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# regarding copyright ownership.  The ASF licenses this file
# to you 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 numpy as np
import scipy
from scipy import special
import tvm
from tvm import te
import topi
import topi.testing
from topi import util
from common import get_all_backend


def test_util():
    x = tvm.tir.const(100, "int32")
    assert util.get_const_int(x) == 100
    assert util.get_const_tuple((x, x)) == (100, 100)


def test_ewise():
    def test_apply(
        func,
        name,
        f_numpy,
        low,
        high,
        shape=(20, 3),
        dtype="float32",
        check_round=False,
        skip_name_check=False,
    ):
        m = te.var("m")
        l = te.var("l")
        A = te.placeholder((m, l), dtype=dtype, name="A")

        B = func(A)
        assert tuple(B.shape) == tuple(A.shape)
        if not skip_name_check:
            assert B.op.body[0].name == name
        a_np = np.random.uniform(low=low, high=high, size=shape).astype(A.dtype) * 10
        # avoid round check too close to boundary
        if check_round:
            a_np += ((np.abs(np.fmod(a_np, 1)) - 0.5) < 1e-6) * 1e-5
        b_np = f_numpy(a_np)

        def check_device(device):
            ctx = tvm.context(device, 0)
            if not ctx.exist:
                print("Skip because %s is not enabled" % device)
                return
            print("Running on target: %s" % device)
            with tvm.target.create(device):
                s = topi.testing.get_injective_schedule(device)(B)
            foo = tvm.build(s, [A, B], device, name=name)
            a = tvm.nd.array(a_np, ctx)
            b = tvm.nd.array(np.zeros_like(b_np), ctx)
            foo(a, b)
            tvm.testing.assert_allclose(b.asnumpy(), b_np, rtol=1e-5, atol=1e-5)

        for target in get_all_backend():
            check_device(target)

    def test_isnan(
        low,
        high,
        shape=(20, 3),
        dtype="float32",
        check_round=False,
        skip_name_check=False,
    ):
        m = te.var("m")
        l = te.var("l")
        A = te.placeholder((m, l), dtype=dtype, name="A")

        B = topi.isnan(A)
        assert tuple(B.shape) == tuple(A.shape)
        if not skip_name_check:
            assert B.op.body[0].name == "isnan"
        a_np = np.random.uniform(low=low, high=high, size=shape).astype(A.dtype) * 10
        a_np.ravel()[np.random.choice(a_np.size, int(a_np.size * 0.5), replace=False)] = np.nan
        # avoid round check too close to boundary
        if check_round:
            a_np += ((np.abs(np.fmod(a_np, 1)) - 0.5) < 1e-6) * 1e-5
        b_np = np.isnan(a_np)

        def check_device(device):
            ctx = tvm.context(device, 0)
            if not ctx.exist:
                print("Skip because %s is not enabled" % device)
                return
            print("Running on target: %s" % device)
            with tvm.target.create(device):
                s = topi.testing.get_injective_schedule(device)(B)
            foo = tvm.build(s, [A, B], device, name="isnan")
            a = tvm.nd.array(a_np, ctx)
            b = tvm.nd.array(np.zeros_like(b_np), ctx)
            foo(a, b)
            tvm.testing.assert_allclose(b.asnumpy(), b_np, rtol=1e-5, atol=1e-5)

        for target in get_all_backend():
            check_device(target)

    def test_infiniteness_ops(topi_op, ref_op, name):
        for dtype in ['float32', 'float64', 'int32', 'int16']:
            m = te.var("m")
            l = te.var("l")
            A = te.placeholder((m, l), dtype=dtype, name="A")
            B = topi_op(A)
            assert tuple(B.shape) == tuple(A.shape)

            a_np = np.random.uniform(size=(8, 8)).astype(A.dtype) * 10
            if dtype.startswith('float'):
                a_np.ravel()[np.random.choice(a_np.size, int(a_np.size * 0.5), replace=False)] = np.infty
                a_np.ravel()[np.random.choice(a_np.size, int(a_np.size * 0.5), replace=False)] = np.nan
            b_np = ref_op(a_np)

            def check_device(device):
                ctx = tvm.context(device, 0)
                if not ctx.exist:
                    print("Skip because %s is not enabled" % device)
                    return
                with tvm.target.create(device):
                    s = topi.testing.get_injective_schedule(device)(B)
                foo = tvm.build(s, [A, B], device, name=name)
                a = tvm.nd.array(a_np, ctx)
                b = tvm.nd.array(np.zeros_like(b_np), ctx)
                foo(a, b)
                tvm.testing.assert_allclose(b.asnumpy(), b_np, rtol=1e-5, atol=1e-5)

            for target in get_all_backend():
                check_device(target)

