test_var_base.py

#   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.

from __future__ import print_function

import unittest
import numpy as np
import six
import copy

import paddle
import paddle.fluid as fluid
import paddle.fluid.core as core
from paddle.fluid.framework import _test_eager_guard, _in_legacy_dygraph


class TestVarBase(unittest.TestCase):

    def setUp(self):
        self.shape = [512, 1234]
        self.dtype = np.float32
        self.array = np.random.uniform(0.1, 1, self.shape).astype(self.dtype)

    def func_test_to_tensor(self):

        def _test_place(place):
            with fluid.dygraph.guard():
                paddle.set_default_dtype('float32')
                # set_default_dtype should not take effect on int
                x = paddle.to_tensor(1, place=place, stop_gradient=False)
                self.assertTrue(np.array_equal(x.numpy(), [1]))
                self.assertNotEqual(x.dtype, core.VarDesc.VarType.FP32)

                y = paddle.to_tensor(2, place=x.place)
                self.assertEqual(str(x.place), str(y.place))

                # set_default_dtype should not take effect on numpy
                x = paddle.to_tensor(np.array([1.2]).astype('float16'),
                                     place=place,
                                     stop_gradient=False)
                self.assertTrue(
                    np.array_equal(x.numpy(), np.array([1.2], 'float16')))
                self.assertEqual(x.dtype, core.VarDesc.VarType.FP16)

                # set_default_dtype take effect on int
                x = paddle.to_tensor(1, place=place)
                self.assertTrue(x.dtype, core.VarDesc.VarType.INT64)

                # set_default_dtype take effect on float
                x = paddle.to_tensor(1.2, place=place, stop_gradient=False)
                self.assertTrue(
                    np.array_equal(x.numpy(),
                                   np.array([1.2]).astype('float32')))
                self.assertEqual(x.dtype, core.VarDesc.VarType.FP32)
                clone_x = x.clone()
                self.assertTrue(
                    np.array_equal(clone_x.numpy(),
                                   np.array([1.2]).astype('float32')))
                self.assertEqual(clone_x.dtype, core.VarDesc.VarType.FP32)
                y = clone_x**2
                y.backward()
                self.assertTrue(
                    np.array_equal(x.grad.numpy(),
                                   np.array([2.4]).astype('float32')))
                y = x.cpu()
                self.assertEqual(y.place.__repr__(), "Place(cpu)")
                if core.is_compiled_with_cuda():
                    y = x.pin_memory()
                    self.assertEqual(y.place.__repr__(), "Place(gpu_pinned)")
                    y = x.cuda()
                    y = x.cuda(None)
                    self.assertEqual(y.place.__repr__(), "Place(gpu:0)")
                    y = x.cuda(device_id=0)
                    self.assertEqual(y.place.__repr__(), "Place(gpu:0)")
                    y = x.cuda(blocking=False)
                    self.assertEqual(y.place.__repr__(), "Place(gpu:0)")
                    y = x.cuda(blocking=True)
                    self.assertEqual(y.place.__repr__(), "Place(gpu:0)")
                    with self.assertRaises(ValueError):
                        y = x.cuda("test")

                # support 'dtype' is core.VarType
                x = paddle.rand((2, 2))
                y = paddle.to_tensor([2, 2], dtype=x.dtype)
                self.assertEqual(y.dtype, core.VarDesc.VarType.FP32)

                # set_default_dtype take effect on complex
                x = paddle.to_tensor(1 + 2j, place=place, stop_gradient=False)
                self.assertTrue(np.array_equal(x.numpy(), [1 + 2j]))
                self.assertEqual(x.dtype, core.VarDesc.VarType.COMPLEX64)

                paddle.set_default_dtype('float64')
                x = paddle.to_tensor(1.2, place=place, stop_gradient=False)
                self.assertTrue(np.array_equal(x.numpy(), [1.2]))
                self.assertEqual(x.dtype, core.VarDesc.VarType.FP64)

                x = paddle.to_tensor(1 + 2j, place=place, stop_gradient=False)
                self.assertTrue(np.array_equal(x.numpy(), [1 + 2j]))
                self.assertEqual(x.dtype, core.VarDesc.VarType.COMPLEX128)

                x = paddle.to_tensor(1,
                                     dtype='float32',
                                     place=place,
                                     stop_gradient=False)
                self.assertTrue(np.array_equal(x.numpy(), [1.]))
                self.assertEqual(x.dtype, core.VarDesc.VarType.FP32)
                self.assertEqual(x.shape, [1])
                self.assertEqual(x.stop_gradient, False)
                self.assertEqual(x.type, core.VarDesc.VarType.LOD_TENSOR)

                x = paddle.to_tensor((1, 2),
                                     dtype='float32',
                                     place=place,
                                     stop_gradient=False)
                x = paddle.to_tensor([1, 2],
                                     dtype='float32',
                                     place=place,
                                     stop_gradient=False)
                self.assertTrue(np.array_equal(x.numpy(), [1., 2.]))
                self.assertEqual(x.dtype, core.VarDesc.VarType.FP32)
                self.assertEqual(x.grad, None)
                self.assertEqual(x.shape, [2])
                self.assertEqual(x.stop_gradient, False)
                self.assertEqual(x.type, core.VarDesc.VarType.LOD_TENSOR)

                x = paddle.to_tensor(self.array,
                                     dtype='float32',
                                     place=place,
                                     stop_gradient=False)
                self.assertTrue(np.array_equal(x.numpy(), self.array))
                self.assertEqual(x.dtype, core.VarDesc.VarType.FP32)
                self.assertEqual(x.shape, self.shape)
                self.assertEqual(x.stop_gradient, False)
                self.assertEqual(x.type, core.VarDesc.VarType.LOD_TENSOR)

                y = paddle.to_tensor(x)
                y = paddle.to_tensor(y, dtype='float64', place=place)
                self.assertTrue(np.array_equal(y.numpy(), self.array))
                self.assertEqual(y.dtype, core.VarDesc.VarType.FP64)
                self.assertEqual(y.shape, self.shape)
                self.assertEqual(y.stop_gradient, True)
                self.assertEqual(y.type, core.VarDesc.VarType.LOD_TENSOR)
                z = x + y
                self.assertTrue(np.array_equal(z.numpy(), 2 * self.array))

                x = paddle.to_tensor([1 + 2j, 1 - 2j],
                                     dtype='complex64',
                                     place=place)
                y = paddle.to_tensor(x)
                self.assertTrue(np.array_equal(x.numpy(), [1 + 2j, 1 - 2j]))
                self.assertEqual(y.dtype, core.VarDesc.VarType.COMPLEX64)
                self.assertEqual(y.shape, [2])

                paddle.set_default_dtype('float32')
                x = paddle.randn([3, 4])
                x_array = np.array(x)
                self.assertEqual(x_array.shape, x.numpy().shape)
                self.assertEqual(x_array.dtype, x.numpy().dtype)
                self.assertTrue(np.array_equal(x_array, x.numpy()))

                x = paddle.to_tensor(1.0)
                self.assertEqual(x.item(), 1.0)
                self.assertTrue(isinstance(x.item(), float))

                x = paddle.randn([3, 2, 2])
                self.assertTrue(isinstance(x.item(5), float))
                self.assertTrue(isinstance(x.item(1, 0, 1), float))
                self.assertEqual(x.item(5), x.item(1, 0, 1))
                self.assertTrue(
                    np.array_equal(x.item(1, 0, 1),
                                   x.numpy().item(1, 0, 1)))

                x = paddle.to_tensor([[1.111111, 2.222222, 3.333333]])
                self.assertEqual(x.item(0, 2), x.item(2))
                self.assertAlmostEqual(x.item(2), 3.333333)
                self.assertTrue(isinstance(x.item(0, 2), float))

                x = paddle.to_tensor(1.0, dtype='float64')
                self.assertEqual(x.item(), 1.0)
                self.assertTrue(isinstance(x.item(), float))

                x = paddle.to_tensor(1.0, dtype='float16')
                self.assertEqual(x.item(), 1.0)
                self.assertTrue(isinstance(x.item(), float))

                x = paddle.to_tensor(1, dtype='uint8')
                self.assertEqual(x.item(), 1)
                self.assertTrue(isinstance(x.item(), int))

                x = paddle.to_tensor(1, dtype='int8')
                self.assertEqual(x.item(), 1)
                self.assertTrue(isinstance(x.item(), int))

                x = paddle.to_tensor(1, dtype='int16')
                self.assertEqual(x.item(), 1)
                self.assertTrue(isinstance(x.item(), int))

                x = paddle.to_tensor(1, dtype='int32')
                self.assertEqual(x.item(), 1)
                self.assertTrue(isinstance(x.item(), int))

                x = paddle.to_tensor(1, dtype='int64')
                self.assertEqual(x.item(), 1)
                self.assertTrue(isinstance(x.item(), int))

                x = paddle.to_tensor(True)
                self.assertEqual(x.item(), True)
                self.assertTrue(isinstance(x.item(), bool))

                x = paddle.to_tensor(1 + 1j)
                self.assertEqual(x.item(), 1 + 1j)
                self.assertTrue(isinstance(x.item(), complex))

