#   Copyright (c) 2018 PaddlePaddle Authors. 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 unittest
import numpy as np
from op_test import OpTest
from scipy.special import expit


class TestExp(OpTest):
    def setUp(self):
        self.op_type = "exp"
        self.inputs = {
            'X': np.random.uniform(0.1, 1, [11, 17]).astype("float32")
        }
        self.outputs = {'Out': np.exp(self.inputs['X'])}

    def test_check_output(self):
        self.check_output()

    def test_check_grad(self):
        self.check_grad(['X'], 'Out', max_relative_error=0.007)


class TestSigmoid(OpTest):
    def setUp(self):
        self.op_type = "sigmoid"
        self.inputs = {
            'X': np.random.uniform(0.1, 1, [11, 17]).astype("float32")
        }
        self.outputs = {'Out': 1 / (1 + np.exp(-self.inputs['X']))}

    def test_check_output(self):
        self.check_output()

    def test_check_grad(self):
        self.check_grad(['X'], 'Out', max_relative_error=0.008)


class TestLogSigmoid(OpTest):
    def setUp(self):
        self.op_type = "logsigmoid"
        self.inputs = {
            'X': np.random.uniform(-1, 1, [11, 17]).astype("float32")
        }
        self.outputs = {'Out': np.log(1 / (1 + np.exp(-self.inputs['X'])))}

    def test_check_output(self):
        self.check_output()

    def test_check_grad(self):
        self.check_grad(['X'], 'Out', max_relative_error=0.008)


class TestTanh(OpTest):
    def setUp(self):
        self.op_type = "tanh"
        self.inputs = {
            'X': np.random.uniform(0.1, 1, [11, 17]).astype("float32")
        }
        self.outputs = {'Out': np.tanh(self.inputs['X'])}

    def test_check_output(self):
        self.check_output()

    def test_check_grad(self):
        self.check_grad(['X'], 'Out', max_relative_error=0.007)


class TestTanhShrink(OpTest):
    def setUp(self):
        self.op_type = "tanh_shrink"
        self.inputs = {
            'X': np.random.uniform(0.1, 1, [10, 17]).astype("float32")
        }
        self.outputs = {'Out': self.inputs['X'] - np.tanh(self.inputs['X'])}

    def test_check_output(self):
        self.check_output()

    def test_check_grad(self):
        self.check_grad(['X'], 'Out', max_relative_error=0.008)


class TestHardShrink(OpTest):
    def setUp(self):
        self.op_type = "hard_shrink"
        x = np.random.uniform(-1, 1, [4, 4]).astype("float32")
        threshold = 0.5

        self.inputs = {'X': x}
        self.attrs = {'lambda': threshold}

        t = np.copy(x)
        t[(t >= -threshold) & (t <= threshold)] = 0
        self.outputs = {'Out': t}

    def test_check_output(self):
        self.check_output()

    def test_check_grad(self):
        self.check_grad(['X'], 'Out', max_relative_error=0.005)


class TestSoftShrink(OpTest):
    def setUp(self):
        self.op_type = "softshrink"
        lambda_val = 0.1
        self.attrs = {'lambda': lambda_val}
        self.inputs = {
            'X': np.random.uniform(0.25, 10, [4, 4]).astype("float32")
        }
        y = np.copy(self.inputs['X'])
        y = (y < -lambda_val) * (y + lambda_val) + (y > lambda_val) * (
            y - lambda_val)
        self.outputs = {'Out': y}

    def test_check_output(self):
        self.check_output()

    def test_check_grad(self):
        self.check_grad(['X'], 'Out', max_relative_error=0.007)


class TestSqrt(OpTest):
    def setUp(self):
        self.op_type = "sqrt"
        self.inputs = {
            'X': np.random.uniform(0.1, 1, [11, 17]).astype("float32")
        }
        self.outputs = {'Out': np.sqrt(self.inputs['X'])}

    def test_check_output(self):
        self.check_output()

    def test_check_grad(self):
        self.check_grad(['X'], 'Out', max_relative_error=0.007)


class TestAbs(OpTest):
    def setUp(self):
        self.op_type = "abs"
        x = np.random.uniform(-1, 1, [4, 4]).astype("float32")
        # Because we set delta = 0.005 in caculating numeric gradient,
        # if x is too small, such as 0.002, x_neg will be -0.003
        # x_pos will be 0.007, so the numeric gradient is unaccurate.
        # we should avoid this
        x[np.abs(x) < 0.005] = 0.02
        self.inputs = {'X': x}
        self.outputs = {'Out': np.abs(self.inputs['X'])}

    def test_check_output(self):
        self.check_output()

    def test_check_grad(self):
        self.check_grad(['X'], 'Out', max_relative_error=0.007)


class TestCeil(OpTest):
    def setUp(self):
        self.op_type = "ceil"
        x = np.random.uniform(-1, 1, [4, 4]).astype("float32")
        self.inputs = {'X': x}
        self.outputs = {'Out': np.ceil(self.inputs['X'])}