    test_apply(topi.floor, "floor", np.floor, -100, 100)
    test_apply(topi.ceil, "ceil", np.ceil, -100, 100)
    test_apply(topi.sign, "sign", np.sign, -100, 100, skip_name_check=True)
    test_apply(topi.trunc, "trunc", np.trunc, -100, 100)
    test_apply(topi.abs, "fabs", np.abs, -100, 100)
    test_apply(topi.round, "round", np.round, -100, 100, check_round=True)
    test_apply(topi.exp, "exp", np.exp, -1, 1)
    test_apply(topi.tanh, "tanh", np.tanh, -10, 10, shape=(128, 128))
    test_apply(topi.tanh, "tanh", np.tanh, -10, 10, shape=(128, 128), dtype="float64")
    test_apply(topi.sigmoid, "sigmoid", lambda x: 1 / (1 + np.exp(-x)), -1, 1)
    test_apply(topi.log, "log", np.log, 0, 100)
    test_apply(topi.sqrt, "sqrt", np.sqrt, 0, 100)
    test_apply(topi.rsqrt, "rsqrt", lambda x: np.ones_like(x) / np.sqrt(x), 0, 100, skip_name_check=True)
    test_apply(topi.cos, "cos", np.cos, -2.0*np.pi, 2.0*np.pi)
    test_apply(topi.tan, "tan", np.tan, -2.0*np.pi, 2.0*np.pi, dtype='float32')
    test_apply(topi.tan, "tan", np.tan, -2.0*np.pi, 2.0*np.pi, dtype='float64')
    test_apply(topi.sin, "sin", np.sin, -2.0*np.pi, 2.0*np.pi)
    test_apply(topi.erf, "erf", scipy.special.erf, -.1, .1, dtype="float32")
    test_isnan(-100, 100)
    test_infiniteness_ops(topi.isfinite, np.isfinite, 'isifinite')
    test_infiniteness_ops(topi.isinf, np.isinf, 'isinf')


def test_cast():
    def verify(from_dtype, to_dtype, low=-100, high=100):
        shape = (5, 4)
        A = te.placeholder(shape, dtype=from_dtype, name="A")
        B = topi.cast(A, to_dtype)

        if from_dtype == "bool":
            a_np = np.random.choice([True, False], size=shape)
        else:
            a_np = np.random.uniform(low, high, size=shape).astype(from_dtype)
        if to_dtype == "bool":
            a_np = a_np - a_np[2, 3]
        b_np = a_np.astype(to_dtype)

        for device in get_all_backend():
            ctx = tvm.context(device, 0)
            if not ctx.exist:
                print("Skip because %s is not enabled" % device)
                continue
            print("Running on target: %s" % device)
            with tvm.target.create(device):
                s = topi.testing.get_injective_schedule(device)(B)
            foo = tvm.build(s, [A, B], device)
            a = tvm.nd.array(a_np, ctx)
            b = tvm.nd.empty(shape=shape, dtype=to_dtype, ctx=ctx)
            foo(a, b)
            tvm.testing.assert_allclose(b.asnumpy(), b_np)

    verify("int32", "float32")
    verify("int32", "float64")
    verify("int32", "bool")
    verify("float32", "int32")
    verify("float32", "float64")
    verify("float32", "bool")
    verify("bool", "float32")
    verify("bool", "int32")


def test_fastmath():
    def test_apply(
        func,
        name,
        f_numpy,
        low,
        high,
        step,
        dtype="float32"
    ):
        a_np = np.arange(low, high, step).astype(dtype)
        b_np = f_numpy(a_np)
        A = te.placeholder(a_np.shape, dtype=dtype, name="A")
        B = func(A)
        assert tuple(B.shape) == tuple(A.shape)

        def check_device(device):
            ctx = tvm.context(device, 0)
            if not ctx.exist:
                print("Skip because %s is not enabled" % device)
                return
            with tvm.target.create(device):
                s = topi.generic.schedule_injective(B)
            func = tvm.build(s, [A, B], device, name=name)
            a = tvm.nd.array(a_np, ctx)
            b = tvm.nd.array(np.zeros_like(b_np), ctx)
            func(a, b)
            tvm.testing.assert_allclose(b.asnumpy(), b_np, rtol=1e-5, atol=1e-5)

        check_device('llvm')
        check_device('llvm -device=arm-cpu')


    test_apply(topi.fast_exp, "fast_exp", np.exp,
               low=-88, high=88, step=0.01)
    test_apply(topi.fast_erf, "fast_erf", scipy.special.erf,
               low=-10, high=10, step=0.01)
    test_apply(topi.fast_tanh, "fast_tanh", np.tanh,
               low=-10, high=10, step=0.01)

if __name__ == "__main__":
    test_util()
    test_ewise()
    test_cast()
    test_fastmath()