                # empty tensor
                x = paddle.to_tensor([])
                self.assertEqual(x.shape, [0])
                expected_result = np.array([], dtype='float32')
                self.assertEqual(x.numpy().shape, expected_result.shape)
                self.assertTrue(np.array_equal(x.numpy(), expected_result))

                numpy_array = np.random.randn(3, 4)
                # covert core.LoDTensor to paddle.Tensor
                lod_tensor = paddle.fluid.core.LoDTensor()
                place = paddle.fluid.framework._current_expected_place()
                lod_tensor.set(numpy_array, place)
                x = paddle.to_tensor(lod_tensor)
                self.assertTrue(np.array_equal(x.numpy(), numpy_array))
                self.assertEqual(x.type, core.VarDesc.VarType.LOD_TENSOR)
                self.assertEqual(str(x.place), str(place))

                # covert core.Tensor to paddle.Tensor
                x = paddle.to_tensor(numpy_array)
                dlpack = x.value().get_tensor()._to_dlpack()
                tensor_from_dlpack = paddle.fluid.core.from_dlpack(dlpack)
                x = paddle.to_tensor(tensor_from_dlpack)
                self.assertTrue(np.array_equal(x.numpy(), numpy_array))
                self.assertEqual(x.type, core.VarDesc.VarType.LOD_TENSOR)

                with self.assertRaises(ValueError):
                    paddle.randn([3, 2, 2]).item()
                with self.assertRaises(ValueError):
                    paddle.randn([3, 2, 2]).item(18)
                with self.assertRaises(ValueError):
                    paddle.randn([3, 2, 2]).item(1, 2)
                with self.assertRaises(ValueError):
                    paddle.randn([3, 2, 2]).item(2, 1, 2)
                with self.assertRaises(TypeError):
                    paddle.to_tensor('test')
                with self.assertRaises(TypeError):
                    paddle.to_tensor(1, dtype='test')
                with self.assertRaises(ValueError):
                    paddle.to_tensor([[1], [2, 3]])
                with self.assertRaises(ValueError):
                    paddle.to_tensor([[1], [2, 3]], place='test')
                with self.assertRaises(ValueError):
                    paddle.to_tensor([[1], [2, 3]], place=1)

        _test_place(core.CPUPlace())
        _test_place("cpu")
        if core.is_compiled_with_cuda():
            _test_place(core.CUDAPinnedPlace())
            _test_place("gpu_pinned")
            _test_place(core.CUDAPlace(0))
            _test_place("gpu:0")
        if core.is_compiled_with_npu():
            _test_place(core.NPUPlace(0))
            _test_place("npu:0")

    def test_to_tensor(self):
        with _test_eager_guard():
            self.func_test_to_tensor()
        self.func_test_to_tensor()

    def func_test_to_tensor_not_change_input_stop_gradient(self):
        with paddle.fluid.dygraph.guard(core.CPUPlace()):
            a = paddle.zeros([1024])
            a.stop_gradient = False
            b = paddle.to_tensor(a)
            self.assertEqual(a.stop_gradient, False)
            self.assertEqual(b.stop_gradient, True)

    def test_to_tensor_not_change_input_stop_gradient(self):
        with _test_eager_guard():
            self.func_test_to_tensor_not_change_input_stop_gradient()
        self.func_test_to_tensor_not_change_input_stop_gradient()

    def func_test_to_tensor_change_place(self):
        if core.is_compiled_with_cuda():
            a_np = np.random.rand(1024, 1024)
            with paddle.fluid.dygraph.guard(core.CPUPlace()):
                a = paddle.to_tensor(a_np, place=paddle.CUDAPinnedPlace())
                a = paddle.to_tensor(a)
                self.assertEqual(a.place.__repr__(), "Place(cpu)")

            with paddle.fluid.dygraph.guard(core.CUDAPlace(0)):
                a = paddle.to_tensor(a_np, place=paddle.CUDAPinnedPlace())
                a = paddle.to_tensor(a)
                self.assertEqual(a.place.__repr__(), "Place(gpu:0)")

            with paddle.fluid.dygraph.guard(core.CUDAPlace(0)):
                a = paddle.to_tensor(a_np, place=paddle.CPUPlace())
                a = paddle.to_tensor(a, place=paddle.CUDAPinnedPlace())
                self.assertEqual(a.place.__repr__(), "Place(gpu_pinned)")

    def test_to_tensor_change_place(self):
        with _test_eager_guard():
            self.func_test_to_tensor_change_place()
        self.func_test_to_tensor_change_place()

    def func_test_to_tensor_with_lodtensor(self):
        if core.is_compiled_with_cuda():
            a_np = np.random.rand(1024, 1024)
            with paddle.fluid.dygraph.guard(core.CPUPlace()):
                lod_tensor = core.LoDTensor()
                lod_tensor.set(a_np, core.CPUPlace())
                a = paddle.to_tensor(lod_tensor)
                self.assertTrue(np.array_equal(a_np, a.numpy()))

            with paddle.fluid.dygraph.guard(core.CUDAPlace(0)):
                lod_tensor = core.LoDTensor()
                lod_tensor.set(a_np, core.CUDAPlace(0))
                a = paddle.to_tensor(lod_tensor, place=core.CPUPlace())
                self.assertTrue(np.array_equal(a_np, a.numpy()))
                self.assertTrue(a.place.__repr__(), "Place(cpu)")

    def test_to_tensor_with_lodtensor(self):
        with _test_eager_guard():
            self.func_test_to_tensor_with_lodtensor()
        self.func_test_to_tensor_with_lodtensor()

    def func_test_to_variable(self):
        with fluid.dygraph.guard():
            var = fluid.dygraph.to_variable(self.array, name="abc")
            self.assertTrue(np.array_equal(var.numpy(), self.array))
            self.assertEqual(var.name, 'abc')
            # default value
            self.assertEqual(var.persistable, False)
            self.assertEqual(var.stop_gradient, True)
            self.assertEqual(var.shape, self.shape)
            self.assertEqual(var.dtype, core.VarDesc.VarType.FP32)
            self.assertEqual(var.type, core.VarDesc.VarType.LOD_TENSOR)
            # The type of input must be 'ndarray' or 'Variable', it will raise TypeError
            with self.assertRaises(TypeError):
                var = fluid.dygraph.to_variable("test", name="abc")
            # test to_variable of LayerObjectHelper(LayerHelperBase)
            with self.assertRaises(TypeError):
                linear = fluid.dygraph.Linear(32, 64)
                var = linear._helper.to_variable("test", name="abc")

    def test_to_variable(self):
        with _test_eager_guard():
            self.func_test_to_variable()
        self.func_test_to_variable()

    def func_test_list_to_variable(self):
        with fluid.dygraph.guard():
            array = [[[1, 2], [1, 2], [1.0, 2]], [[1, 2], [1, 2], [1, 2]]]
            var = fluid.dygraph.to_variable(array, dtype='int32')
            self.assertTrue(np.array_equal(var.numpy(), array))
            self.assertEqual(var.shape, [2, 3, 2])
            self.assertEqual(var.dtype, core.VarDesc.VarType.INT32)
            self.assertEqual(var.type, core.VarDesc.VarType.LOD_TENSOR)

    def test_list_to_variable(self):
        with _test_eager_guard():
            self.func_test_list_to_variable()
        self.func_test_list_to_variable()

    def func_test_tuple_to_variable(self):
        with fluid.dygraph.guard():
            array = (((1, 2), (1, 2), (1, 2)), ((1, 2), (1, 2), (1, 2)))
            var = fluid.dygraph.to_variable(array, dtype='float32')
            self.assertTrue(np.array_equal(var.numpy(), array))
            self.assertEqual(var.shape, [2, 3, 2])
            self.assertEqual(var.dtype, core.VarDesc.VarType.FP32)
            self.assertEqual(var.type, core.VarDesc.VarType.LOD_TENSOR)

    def test_tuple_to_variable(self):
        with _test_eager_guard():
            self.func_test_tuple_to_variable()
        self.func_test_tuple_to_variable()

    def func_test_tensor_to_variable(self):
        with fluid.dygraph.guard():
            t = fluid.Tensor()
            t.set(np.random.random((1024, 1024)), fluid.CPUPlace())
            var = fluid.dygraph.to_variable(t)
            self.assertTrue(np.array_equal(t, var.numpy()))

    def test_tensor_to_variable(self):
        with _test_eager_guard():
            self.func_test_tensor_to_variable()
        self.func_test_tensor_to_variable()

    def func_test_leaf_tensor(self):
        with fluid.dygraph.guard():
            x = paddle.to_tensor(np.random.uniform(-1, 1, size=[10, 10]))
            self.assertTrue(x.is_leaf)
            y = x + 1
            self.assertTrue(y.is_leaf)

            x = paddle.to_tensor(np.random.uniform(-1, 1, size=[10, 10]),
                                 stop_gradient=False)
            self.assertTrue(x.is_leaf)
            y = x + 1
            self.assertFalse(y.is_leaf)

            linear = paddle.nn.Linear(10, 10)
            input = paddle.to_tensor(np.random.uniform(
                -1, 1, size=[10, 10]).astype('float32'),
                                     stop_gradient=False)
            self.assertTrue(input.is_leaf)

            out = linear(input)
            self.assertTrue(linear.weight.is_leaf)
            self.assertTrue(linear.bias.is_leaf)
            self.assertFalse(out.is_leaf)

    def test_leaf_tensor(self):
        with _test_eager_guard():
            self.func_test_leaf_tensor()
        self.func_test_leaf_tensor()

