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# BSD 3-Clause License; see https://github.com/scikit-hep/awkward/blob/main/LICENSE
from __future__ import annotations
import cupy as cp
import numpy as np
import pytest
import awkward as ak
from awkward._nplikes.cupy import Cupy
from awkward._nplikes.numpy import Numpy
try:
ak.numba.register_and_check()
except ImportError:
pytest.skip(reason="too old Numba version", allow_module_level=True)
def test_cupy_interop():
cupy = Cupy.instance()
numpy = Numpy.instance()
cupy_index_arr = ak.index.Index64(cp.arange(10))
assert cupy_index_arr.nplike is cupy
np_index_arr = ak.index.Index64(np.arange(10))
assert np_index_arr.nplike is numpy
cupy_as_numpy = cupy_index_arr.to_nplike(numpy)
assert isinstance(cupy_as_numpy.data, np.ndarray) and not isinstance(
cupy_as_numpy.data, cp.ndarray
)
numpy_as_cupy = np_index_arr.to_nplike(cupy)
assert isinstance(numpy_as_cupy.data, cp.ndarray)
# GPU->CPU
assert cupy_as_numpy.data.tolist() == np.asarray(np_index_arr).tolist()
# CPU->CPU
assert numpy_as_cupy.data.tolist() == np.asarray(np_index_arr).tolist()
numpy_round_trip = numpy_as_cupy.to_nplike(numpy)
assert isinstance(numpy_round_trip.data, np.ndarray)
# CPU->GPU->CPU
assert numpy_round_trip.data.tolist() == np.asarray(np_index_arr).tolist()
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