    def test_check_output(self):
        self.check_output()

    def test_check_grad(self):
        self.check_grad(['X'], 'Out', max_relative_error=0.007)


class TestFloor(OpTest):
    def setUp(self):
        self.op_type = "floor"
        x = np.random.uniform(-1, 1, [4, 4]).astype("float32")
        self.inputs = {'X': x}
        self.outputs = {'Out': np.floor(self.inputs['X'])}

    def test_check_output(self):
        self.check_output()

    def test_check_grad(self):
        self.check_grad(['X'], 'Out', max_relative_error=0.007)


class TestRound(OpTest):
    def setUp(self):
        self.op_type = "round"
        x = np.random.uniform(-1, 1, [4, 4]).astype("float32")
        self.inputs = {'X': x}
        self.outputs = {'Out': np.round(self.inputs['X'])}

    def test_check_output(self):
        self.check_output()

    def test_check_grad(self):
        self.check_grad(['X'], 'Out', max_relative_error=0.007)


class TestRelu(OpTest):
    def setUp(self):
        self.op_type = "relu"
        x = np.random.uniform(-1, 1, [11, 17]).astype("float32")
        # The same reason with TestAbs
        x[np.abs(x) < 0.005] = 0.02
        self.inputs = {'X': x}
        self.outputs = {'Out': np.maximum(self.inputs['X'], 0)}

    def test_check_output(self):
        self.check_output()

    def test_check_grad(self):
        self.check_grad(['X'], 'Out', max_relative_error=0.007)


class TestBRelu(OpTest):
    def setUp(self):
        self.op_type = "brelu"
        x = np.random.uniform(-1, 1, [4, 4]).astype("float32")
        t_min = 1.0
        t_max = 4.0
        # The same with TestAbs
        x[np.abs(x - t_min) < 0.005] = t_min + 0.02
        x[np.abs(x - t_max) < 0.005] = t_max + 0.02

        self.inputs = {'X': x}
        self.attrs = {'t_min': t_min, 't_max': t_max}
        t = np.copy(x)
        t[t < t_min] = t_min
        t[t > t_max] = t_max
        self.outputs = {'Out': t}

    def test_check_output(self):
        self.check_output()

    def test_check_grad(self):
        self.check_grad(['X'], 'Out', max_relative_error=0.02)


class TestRelu6(OpTest):
    def setUp(self):
        self.op_type = "relu6"
        x = np.random.uniform(-1, 1, [4, 10]).astype("float32")
        threshold = 6.0
        # The same with TestAbs
        x[np.abs(x) < 0.005] = 0.02
        x[np.abs(x - threshold) < 0.005] = threshold + 0.02

        self.inputs = {'X': x}
        self.attrs = {'threshold': threshold}
        self.outputs = {
            'Out': np.minimum(np.maximum(self.inputs['X'], 0), threshold)
        }

    def test_check_output(self):
        self.check_output()

    def test_check_grad(self):
        self.check_grad(['X'], 'Out', max_relative_error=0.02)


class TestSoftRelu(OpTest):
    def setUp(self):
        self.op_type = "soft_relu"
        x = np.random.uniform(-3, 3, [4, 4]).astype("float32")
        threshold = 2.0
        # The same reason with TestAbs
        x[np.abs(x - threshold) < 0.005] = threshold + 0.02
        x[np.abs(x + threshold) < 0.005] = -threshold + 0.02
        self.inputs = {'X': x}
        self.attrs = {'threshold': threshold}
        t = np.copy(x)
        t[t < -threshold] = -threshold
        t[t > threshold] = threshold
        self.outputs = {'Out': np.log((np.exp(t) + 1))}

    def test_check_output(self):
        self.check_output()

    def test_check_grad(self):
        self.check_grad(['X'], 'Out', max_relative_error=0.02)


class TestELU(OpTest):
    def setUp(self):
        self.op_type = "elu"
        x = np.random.uniform(-3, 3, [4, 4]).astype("float32")
        alpha = 1.
        # Note: unlike other Relu extensions, point 0 on standard ELU function (i.e. alpha = 1)
        # is differentiable, so we can skip modifications like x[np.abs(x) < 0.005] = 0.02 here
        self.inputs = {'X': x}
        self.attrs = {'alpha': alpha}
        self.outputs = {
            'Out': np.maximum(0, x) + np.minimum(0, alpha * (np.exp(x) - 1))
        }

    def test_check_output(self):
        self.check_output()

    def test_check_grad(self):
        self.check_grad(['X'], 'Out', max_relative_error=0.02)


class TestReciprocal(OpTest):
    def setUp(self):
        self.op_type = "reciprocal"
        self.inputs = {'X': np.random.uniform(1, 2, [11, 17]).astype("float32")}
        self.outputs = {'Out': np.reciprocal(self.inputs['X'])}

    def test_check_output(self):
        self.check_output()