    def func_test_detach(self):
        with fluid.dygraph.guard():
            x = paddle.to_tensor(1.0, dtype="float64", stop_gradient=False)
            detach_x = x.detach()
            self.assertTrue(detach_x.stop_gradient, True)

            cmp_float = np.allclose if core.is_compiled_with_rocm(
            ) else np.array_equal
            detach_x[:] = 10.0
            self.assertTrue(cmp_float(x.numpy(), [10.0]))

            y = x**2
            y.backward()
            self.assertTrue(cmp_float(x.grad.numpy(), [20.0]))
            self.assertEqual(detach_x.grad, None)

            detach_x.stop_gradient = False  # Set stop_gradient to be False, supported auto-grad
            z = 3 * detach_x**2
            z.backward()
            self.assertTrue(cmp_float(x.grad.numpy(), [20.0]))
            self.assertTrue(cmp_float(detach_x.grad.numpy(), [60.0]))

            with self.assertRaises(ValueError):
                detach_x[:] = 5.0

            detach_x.stop_gradient = True

            # Due to sharing of data with origin Tensor, There are some unsafe operations:
            with self.assertRaises(RuntimeError):
                y = 2**x
                detach_x[:] = 5.0
                y.backward()

    def test_detach(self):
        with _test_eager_guard():
            self.func_test_detach()
        self.func_test_detach()

    def func_test_write_property(self):
        with fluid.dygraph.guard():
            var = fluid.dygraph.to_variable(self.array)

            self.assertEqual(var.name, 'generated_tensor_0')
            var.name = 'test'
            self.assertEqual(var.name, 'test')

            self.assertEqual(var.persistable, False)
            var.persistable = True
            self.assertEqual(var.persistable, True)

            self.assertEqual(var.stop_gradient, True)
            var.stop_gradient = False
            self.assertEqual(var.stop_gradient, False)

    def test_write_property(self):
        with _test_eager_guard():
            self.func_test_write_property()
        self.func_test_write_property()

    def func_test_deep_copy(self):
        with fluid.dygraph.guard():
            if _in_legacy_dygraph():
                empty_var = core.VarBase()
            else:
                empty_var = core.eager.Tensor()
            empty_var_copy = copy.deepcopy(empty_var)
            self.assertEqual(empty_var.stop_gradient,
                             empty_var_copy.stop_gradient)
            self.assertEqual(empty_var.persistable, empty_var_copy.persistable)
            self.assertEqual(empty_var.type, empty_var_copy.type)
            self.assertEqual(empty_var.dtype, empty_var_copy.dtype)

            x = paddle.to_tensor([2.], stop_gradient=False)
            y = paddle.to_tensor([3.], stop_gradient=False)
            z = x * y
            memo = {}
            x_copy = copy.deepcopy(x, memo)
            y_copy = copy.deepcopy(y, memo)

            self.assertEqual(x_copy.stop_gradient, y_copy.stop_gradient)
            self.assertEqual(x_copy.persistable, y_copy.persistable)
            self.assertEqual(x_copy.type, y_copy.type)
            self.assertEqual(x_copy.dtype, y_copy.dtype)
            self.assertTrue(np.array_equal(x.numpy(), x_copy.numpy()))
            self.assertTrue(np.array_equal(y.numpy(), y_copy.numpy()))

            self.assertNotEqual(id(x), id(x_copy))
            self.assertTrue(np.array_equal(x.numpy(), [2.]))

            with self.assertRaises(ValueError):
                x_copy[:] = 5.

            with self.assertRaises(RuntimeError):
                copy.deepcopy(z)

            x_copy2 = copy.deepcopy(x, memo)
            y_copy2 = copy.deepcopy(y, memo)
            self.assertEqual(id(x_copy), id(x_copy2))
            self.assertEqual(id(y_copy), id(y_copy2))

            # test copy selected rows
            if _in_legacy_dygraph():
                x = core.VarBase(core.VarDesc.VarType.FP32, [3, 100],
                                 "selected_rows",
                                 core.VarDesc.VarType.SELECTED_ROWS, True)
            else:
                x = core.eager.Tensor(core.VarDesc.VarType.FP32, [3, 100],
                                      "selected_rows",
                                      core.VarDesc.VarType.SELECTED_ROWS, True)

            selected_rows = x.value().get_selected_rows()
            selected_rows.get_tensor().set(np.random.rand(3, 100),
                                           core.CPUPlace())
            selected_rows.set_height(10)
            selected_rows.set_rows([3, 5, 7])
            x_copy = copy.deepcopy(x)

            self.assertEqual(x_copy.stop_gradient, x.stop_gradient)
            self.assertEqual(x_copy.persistable, x.persistable)
            self.assertEqual(x_copy.type, x.type)
            self.assertEqual(x_copy.dtype, x.dtype)

            copy_selected_rows = x_copy.value().get_selected_rows()
            self.assertEqual(copy_selected_rows.height(),
                             selected_rows.height())
            self.assertEqual(copy_selected_rows.rows(), selected_rows.rows())
            self.assertTrue(
                np.array_equal(np.array(copy_selected_rows.get_tensor()),
                               np.array(selected_rows.get_tensor())))

    def test_deep_copy(self):
        with _test_eager_guard():
            self.func_test_deep_copy()
        self.func_test_deep_copy()

    # test some patched methods
    def func_test_set_value(self):
        with fluid.dygraph.guard():
            var = fluid.dygraph.to_variable(self.array)
            tmp1 = np.random.uniform(0.1, 1, [2, 2, 3]).astype(self.dtype)
            self.assertRaises(AssertionError, var.set_value, tmp1)

            tmp2 = np.random.uniform(0.1, 1, self.shape).astype(self.dtype)
            var.set_value(tmp2)
            self.assertTrue(np.array_equal(var.numpy(), tmp2))

    def test_set_value(self):
        with _test_eager_guard():
            self.func_test_set_value()
        self.func_test_set_value()

    def func_test_to_string(self):
        with fluid.dygraph.guard():
            var = fluid.dygraph.to_variable(self.array)
            self.assertTrue(isinstance(str(var), str))

    def test_to_string(self):
        with _test_eager_guard():
            self.func_test_to_string()
        self.func_test_to_string()

    def func_test_element_size(self):
        with fluid.dygraph.guard():
            x = paddle.to_tensor(1, dtype='bool')
            self.assertEqual(x.element_size(), 1)

            x = paddle.to_tensor(1, dtype='float16')
            self.assertEqual(x.element_size(), 2)

            x = paddle.to_tensor(1, dtype='float32')
            self.assertEqual(x.element_size(), 4)

            x = paddle.to_tensor(1, dtype='float64')
            self.assertEqual(x.element_size(), 8)

            x = paddle.to_tensor(1, dtype='int8')
            self.assertEqual(x.element_size(), 1)

            x = paddle.to_tensor(1, dtype='int16')
            self.assertEqual(x.element_size(), 2)

            x = paddle.to_tensor(1, dtype='int32')
            self.assertEqual(x.element_size(), 4)

            x = paddle.to_tensor(1, dtype='int64')
            self.assertEqual(x.element_size(), 8)

            x = paddle.to_tensor(1, dtype='uint8')
            self.assertEqual(x.element_size(), 1)

            x = paddle.to_tensor(1, dtype='complex64')
            self.assertEqual(x.element_size(), 8)

            x = paddle.to_tensor(1, dtype='complex128')
            self.assertEqual(x.element_size(), 16)

    def test_element_size(self):
        with _test_eager_guard():
            self.func_test_element_size()
        self.func_test_element_size()

    def func_test_backward(self):
        with fluid.dygraph.guard():
            var = fluid.dygraph.to_variable(self.array)
            var.stop_gradient = False
            loss = fluid.layers.relu(var)
            loss.backward()
            grad_var = var._grad_ivar()
            self.assertEqual(grad_var.shape, self.shape)

    def test_backward(self):
        with _test_eager_guard():
            self.func_test_backward()
        self.func_test_backward()

    def func_test_gradient(self):
        with fluid.dygraph.guard():
            var = fluid.dygraph.to_variable(self.array)
            var.stop_gradient = False
            loss = fluid.layers.relu(var)
            loss.backward()
            grad_var = var.gradient()
            self.assertEqual(grad_var.shape, self.array.shape)

    def test_gradient(self):
        with _test_eager_guard():
            self.func_test_gradient()
        self.func_test_gradient()

    def func_test_block(self):
        with fluid.dygraph.guard():
            var = fluid.dygraph.to_variable(self.array)
            self.assertEqual(var.block,
                             fluid.default_main_program().global_block())

    def test_block(self):
        with _test_eager_guard():
            self.func_test_block()
        self.func_test_block()

    def _test_slice(self):
        w = fluid.dygraph.to_variable(
            np.random.random((784, 100, 100)).astype('float64'))

        for i in range(3):
            nw = w[i]
            self.assertEqual((100, 100), tuple(nw.shape))

        nw = w[:]
        self.assertEqual((784, 100, 100), tuple(nw.shape))

        nw = w[:, :]
        self.assertEqual((784, 100, 100), tuple(nw.shape))

        nw = w[:, :, -1]
        self.assertEqual((784, 100), tuple(nw.shape))

        nw = w[1, 1, 1]

        self.assertEqual(len(nw.shape), 1)
        self.assertEqual(nw.shape[0], 1)

