# Copyright (c) 2017 Sony Corporation.  All Rights Reserved. 
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License. 
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
# See the License for the specific language governing permissions and
# limitations under the License. 

import pytest
import numpy as np
import nnabla.functions as F
from nbla_test_utils import list_context

ctxs = list_context('Pow2')


@pytest.mark.parametrize("ctx, func_name", ctxs)
@pytest.mark.parametrize("seed", [313])
def test_pow2_double_backward(seed, ctx, func_name):
    from nbla_test_utils import backward_function_tester
    rng = np.random. RandomState(seed)
    inputs = [(rng.randint(5, size=(2, 3)).astype(np.float32) + 1.0) * 0.2,
              rng.randn(2, 3).astype(np.float32), ]
    backward_function_tester(rng, F.pow2, None,
                             inputs=inputs,
                             func_args=[], func_kwargs={},
                             atol_b=5e-2,
                             atol_accum=5e-2,
                             dstep=1e-3,
                             ctx=ctx, func_name=None,
                             disable_half_test=False)