    def test_check_grad(self):
        self.check_grad(['X'], 'Out', max_relative_error=0.01)


class TestLog(OpTest):
    def setUp(self):
        self.op_type = "log"
        self.inputs = {
            'X': np.random.uniform(0.1, 1, [11, 17]).astype("float32")
        }
        self.outputs = {'Out': np.log(self.inputs['X'])}

    def test_check_output(self):
        self.check_output()

    def test_check_grad(self):
        self.check_grad(['X'], 'Out', max_relative_error=0.007)


class TestSquare(OpTest):
    def setUp(self):
        self.op_type = "square"
        self.inputs = {
            'X': np.random.uniform(0.1, 1, [11, 17]).astype("float32")
        }
        self.outputs = {'Out': np.square(self.inputs['X'])}

    def test_check_output(self):
        self.check_output()

    def test_check_grad(self):
        self.check_grad(['X'], 'Out', max_relative_error=0.007)


class TestPow(OpTest):
    def setUp(self):
        self.op_type = "pow"
        self.inputs = {'X': np.random.uniform(1, 2, [11, 17]).astype("float32")}
        self.attrs = {'factor': 3.0}
        self.outputs = {'Out': np.power(self.inputs['X'], 3)}

    def test_check_output(self):
        self.check_output()

    def test_check_grad(self):
        self.check_grad(['X'], 'Out', max_relative_error=0.02)


class TestSTanh(OpTest):
    def setUp(self):
        self.op_type = "stanh"
        self.inputs = {
            'X': np.random.uniform(0.1, 1, [11, 17]).astype("float32")
        }
        scale_a = 2.0 / 3.0
        scale_b = 1.7159
        self.attrs = {'scale_a': scale_a, 'scale_b': scale_b}
        self.outputs = {'Out': scale_b * np.tanh(self.inputs['X'] * scale_a)}

    def test_check_output(self):
        self.check_output()

    def test_check_grad(self):
        self.check_grad(['X'], 'Out', max_relative_error=0.007)


class TestSoftplus(OpTest):
    def setUp(self):
        self.op_type = "softplus"
        self.inputs = {
            'X': np.random.uniform(-1, 1, [11, 17]).astype("float64")
        }
        self.outputs = {'Out': np.log(1 + np.exp(self.inputs['X']))}

    def test_check_output(self):
        self.check_output()

    def test_check_grad(self):
        self.check_grad(['X'], 'Out', max_relative_error=0.007)


class TestSoftsign(OpTest):
    def setUp(self):
        self.op_type = "softsign"
        self.inputs = {
            'X': np.random.uniform(-1, 1, [11, 17]).astype("float32")
        }
        self.outputs = {
            'Out': np.divide(self.inputs['X'], 1 + np.abs(self.inputs['X']))
        }

    def test_check_output(self):
        self.check_output()

    def test_check_grad(self):
        self.check_grad(['X'], 'Out', max_relative_error=0.007)


class TestThresholdedRelu(OpTest):
    def setUp(self):
        self.op_type = "thresholded_relu"
        threshold = 0.25
        self.relative_error = 0.005
        X = np.random.uniform(-1, 1, [11, 17]).astype("float32")

        # Same reason as TestAbs
        X[np.abs(X - threshold) < self.relative_error] = threshold + 0.2

        self.inputs = {'X': X}
        self.attrs = {'threshold': threshold}
        self.outputs = {'Out': (X > threshold) * X}

    def test_check_output(self):
        self.check_output()

    def test_check_grad(self):
        self.check_grad(['X'], 'Out', max_relative_error=self.relative_error)


class TestHardSigmoid(OpTest):
    def setUp(self):
        self.op_type = "hard_sigmoid"
        self.relative_error = 0.002

        X = np.random.uniform(-5, 5, [2, 2]).astype("float32")
        slope = 0.2
        offset = 0.5
        lower_threshold = -offset / slope
        upper_threshold = (1 - offset) / slope

        self.inputs = {'X': X}
        # Same reason as TestAbs
        X[np.abs(X - lower_threshold) < self.relative_error] = \
            lower_threshold + 0.2
        X[np.abs(X - upper_threshold) < self.relative_error] = \
            upper_threshold - 0.2

        temp = X * slope + offset
        self.outputs = {'Out': np.maximum(0.0, np.minimum(1.0, temp))}

    def test_check_output(self):
        self.check_output()

    def test_check_grad(self):
        self.check_grad(['X'], 'Out', max_relative_error=0.002)


class TestSwish(OpTest):
    def setUp(self):
        self.op_type = "swish"
        X = np.random.uniform(0.1, 1, [11, 17]).astype("float32")
        self.inputs = {'X': X}
        self.attrs = {'beta': 2.3}
        self.outputs = {'Out': X * expit(self.attrs['beta'] * X)}

    def test_check_output(self):
        self.check_output()

    def test_check_grad(self):
        self.check_grad(['X'], 'Out', max_relative_error=0.008)


if __name__ == "__main__":
    unittest.main()