        nw = w[:, :, :-1]
        self.assertEqual((784, 100, 99), tuple(nw.shape))

        tensor_array = np.array([[[1, 2, 3], [4, 5, 6], [7, 8, 9]],
                                 [[10, 11, 12], [13, 14, 15], [16, 17, 18]],
                                 [[19, 20, 21], [22, 23, 24],
                                  [25, 26, 27]]]).astype('float32')
        var = fluid.dygraph.to_variable(tensor_array)
        var1 = var[0, 1, 1]
        var2 = var[1:]
        var3 = var[0:1]
        var4 = var[::-1]
        var5 = var[1, 1:, 1:]
        var_reshape = fluid.layers.reshape(var, [3, -1, 3])
        var6 = var_reshape[:, :, -1]
        var7 = var[:, :, :-1]
        var8 = var[:1, :1, :1]
        var9 = var[:-1, :-1, :-1]
        var10 = var[::-1, :1, :-1]
        var11 = var[:-1, ::-1, -1:]
        var12 = var[1:2, 2:, ::-1]
        var13 = var[2:10, 2:, -2:-1]
        var14 = var[1:-1, 0:2, ::-1]
        var15 = var[::-1, ::-1, ::-1]
        var16 = var[-4:4]
        var17 = var[:, 0, 0:0]
        var18 = var[:, 1:1:2]

        vars = [
            var, var1, var2, var3, var4, var5, var6, var7, var8, var9, var10,
            var11, var12, var13, var14, var15, var16, var17, var18
        ]
        local_out = [var.numpy() for var in vars]

        self.assertTrue(np.array_equal(local_out[1], tensor_array[0, 1, 1:2]))
        self.assertTrue(np.array_equal(local_out[2], tensor_array[1:]))
        self.assertTrue(np.array_equal(local_out[3], tensor_array[0:1]))
        self.assertTrue(np.array_equal(local_out[4], tensor_array[::-1]))
        self.assertTrue(np.array_equal(local_out[5], tensor_array[1, 1:, 1:]))
        self.assertTrue(
            np.array_equal(local_out[6],
                           tensor_array.reshape((3, -1, 3))[:, :, -1]))
        self.assertTrue(np.array_equal(local_out[7], tensor_array[:, :, :-1]))
        self.assertTrue(np.array_equal(local_out[8], tensor_array[:1, :1, :1]))
        self.assertTrue(
            np.array_equal(local_out[9], tensor_array[:-1, :-1, :-1]))
        self.assertTrue(
            np.array_equal(local_out[10], tensor_array[::-1, :1, :-1]))
        self.assertTrue(
            np.array_equal(local_out[11], tensor_array[:-1, ::-1, -1:]))
        self.assertTrue(
            np.array_equal(local_out[12], tensor_array[1:2, 2:, ::-1]))
        self.assertTrue(
            np.array_equal(local_out[13], tensor_array[2:10, 2:, -2:-1]))
        self.assertTrue(
            np.array_equal(local_out[14], tensor_array[1:-1, 0:2, ::-1]))
        self.assertTrue(
            np.array_equal(local_out[15], tensor_array[::-1, ::-1, ::-1]))
        self.assertTrue(np.array_equal(local_out[16], tensor_array[-4:4]))
        self.assertTrue(np.array_equal(local_out[17], tensor_array[:, 0, 0:0]))
        self.assertTrue(np.array_equal(local_out[18], tensor_array[:, 1:1:2]))

    def _test_slice_for_tensor_attr(self):
        tensor_array = np.array([[[1, 2, 3], [4, 5, 6], [7, 8, 9]],
                                 [[10, 11, 12], [13, 14, 15], [16, 17, 18]],
                                 [[19, 20, 21], [22, 23, 24],
                                  [25, 26, 27]]]).astype('float32')

        var = paddle.to_tensor(tensor_array)

        one = paddle.ones(shape=[1], dtype="int32")
        two = paddle.full(shape=[1], fill_value=2, dtype="int32")
        negative_one = paddle.full(shape=[1], fill_value=-1, dtype="int32")
        four = paddle.full(shape=[1], fill_value=4, dtype="int32")

        var = fluid.dygraph.to_variable(tensor_array)
        var1 = var[0, one, one]
        var2 = var[one:]
        var3 = var[0:one]
        var4 = var[::negative_one]
        var5 = var[one, one:, one:]
        var_reshape = fluid.layers.reshape(var, [3, negative_one, 3])
        var6 = var_reshape[:, :, negative_one]
        var7 = var[:, :, :negative_one]
        var8 = var[:one, :one, :1]
        var9 = var[:-1, :negative_one, :negative_one]
        var10 = var[::negative_one, :one, :negative_one]
        var11 = var[:negative_one, ::-1, negative_one:]
        var12 = var[one:2, 2:, ::negative_one]
        var13 = var[two:10, 2:, -2:negative_one]
        var14 = var[1:negative_one, 0:2, ::negative_one]
        var15 = var[::negative_one, ::-1, ::negative_one]
        var16 = var[-4:4]

        vars = [
            var, var1, var2, var3, var4, var5, var6, var7, var8, var9, var10,
            var11, var12, var13, var14, var15, var16
        ]
        local_out = [var.numpy() for var in vars]

        self.assertTrue(np.array_equal(local_out[1], tensor_array[0, 1, 1:2]))
        self.assertTrue(np.array_equal(local_out[2], tensor_array[1:]))
        self.assertTrue(np.array_equal(local_out[3], tensor_array[0:1]))
        self.assertTrue(np.array_equal(local_out[4], tensor_array[::-1]))
        self.assertTrue(np.array_equal(local_out[5], tensor_array[1, 1:, 1:]))
        self.assertTrue(
            np.array_equal(local_out[6],
                           tensor_array.reshape((3, -1, 3))[:, :, -1]))
        self.assertTrue(np.array_equal(local_out[7], tensor_array[:, :, :-1]))
        self.assertTrue(np.array_equal(local_out[8], tensor_array[:1, :1, :1]))
        self.assertTrue(
            np.array_equal(local_out[9], tensor_array[:-1, :-1, :-1]))
        self.assertTrue(
            np.array_equal(local_out[10], tensor_array[::-1, :1, :-1]))
        self.assertTrue(
            np.array_equal(local_out[11], tensor_array[:-1, ::-1, -1:]))
        self.assertTrue(
            np.array_equal(local_out[12], tensor_array[1:2, 2:, ::-1]))
        self.assertTrue(
            np.array_equal(local_out[13], tensor_array[2:10, 2:, -2:-1]))
        self.assertTrue(
            np.array_equal(local_out[14], tensor_array[1:-1, 0:2, ::-1]))
        self.assertTrue(
            np.array_equal(local_out[15], tensor_array[::-1, ::-1, ::-1]))
        self.assertTrue(np.array_equal(local_out[16], tensor_array[-4:4]))

    def _test_for_getitem_ellipsis_index(self):
        shape = (64, 3, 5, 256)
        np_fp32_value = np.random.random(shape).astype('float32')
        np_int_value = np.random.randint(1, 100, shape)

        var_fp32 = paddle.to_tensor(np_fp32_value)
        var_int = paddle.to_tensor(np_int_value)

        def assert_getitem_ellipsis_index(var_tensor, var_np):
            var = [
                var_tensor[..., 0].numpy(),
                var_tensor[..., 1, 0].numpy(),
                var_tensor[0, ..., 1, 0].numpy(),
                var_tensor[1, ..., 1].numpy(),
                var_tensor[2, ...].numpy(),
                var_tensor[2, 0, ...].numpy(),
                var_tensor[2, 0, 1, ...].numpy(),
                var_tensor[...].numpy(),
                var_tensor[:, ..., 100].numpy(),
            ]

            self.assertTrue(np.array_equal(var[0], var_np[..., 0]))
            self.assertTrue(np.array_equal(var[1], var_np[..., 1, 0]))
            self.assertTrue(np.array_equal(var[2], var_np[0, ..., 1, 0]))
            self.assertTrue(np.array_equal(var[3], var_np[1, ..., 1]))
            self.assertTrue(np.array_equal(var[4], var_np[2, ...]))
            self.assertTrue(np.array_equal(var[5], var_np[2, 0, ...]))
            self.assertTrue(np.array_equal(var[6], var_np[2, 0, 1, ...]))
            self.assertTrue(np.array_equal(var[7], var_np[...]))
            self.assertTrue(np.array_equal(var[8], var_np[:, ..., 100]))

        var_fp32 = paddle.to_tensor(np_fp32_value)
        var_int = paddle.to_tensor(np_int_value)

        assert_getitem_ellipsis_index(var_fp32, np_fp32_value)
        assert_getitem_ellipsis_index(var_int, np_int_value)

