef = pytree.flatten(vec)
assert leaves == [1, 2, 3, 4]
vec2 = pytree.unflatten(treedef, leaves)
assert vec == vec2
vec = vector.obj(rho=1, phi=2, z=3, t=4)
leaves, treedef = pytree.flatten(vec)
assert leaves == [1, 2, 3, 4]
vec2 = pytree.unflatten(treedef, leaves)
assert vec == vec2
assert type(vec.azimuthal) is type(vec2.azimuthal)
assert type(vec.longitudinal) is type(vec2.longitudinal)
assert type(vec.temporal) is type(vec2.temporal)
vec = vector.obj(x=1, y=2, theta=3, t=4)
leaves, treedef = pytree.flatten(vec)
assert leaves == [1, 2, 3, 4]
vec2 = pytree.unflatten(treedef, leaves)
assert vec == vec2
assert type(vec.azimuthal) is type(vec2.azimuthal)
assert type(vec.longitudinal) is type(vec2.longitudinal)
assert type(vec.temporal) is type(vec2.temporal)
vec = vector.obj(pt=1, phi=2, eta=3, mass=4)
leaves, treedef = pytree.flatten(vec)
assert leaves == [1, 2, 3, 4]
vec2 = pytree.unflatten(treedef, leaves)
assert vec == vec2
assert type(vec.azimuthal) is type(vec2.azimuthal)
assert type(vec.longitudinal) is type(vec2.longitudinal)
assert type(vec.temporal) is type(vec2.temporal)
def test_pytree_roundtrip_SoA():
vec = vector.obj(x=1, y=1) * np.ones(10)
flat, unravel = pytree.ravel(vec)
assert flat.shape == (20,)
assert (unravel(flat) == vec).all()
vec = vector.obj(pt=1, eta=1, phi=1, mass=1) * np.ones(10)
flat, unravel = pytree.ravel(vec)
assert flat.shape == (40,)
assert (unravel(flat) == vec).all()
def test_pytree_roundtrip_AoS():
vec = vector.array(
{
"x": np.ones(10),
"y": np.ones(10),
}
)
flat, unravel = pytree.ravel(vec)
assert flat.shape == (20,)
assert flat.dtype == np.float64
assert (unravel(flat) == vec).all()
vec = vector.array(
{
"pt": np.ones(10),
"eta": np.ones(10),
"phi": np.ones(10),
"mass": np.ones(10),
}
)
flat, unravel = pytree.ravel(vec)
assert flat.shape == (40,)
assert flat.dtype == np.float64
assert (unravel(flat) == vec).all()
def test_run_once():
# Calling register_pytree multiple times returns the same object
pytree2 = vector.register_pytree()
assert pytree is pytree2
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