# Copyright 2019 Huawei Technologies Co., Ltd
#
# 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.

from akg.utils import kernel_exec as utils
import numpy as np
from test_op import logsoftmax_ad
from gen_random import random_gaussian


def logsoftmax_ad_run(shape, dtype, axis, kernel_name, attrs=None):
    if axis != -1:
        raise("Only support comptation on last axis now")

    if 'tuning' in attrs.keys():
        t = attrs.get("tuning", False)
        kernel_name = attrs.get("kernel_name", False)
        mod = utils.op_build_test(logsoftmax_ad.logsoftmax_ad, [shape], [dtype], [axis],
                                  kernel_name=kernel_name, attrs=attrs, tuning=t)
        if t:
            expect, input, output = gen_data(dtype, shape)
            return mod, expect, (input, output)
        else:
            return mod
    else:
        mod = logsoftmax_ad.logsoftmax_ad(shape, dtype, axis, kernel_name, attrs)
        expect, input, output = gen_data(dtype, shape)
        output = utils.mod_launch(mod, (input, output), expect=expect)
        return input, output, expect, True


def gen_data(dtype, shape):
    input = random_gaussian(shape, miu=1, sigma=0.1).astype(dtype)
    sub = input - np.max(input, axis=-1, keepdims=True)
    e_x = np.exp(sub)
    logexpsum = np.log(np.sum(e_x, axis=-1, keepdims=True))
    expect = sub - logexpsum
    output = np.full(shape, np.nan, dtype)
    return expect, input, output