        # test 1 dim tensor
        var_one_dim = paddle.to_tensor([1, 2, 3, 4])
        self.assertTrue(
            np.array_equal(var_one_dim[..., 0].numpy(), np.array([1])))

    def _test_none_index(self):
        shape = (8, 64, 5, 256)
        np_value = np.random.random(shape).astype('float32')
        var_tensor = paddle.to_tensor(np_value)

        var = [
            var_tensor[1, 0, None].numpy(),
            var_tensor[None, ..., 1, 0].numpy(),
            var_tensor[:, :, :, None].numpy(),
            var_tensor[1, ..., 1, None].numpy(),
            var_tensor[2, ..., None, None].numpy(),
            var_tensor[None, 2, 0, ...].numpy(),
            var_tensor[None, 2, None, 1].numpy(),
            var_tensor[None].numpy(),
            var_tensor[0, 0, None, 0, 0, None].numpy(),
            var_tensor[None, None, 0, ..., None].numpy(),
            var_tensor[..., None, :, None].numpy(),
            var_tensor[0, 1:10:2, None, None, ...].numpy(),
        ]

        self.assertTrue(np.array_equal(var[0], np_value[1, 0, None]))
        self.assertTrue(np.array_equal(var[1], np_value[None, ..., 1, 0]))
        self.assertTrue(np.array_equal(var[2], np_value[:, :, :, None]))
        self.assertTrue(np.array_equal(var[3], np_value[1, ..., 1, None]))
        self.assertTrue(np.array_equal(var[4], np_value[2, ..., None, None]))
        self.assertTrue(np.array_equal(var[5], np_value[None, 2, 0, ...]))
        self.assertTrue(np.array_equal(var[6], np_value[None, 2, None, 1]))
        self.assertTrue(np.array_equal(var[7], np_value[None]))
        self.assertTrue(np.array_equal(var[8], np_value[0, 0, None, 0, 0,
                                                        None]))
        self.assertTrue(
            np.array_equal(var[9], np_value[None, None, 0, ..., None]))
        self.assertTrue(np.array_equal(var[10], np_value[..., None, :, None]))

        # TODO(zyfncg) there is a bug of dimensions when slice step > 1 and
        #              indexs has int type
        # self.assertTrue(
        #     np.array_equal(var[11], np_value[0, 1:10:2, None, None, ...]))

    def _test_bool_index(self):
        shape = (4, 2, 5, 64)
        np_value = np.random.random(shape).astype('float32')
        var_tensor = paddle.to_tensor(np_value)
        index = [[True, True, True, True], [True, False, True, True],
                 [True, False, False, True], [False, 0, 1, True, True],
                 [False, False, False, False]]
        index2d = np.array([[True, True], [False, False], [True, False],
                            [True, True]])
        tensor_index = paddle.to_tensor(index2d)
        var = [
            var_tensor[index[0]].numpy(), var_tensor[index[1]].numpy(),
            var_tensor[index[2]].numpy(), var_tensor[index[3]].numpy(),
            var_tensor[paddle.to_tensor(index[0])].numpy(),
            var_tensor[tensor_index].numpy(),
            var_tensor[paddle.to_tensor(index[4])].numpy()
        ]
        self.assertTrue(np.array_equal(var[0], np_value[index[0]]))
        self.assertTrue(np.array_equal(var[1], np_value[index[1]]))
        self.assertTrue(np.array_equal(var[2], np_value[index[2]]))
        self.assertTrue(np.array_equal(var[3], np_value[index[3]]))
        self.assertTrue(np.array_equal(var[4], np_value[index[0]]))
        self.assertTrue(np.array_equal(var[5], np_value[index2d]))
        self.assertTrue(np.array_equal(var[6], np_value[index[4]]))
        self.assertTrue(
            np.array_equal(var_tensor[var_tensor > 0.67],
                           np_value[np_value > 0.67]))
        self.assertTrue(
            np.array_equal(var_tensor[var_tensor < 0.55],
                           np_value[np_value < 0.55]))

        with self.assertRaises(ValueError):
            var_tensor[[False, False, False, False]]
        with self.assertRaises(ValueError):
            var_tensor[[True, False]]
        with self.assertRaises(ValueError):
            var_tensor[[True, False, False, False, False]]
        with self.assertRaises(IndexError):
            var_tensor[paddle.to_tensor([[True, False, False, False]])]

    def _test_scalar_bool_index(self):
        shape = (1, 2, 5, 64)
        np_value = np.random.random(shape).astype('float32')
        var_tensor = paddle.to_tensor(np_value)
        index = [True]
        tensor_index = paddle.to_tensor(index)
        var = [
            var_tensor[tensor_index].numpy(),
        ]
        self.assertTrue(np.array_equal(var[0], np_value[index]))

    def _test_for_var(self):
        np_value = np.random.random((30, 100, 100)).astype('float32')
        w = fluid.dygraph.to_variable(np_value)

        for i, e in enumerate(w):
            self.assertTrue(np.array_equal(e.numpy(), np_value[i]))

    def _test_numpy_index(self):
        array = np.arange(120).reshape([4, 5, 6])
        t = paddle.to_tensor(array)
        self.assertTrue(np.array_equal(t[np.longlong(0)].numpy(), array[0]))
        self.assertTrue(
            np.array_equal(
                t[np.longlong(0):np.longlong(4):np.longlong(2)].numpy(),
                array[0:4:2]))
        self.assertTrue(np.array_equal(t[np.int64(0)].numpy(), array[0]))
        self.assertTrue(
            np.array_equal(t[np.int32(1):np.int32(4):np.int32(2)].numpy(),
                           array[1:4:2]))
        self.assertTrue(
            np.array_equal(t[np.int16(0):np.int16(4):np.int16(2)].numpy(),
                           array[0:4:2]))

    def _test_list_index(self):
        # case1:
        array = np.arange(120).reshape([6, 5, 4])
        x = paddle.to_tensor(array)
        py_idx = [[0, 2, 0, 1, 3], [0, 0, 1, 2, 0]]
        idx = [paddle.to_tensor(py_idx[0]), paddle.to_tensor(py_idx[1])]
        self.assertTrue(np.array_equal(x[idx].numpy(), array[py_idx]))
        self.assertTrue(np.array_equal(x[py_idx].numpy(), array[py_idx]))
        # case2:
        tensor_x = paddle.to_tensor(
            np.zeros(12).reshape(2, 6).astype(np.float32))
        tensor_y1 = paddle.zeros([1], dtype='int32') + 2
        tensor_y2 = paddle.zeros([1], dtype='int32') + 5
        tensor_x[:, tensor_y1:tensor_y2] = 42
        res = tensor_x.numpy()
        exp = np.array([[0., 0., 42., 42., 42., 0.],
                        [0., 0., 42., 42., 42., 0.]])
        self.assertTrue(np.array_equal(res, exp))

        # case3:
        row = np.array([0, 1, 2])
        col = np.array([2, 1, 3])
        self.assertTrue(np.array_equal(array[row, col], x[row, col].numpy()))

    def func_test_slice(self):
        with fluid.dygraph.guard():
            self._test_slice()
            self._test_slice_for_tensor_attr()
            self._test_for_var()
            self._test_for_getitem_ellipsis_index()
            self._test_none_index()
            self._test_bool_index()
            self._test_scalar_bool_index()
            self._test_numpy_index()
            self._test_list_index()

            var = fluid.dygraph.to_variable(self.array)
            self.assertTrue(np.array_equal(var[1, :].numpy(), self.array[1, :]))
            self.assertTrue(np.array_equal(var[::-1].numpy(), self.array[::-1]))

            with self.assertRaises(IndexError):
                y = var[self.shape[0]]

            with self.assertRaises(IndexError):
                y = var[0 - self.shape[0] - 1]

            with self.assertRaises(IndexError):
                mask = np.array([1, 0, 1, 0], dtype=bool)
                var[paddle.to_tensor([0, 1]), mask]

    def test_slice(self):
        with _test_eager_guard():
            self.func_test_slice()
        self.func_test_slice()

    def func_test_var_base_to_np(self):
        with fluid.dygraph.guard():
            var = fluid.dygraph.to_variable(self.array)
            self.assertTrue(
                np.array_equal(var.numpy(),
                               fluid.framework._var_base_to_np(var)))

    def test_var_base_to_np(self):
        with _test_eager_guard():
            self.func_test_var_base_to_np()
        self.func_test_var_base_to_np()

    def func_test_var_base_as_np(self):
        with fluid.dygraph.guard():
            var = fluid.dygraph.to_variable(self.array)
            self.assertTrue(np.array_equal(var.numpy(), np.array(var)))
            self.assertTrue(
                np.array_equal(var.numpy(), np.array(var, dtype=np.float32)))

    def test_var_base_as_np(self):
        with _test_eager_guard():
            self.func_test_var_base_as_np()
        self.func_test_var_base_as_np()

    def func_test_if(self):
        with fluid.dygraph.guard():
            var1 = fluid.dygraph.to_variable(np.array([[[0]]]))
            var2 = fluid.dygraph.to_variable(np.array([[[1]]]))

            var1_bool = False
            var2_bool = False

            if var1:
                var1_bool = True

            if var2:
                var2_bool = True

            assert var1_bool == False, "if var1 should be false"
            assert var2_bool == True, "if var2 should be true"
            assert bool(var1) == False, "bool(var1) is False"
            assert bool(var2) == True, "bool(var2) is True"

    def test_if(self):
        with _test_eager_guard():
            self.func_test_if()
        self.func_test_if()

    def func_test_to_static_var(self):
        with fluid.dygraph.guard():
            # Convert VarBase into Variable or Parameter
            var_base = fluid.dygraph.to_variable(self.array, name="var_base_1")
            static_var = var_base._to_static_var()
            self._assert_to_static(var_base, static_var)

            var_base = fluid.dygraph.to_variable(self.array, name="var_base_2")
            static_param = var_base._to_static_var(to_parameter=True)
            self._assert_to_static(var_base, static_param, True)

            # Convert ParamBase into Parameter
            fc = fluid.dygraph.Linear(
                10,
                20,
                param_attr=fluid.ParamAttr(
                    learning_rate=0.001,
                    do_model_average=True,
                    regularizer=fluid.regularizer.L1Decay()))
            weight = fc.parameters()[0]
            static_param = weight._to_static_var()
            self._assert_to_static(weight, static_param, True)

    def test_to_static_var(self):
        with _test_eager_guard():
            self.func_test_to_static_var()
        self.func_test_to_static_var()

    def _assert_to_static(self, var_base, static_var, is_param=False):
        if is_param:
            self.assertTrue(isinstance(static_var, fluid.framework.Parameter))
            self.assertTrue(static_var.persistable, True)
            if isinstance(var_base, fluid.framework.ParamBase):
                for attr in ['trainable', 'is_distributed', 'do_model_average']:
                    self.assertEqual(getattr(var_base, attr),
                                     getattr(static_var, attr))

                self.assertEqual(static_var.optimize_attr['learning_rate'],
                                 0.001)
                self.assertTrue(
                    isinstance(static_var.regularizer,
                               fluid.regularizer.L1Decay))
        else:
            self.assertTrue(isinstance(static_var, fluid.framework.Variable))

        attr_keys = ['block', 'dtype', 'type', 'name']
        for attr in attr_keys:
            self.assertEqual(getattr(var_base, attr), getattr(static_var, attr))

        self.assertListEqual(list(var_base.shape), list(static_var.shape))

    def func_test_tensor_str(self):
        paddle.enable_static()
        paddle.disable_static(paddle.CPUPlace())
        paddle.seed(10)
        a = paddle.rand([10, 20])
        paddle.set_printoptions(4, 100, 3)
        a_str = str(a)

        expected = '''Tensor(shape=[10, 20], dtype=float32, place=Place(cpu), stop_gradient=True,
       [[0.2727, 0.5489, 0.8655, ..., 0.2916, 0.8525, 0.9000],
        [0.3806, 0.8996, 0.0928, ..., 0.9535, 0.8378, 0.6409],
        [0.1484, 0.4038, 0.8294, ..., 0.0148, 0.6520, 0.4250],
        ...,
        [0.3426, 0.1909, 0.7240, ..., 0.4218, 0.2676, 0.5679],
        [0.5561, 0.2081, 0.0676, ..., 0.9778, 0.3302, 0.9559],
        [0.2665, 0.8483, 0.5389, ..., 0.4956, 0.6862, 0.9178]])'''

        self.assertEqual(a_str, expected)

    def test_tensor_str(self):
        with _test_eager_guard():
            self.func_test_tensor_str()
        self.func_test_tensor_str()

    def func_test_tensor_str2(self):
        paddle.disable_static(paddle.CPUPlace())
        a = paddle.to_tensor([[1.5111111, 1.0], [0, 0]])
        a_str = str(a)

        expected = '''Tensor(shape=[2, 2], dtype=float32, place=Place(cpu), stop_gradient=True,
       [[1.5111, 1.    ],
        [0.    , 0.    ]])'''

        self.assertEqual(a_str, expected)

    def test_tensor_str2(self):
        with _test_eager_guard():
            self.func_test_tensor_str2()
        self.func_test_tensor_str2()

    def func_test_tensor_str3(self):
        paddle.disable_static(paddle.CPUPlace())
        a = paddle.to_tensor([[-1.5111111, 1.0], [0, -0.5]])
        a_str = str(a)

        expected = '''Tensor(shape=[2, 2], dtype=float32, place=Place(cpu), stop_gradient=True,
       [[-1.5111,  1.    ],
        [ 0.    , -0.5000]])'''

        self.assertEqual(a_str, expected)

    def test_tensor_str3(self):
        with _test_eager_guard():
            self.func_test_tensor_str3()
        self.func_test_tensor_str3()

    def func_test_tensor_str_scaler(self):
        paddle.disable_static(paddle.CPUPlace())
        a = paddle.to_tensor(np.array(False))
        a_str = str(a)

        expected = '''Tensor(shape=[], dtype=bool, place=Place(cpu), stop_gradient=True,
       False)'''

        self.assertEqual(a_str, expected)

    def test_tensor_str_scaler(self):
        with _test_eager_guard():
            self.func_test_tensor_str_scaler()
        self.func_test_tensor_str_scaler()

    def func_test_tensor_str_shape_with_zero(self):
        paddle.disable_static(paddle.CPUPlace())
        x = paddle.ones((10, 10))
        y = paddle.fluid.layers.where(x == 0)
        a_str = str(y)

        expected = '''Tensor(shape=[0, 2], dtype=int64, place=Place(cpu), stop_gradient=True,
       [])'''

        self.assertEqual(a_str, expected)

    def test_tensor_str_shape_with_zero(self):
        with _test_eager_guard():
            self.func_test_tensor_str_shape_with_zero()
        self.func_test_tensor_str_shape_with_zero()

    def func_test_tensor_str_linewidth(self):
        paddle.disable_static(paddle.CPUPlace())
        paddle.seed(2021)
        x = paddle.rand([128])
        paddle.set_printoptions(precision=4,
                                threshold=1000,
                                edgeitems=3,
                                linewidth=80)
        a_str = str(x)

        expected = '''Tensor(shape=[128], dtype=float32, place=Place(cpu), stop_gradient=True,
       [0.3759, 0.0278, 0.2489, 0.3110, 0.9105, 0.7381, 0.1905, 0.4726, 0.2435,
        0.9142, 0.3367, 0.7243, 0.7664, 0.9915, 0.2921, 0.1363, 0.8096, 0.2915,
        0.9564, 0.9972, 0.2573, 0.2597, 0.3429, 0.2484, 0.9579, 0.7003, 0.4126,
        0.4274, 0.0074, 0.9686, 0.9910, 0.0144, 0.6564, 0.2932, 0.7114, 0.9301,
        0.6421, 0.0538, 0.1273, 0.5771, 0.9336, 0.6416, 0.1832, 0.9311, 0.7702,
        0.7474, 0.4479, 0.3382, 0.5579, 0.0444, 0.9802, 0.9874, 0.3038, 0.5640,
        0.2408, 0.5489, 0.8866, 0.1006, 0.5881, 0.7560, 0.7928, 0.8604, 0.4670,
        0.9285, 0.1482, 0.4541, 0.1307, 0.6221, 0.4902, 0.1147, 0.4415, 0.2987,
        0.7276, 0.2077, 0.7551, 0.9652, 0.4369, 0.2282, 0.0047, 0.2934, 0.4308,
        0.4190, 0.1442, 0.3650, 0.3056, 0.6535, 0.1211, 0.8721, 0.7408, 0.4220,
        0.5937, 0.3123, 0.9198, 0.0275, 0.5338, 0.4622, 0.7521, 0.3609, 0.4703,
        0.1736, 0.8976, 0.7616, 0.3756, 0.2416, 0.2907, 0.3246, 0.4305, 0.5717,
        0.0735, 0.0361, 0.5534, 0.4399, 0.9260, 0.6525, 0.3064, 0.4573, 0.9210,
        0.8269, 0.2424, 0.7494, 0.8945, 0.7098, 0.8078, 0.4707, 0.5715, 0.7232,
        0.4678, 0.5047])'''

        self.assertEqual(a_str, expected)

    def test_tensor_str_linewidth(self):
        with _test_eager_guard():
            self.func_test_tensor_str_linewidth()
        self.func_test_tensor_str_linewidth()

    def func_test_tensor_str_linewidth2(self):
        paddle.disable_static(paddle.CPUPlace())
        paddle.seed(2021)
        x = paddle.rand([128])
        paddle.set_printoptions(precision=4, linewidth=160, sci_mode=True)
        a_str = str(x)

        expected = '''Tensor(shape=[128], dtype=float32, place=Place(cpu), stop_gradient=True,
       [3.7587e-01, 2.7798e-02, 2.4891e-01, 3.1097e-01, 9.1053e-01, 7.3811e-01, 1.9045e-01, 4.7258e-01, 2.4354e-01, 9.1415e-01, 3.3666e-01, 7.2428e-01,
        7.6640e-01, 9.9146e-01, 2.9215e-01, 1.3625e-01, 8.0957e-01, 2.9153e-01, 9.5642e-01, 9.9718e-01, 2.5732e-01, 2.5973e-01, 3.4292e-01, 2.4841e-01,
        9.5794e-01, 7.0029e-01, 4.1260e-01, 4.2737e-01, 7.3788e-03, 9.6863e-01, 9.9102e-01, 1.4416e-02, 6.5640e-01, 2.9318e-01, 7.1136e-01, 9.3008e-01,
        6.4209e-01, 5.3849e-02, 1.2730e-01, 5.7712e-01, 9.3359e-01, 6.4155e-01, 1.8320e-01, 9.3110e-01, 7.7021e-01, 7.4736e-01, 4.4793e-01, 3.3817e-01,
        5.5794e-01, 4.4412e-02, 9.8023e-01, 9.8735e-01, 3.0376e-01, 5.6397e-01, 2.4082e-01, 5.4893e-01, 8.8659e-01, 1.0065e-01, 5.8812e-01, 7.5600e-01,
        7.9280e-01, 8.6041e-01, 4.6701e-01, 9.2852e-01, 1.4821e-01, 4.5410e-01, 1.3074e-01, 6.2210e-01, 4.9024e-01, 1.1466e-01, 4.4154e-01, 2.9868e-01,
        7.2758e-01, 2.0766e-01, 7.5508e-01, 9.6522e-01, 4.3688e-01, 2.2823e-01, 4.7394e-03, 2.9342e-01, 4.3083e-01, 4.1902e-01, 1.4416e-01, 3.6500e-01,
        3.0560e-01, 6.5350e-01, 1.2115e-01, 8.7206e-01, 7.4081e-01, 4.2203e-01, 5.9372e-01, 3.1230e-01, 9.1979e-01, 2.7486e-02, 5.3383e-01, 4.6224e-01,
        7.5211e-01, 3.6094e-01, 4.7034e-01, 1.7355e-01, 8.9763e-01, 7.6165e-01, 3.7557e-01, 2.4157e-01, 2.9074e-01, 3.2458e-01, 4.3049e-01, 5.7171e-01,
        7.3509e-02, 3.6087e-02, 5.5341e-01, 4.3993e-01, 9.2601e-01, 6.5248e-01, 3.0640e-01, 4.5727e-01, 9.2104e-01, 8.2688e-01, 2.4243e-01, 7.4937e-01,
        8.9448e-01, 7.0981e-01, 8.0783e-01, 4.7065e-01, 5.7154e-01, 7.2319e-01, 4.6777e-01, 5.0465e-01])'''

        self.assertEqual(a_str, expected)

    def test_tensor_str_linewidth2(self):
        with _test_eager_guard():
            self.func_test_tensor_str_linewidth2()
        self.func_test_tensor_str_linewidth2()

    def func_tensor_str_bf16(self):
        paddle.disable_static(paddle.CPUPlace())
        a = paddle.to_tensor([[1.5, 1.0], [0, 0]])
        a = paddle.cast(a, dtype=core.VarDesc.VarType.BF16)
        paddle.set_printoptions(precision=4)
        a_str = str(a)

        expected = '''Tensor(shape=[2, 2], dtype=bfloat16, place=Place(cpu), stop_gradient=True,
       [[1.5000, 1.    ],
        [0.    , 0.    ]])'''

        self.assertEqual(a_str, expected)

    def test_tensor_str_bf16(self):
        with _test_eager_guard():
            self.func_tensor_str_bf16()
        self.func_tensor_str_bf16()

    def test_tensor_str_bf16(self):
        with _test_eager_guard():
            self.func_tensor_str_bf16()
        self.func_tensor_str_bf16()

    def func_test_print_tensor_dtype(self):
        paddle.disable_static(paddle.CPUPlace())
        a = paddle.rand([1])
        a_str = str(a.dtype)

        expected = 'paddle.float32'

        self.assertEqual(a_str, expected)

    def test_print_tensor_dtype(self):
        with _test_eager_guard():
            self.func_test_print_tensor_dtype()
        self.func_test_print_tensor_dtype()


class TestVarBaseSetitem(unittest.TestCase):

    def func_setUp(self):
        self.set_dtype()
        self.tensor_x = paddle.to_tensor(np.ones((4, 2, 3)).astype(self.dtype))
        self.np_value = np.random.random((2, 3)).astype(self.dtype)
        self.tensor_value = paddle.to_tensor(self.np_value)

    def set_dtype(self):
        self.dtype = "int32"

    def _test(self, value):
        if _in_legacy_dygraph():
            self.assertEqual(self.tensor_x.inplace_version, 0)

        id_origin = id(self.tensor_x)
        self.tensor_x[0] = value
        if _in_legacy_dygraph():
            self.assertEqual(self.tensor_x.inplace_version, 1)

        if isinstance(value, (six.integer_types, float)):
            result = np.zeros((2, 3)).astype(self.dtype) + value

        else:
            result = self.np_value

        self.assertTrue(np.array_equal(self.tensor_x[0].numpy(), result))
        self.assertEqual(id_origin, id(self.tensor_x))

        self.tensor_x[1:2] = value
        if _in_legacy_dygraph():
            self.assertEqual(self.tensor_x.inplace_version, 2)
        self.assertTrue(np.array_equal(self.tensor_x[1].numpy(), result))
        self.assertEqual(id_origin, id(self.tensor_x))

        self.tensor_x[...] = value
        if _in_legacy_dygraph():
            self.assertEqual(self.tensor_x.inplace_version, 3)
        self.assertTrue(np.array_equal(self.tensor_x[3].numpy(), result))
        self.assertEqual(id_origin, id(self.tensor_x))

    def func_test_value_tensor(self):
        self._test(self.tensor_value)

    def test_value_tensor(self):
        with _test_eager_guard():
            self.func_setUp()
            self.func_test_value_tensor()
        self.func_setUp()
        self.func_test_value_tensor()

    def func_test_value_numpy(self):
        self._test(self.np_value)

    def test_value_numpy(self):
        with _test_eager_guard():
            self.func_setUp()
            self.func_test_value_numpy()
        self.func_setUp()
        self.func_test_value_numpy()

    def func_test_value_int(self):
        self._test(10)

    def test_value_int(self):
        with _test_eager_guard():
            self.func_setUp()
            self.func_test_value_int()
        self.func_setUp()
        self.func_test_value_int()


class TestVarBaseSetitemInt64(TestVarBaseSetitem):

    def set_dtype(self):
        self.dtype = "int64"


class TestVarBaseSetitemFp32(TestVarBaseSetitem):

    def set_dtype(self):
        self.dtype = "float32"

    def func_test_value_float(self):
        paddle.disable_static()
        self._test(3.3)

    def test_value_float(self):
        with _test_eager_guard():
            self.func_setUp()
            self.func_test_value_float()
        self.func_setUp()
        self.func_test_value_float()


class TestVarBaseSetitemFp64(TestVarBaseSetitem):

    def set_dtype(self):
        self.dtype = "float64"


class TestVarBaseSetitemBoolIndex(unittest.TestCase):

    def func_setUp(self):
        paddle.disable_static()
        self.set_dtype()
        self.set_input()

    def set_input(self):
        self.tensor_x = paddle.to_tensor(np.ones((4, 2, 3)).astype(self.dtype))
        self.np_value = np.random.random((2, 3)).astype(self.dtype)
        self.tensor_value = paddle.to_tensor(self.np_value)

    def set_dtype(self):
        self.dtype = "int32"

    def _test(self, value):
        paddle.disable_static()
        self.assertEqual(self.tensor_x.inplace_version, 0)

        id_origin = id(self.tensor_x)
        index_1 = paddle.to_tensor(np.array([True, False, False, False]))
        self.tensor_x[index_1] = value
        self.assertEqual(self.tensor_x.inplace_version, 1)

        if isinstance(value, (six.integer_types, float)):
            result = np.zeros((2, 3)).astype(self.dtype) + value

        else:
            result = self.np_value

        self.assertTrue(np.array_equal(self.tensor_x[0].numpy(), result))
        self.assertEqual(id_origin, id(self.tensor_x))

        index_2 = paddle.to_tensor(np.array([False, True, False, False]))
        self.tensor_x[index_2] = value
        self.assertEqual(self.tensor_x.inplace_version, 2)
        self.assertTrue(np.array_equal(self.tensor_x[1].numpy(), result))
        self.assertEqual(id_origin, id(self.tensor_x))

        index_3 = paddle.to_tensor(np.array([True, True, True, True]))
        self.tensor_x[index_3] = value
        self.assertEqual(self.tensor_x.inplace_version, 3)
        self.assertTrue(np.array_equal(self.tensor_x[3].numpy(), result))
        self.assertEqual(id_origin, id(self.tensor_x))

    def func_test_value_tensor(self):
        paddle.disable_static()
        self._test(self.tensor_value)

    def test_value_tensor(self):
        with _test_eager_guard():
            self.func_setUp()
            self.func_test_value_tensor()
        self.func_setUp()
        self.func_test_value_tensor()

    def func_test_value_numpy(self):
        paddle.disable_static()
        self._test(self.np_value)

    def test_value_numpy(self):
        with _test_eager_guard():
            self.func_setUp()
            self.func_test_value_numpy()
        self.func_setUp()
        self.func_test_value_numpy()

    def func_test_value_int(self):
        paddle.disable_static()
        self._test(10)

    def test_value_int(self):
        with _test_eager_guard():
            self.func_setUp()
            self.func_test_value_int()
        self.func_setUp()
        self.func_test_value_int()


class TestVarBaseSetitemBoolScalarIndex(unittest.TestCase):

    def set_input(self):
        self.tensor_x = paddle.to_tensor(np.ones((1, 2, 3)).astype(self.dtype))
        self.np_value = np.random.random((2, 3)).astype(self.dtype)
        self.tensor_value = paddle.to_tensor(self.np_value)

    def _test(self, value):
        paddle.disable_static()
        self.assertEqual(self.tensor_x.inplace_version, 0)

        id_origin = id(self.tensor_x)
        index = paddle.to_tensor(np.array([True]))
        self.tensor_x[index] = value
        self.assertEqual(self.tensor_x.inplace_version, 1)

        if isinstance(value, (six.integer_types, float)):
            result = np.zeros((2, 3)).astype(self.dtype) + value

        else:
            result = self.np_value

        self.assertTrue(np.array_equal(self.tensor_x[0].numpy(), result))
        self.assertEqual(id_origin, id(self.tensor_x))


class TestVarBaseInplaceVersion(unittest.TestCase):

    def func_test_setitem(self):
        paddle.disable_static()

        var = paddle.ones(shape=[4, 2, 3], dtype="float32")
        self.assertEqual(var.inplace_version, 0)

        var[1] = 1
        self.assertEqual(var.inplace_version, 1)

        var[1:2] = 1
        self.assertEqual(var.inplace_version, 2)

    def test_setitem(self):
        with _test_eager_guard():
            self.func_test_setitem()
        self.func_test_setitem()

    def func_test_bump_inplace_version(self):
        paddle.disable_static()
        var = paddle.ones(shape=[4, 2, 3], dtype="float32")
        self.assertEqual(var.inplace_version, 0)

        var._bump_inplace_version()
        self.assertEqual(var.inplace_version, 1)

        var._bump_inplace_version()
        self.assertEqual(var.inplace_version, 2)

    def test_bump_inplace_version(self):
        with _test_eager_guard():
            self.func_test_bump_inplace_version()
        self.func_test_bump_inplace_version()


class TestVarBaseSlice(unittest.TestCase):

    def func_test_slice(self):
        paddle.disable_static()
        np_x = np.random.random((3, 8, 8))
        x = paddle.to_tensor(np_x, dtype="float64")
        actual_x = x._slice(0, 1)
        actual_x = paddle.to_tensor(actual_x)
        self.assertEqual(actual_x.numpy().all(), np_x[0:1].all())

    def test_slice(self):
        with _test_eager_guard():
            self.func_test_slice()
        self.func_test_slice()


class TestVarBaseClear(unittest.TestCase):

    def func_test_clear(self):
        paddle.disable_static()
        np_x = np.random.random((3, 8, 8))
        x = paddle.to_tensor(np_x, dtype="float64")
        x._clear()
        self.assertEqual(str(x), "Tensor(Not initialized)")

    def test_clear(self):
        with _test_eager_guard():
            self.func_test_clear()
        self.func_test_clear()


class TestVarBaseOffset(unittest.TestCase):

    def func_offset(self):
        paddle.disable_static()
        np_x = np.random.random((3, 8, 8))
        x = paddle.to_tensor(np_x, dtype="float64")
        expected_offset = 0
        actual_x = x._slice(expected_offset, 1)
        actual_x = paddle.to_tensor(actual_x)
        self.assertEqual(actual_x._offset(), expected_offset)

    def test_offset(self):
        with _test_eager_guard():
            self.func_offset()
        self.func_offset()


class TestVarBaseShareBufferTo(unittest.TestCase):

    def func_test_share_buffer_To(self):
        paddle.disable_static()
        np_src = np.random.random((3, 8, 8))
        src = paddle.to_tensor(np_src, dtype="float64")
        # empty_var
        if _in_legacy_dygraph():
            dst = core.VarBase()
        else:
            dst = core.eager.Tensor()
        src._share_buffer_to(dst)
        self.assertEqual(src._is_shared_buffer_with(dst), True)

    def test_share_buffer_To(self):
        with _test_eager_guard():
            self.func_test_share_buffer_To()
        self.func_test_share_buffer_To()


class TestVarBaseTo(unittest.TestCase):

    def func_setUp(self):
        paddle.disable_static()
        self.np_x = np.random.random((3, 8, 8))
        self.x = paddle.to_tensor(self.np_x, dtype="float32")

    def func_test_to_api(self):
        x_double = self.x._to(dtype='double')
        self.assertEqual(x_double.dtype, paddle.fluid.core.VarDesc.VarType.FP64)
        self.assertTrue(np.allclose(self.np_x, x_double))

        x_ = self.x._to()
        self.assertEqual(self.x.dtype, paddle.fluid.core.VarDesc.VarType.FP64)
        self.assertTrue(np.allclose(self.np_x, x_))

        if paddle.fluid.is_compiled_with_cuda():
            x_gpu = self.x._to(device=paddle.CUDAPlace(0))
            self.assertTrue(x_gpu.place.is_gpu_place())
            self.assertEqual(x_gpu.place.gpu_device_id(), 0)

            x_gpu0 = self.x._to(device='gpu:0')
            self.assertTrue(x_gpu0.place.is_gpu_place())
            self.assertEqual(x_gpu0.place.gpu_device_id(), 0)

            x_gpu1 = self.x._to(device='gpu:0', dtype="float64")
            self.assertTrue(x_gpu1.place.is_gpu_place())
            self.assertEqual(x_gpu1.place.gpu_device_id(), 0)
            self.assertEqual(x_gpu1.dtype,
                             paddle.fluid.core.VarDesc.VarType.FP64)

            x_gpu2 = self.x._to(device='gpu:0', dtype="float16")
            self.assertTrue(x_gpu2.place.is_gpu_place())
            self.assertEqual(x_gpu2.place.gpu_device_id(), 0)
            self.assertEqual(x_gpu2.dtype,
                             paddle.fluid.core.VarDesc.VarType.FP16)

        x_cpu = self.x._to(device=paddle.CPUPlace())
        self.assertTrue(x_cpu.place.is_cpu_place())

        x_cpu0 = self.x._to(device='cpu')
        self.assertTrue(x_cpu0.place.is_cpu_place())

        x_cpu1 = self.x._to(device=paddle.CPUPlace(), dtype="float64")
        self.assertTrue(x_cpu1.place.is_cpu_place())
        self.assertEqual(x_cpu1.dtype, paddle.fluid.core.VarDesc.VarType.FP64)

        x_cpu2 = self.x._to(device='cpu', dtype="float16")
        self.assertTrue(x_cpu2.place.is_cpu_place())
        self.assertEqual(x_cpu2.dtype, paddle.fluid.core.VarDesc.VarType.FP16)

        self.assertRaises(ValueError, self.x._to, device=1)
        self.assertRaises(AssertionError, self.x._to, blocking=1)

    def test_to_api(self):
        with _test_eager_guard():
            self.func_setUp()
            self.func_test_to_api()
        self.func_setUp()
        self.func_test_to_api()


class TestVarBaseInitVarBaseFromTensorWithDevice(unittest.TestCase):

    def func_test_varbase_init(self):
        paddle.disable_static()
        t = fluid.Tensor()
        np_x = np.random.random((3, 8, 8))
        t.set(np_x, fluid.CPUPlace())

        if paddle.fluid.is_compiled_with_cuda():
            device = paddle.CUDAPlace(0)
            if _in_legacy_dygraph():
                tmp = fluid.core.VarBase(t, device)
            else:
                tmp = fluid.core.eager.Tensor(t, device)
            self.assertTrue(tmp.place.is_gpu_place())
            self.assertEqual(tmp.numpy().all(), np_x.all())

        device = paddle.CPUPlace()
        if _in_legacy_dygraph():
            tmp = fluid.core.VarBase(t, device)
        else:
            tmp = fluid.core.eager.Tensor(t, device)
        self.assertEqual(tmp.numpy().all(), np_x.all())

    def test_varbase_init(self):
        with _test_eager_guard():
            self.func_test_varbase_init()
        self.func_test_varbase_init()


class TestVarBaseNumel(unittest.TestCase):

    def func_test_numel_normal(self):
        paddle.disable_static()
        np_x = np.random.random((3, 8, 8))
        x = paddle.to_tensor(np_x, dtype="float64")
        x_actual_numel = x._numel()
        x_expected_numel = np.product((3, 8, 8))
        self.assertEqual(x_actual_numel, x_expected_numel)

    def test_numel_normal(self):
        with _test_eager_guard():
            self.func_test_numel_normal()
        self.func_test_numel_normal()

    def func_test_numel_without_holder(self):
        paddle.disable_static()
        if _in_legacy_dygraph():
            x_without_holder = core.VarBase()
        else:
            x_without_holder = core.eager.Tensor()
        x_actual_numel = x_without_holder._numel()
        self.assertEqual(x_actual_numel, 0)

    def ttest_numel_without_holder(self):
        with _test_eager_guard():
            self.func_test_numel_without_holder()
        self.func_test_numel_without_holder()


class TestVarBaseCopyGradientFrom(unittest.TestCase):

    def func_test_copy_gradient_from(self):
        paddle.disable_static()
        np_x = np.random.random((2, 2))
        np_y = np.random.random((2, 2))
        x = paddle.to_tensor(np_x, dtype="float64", stop_gradient=False)
        y = paddle.to_tensor(np_y, dtype="float64")
        out = x + x
        out.backward()
        x._copy_gradient_from(y)
        self.assertEqual(x.grad.numpy().all(), np_y.all())

    def test_copy_gradient_from(self):
        with _test_eager_guard():
            self.func_test_copy_gradient_from()
        self.func_test_copy_gradient_from()


class TestEagerTensorGradNameValue(unittest.TestCase):

    def test_eager_tensor_grad_name_value(self):
        with _test_eager_guard():
            a_np = np.array([2, 3]).astype('float32')
            a = paddle.to_tensor(a_np)
            a.stop_gradient = False
            b = a**2
            self.assertEqual(a._grad_value(), None)
            b.backward()
            # Note, for new dygraph, there are no generated grad name, so we skip the name check.
            self.assertNotEqual(a._grad_value(), None)


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