[Cherry-pick 2.0] Migrate 4 APIs about array to paddle.tensor.* (#29565) (#30101)

4 APIs: array_length, array_read, array_write, create_array，cherry-pick #29565

python/paddle/fluid/tests/unittests/test_array_read_write_op.py

@@ -15,6 +15,8 @@
 from __future__ import print_function
 
 import unittest
+
+import paddle
 import paddle.fluid as fluid
 import paddle.fluid.core as core
 import paddle.fluid.layers as layers
@@ -127,17 +129,53 @@ class TestArrayReadWrite(unittest.TestCase):
 
 
 class TestArrayReadWriteOpError(unittest.TestCase):
-    def test_errors(self):
+    def _test_errors(self, use_fluid_api=True):
+        if use_fluid_api:
             with program_guard(Program(), Program()):
-            #for ci coverage
                 x1 = numpy.random.randn(2, 4).astype('int32')
-            x2 = fluid.layers.fill_constant(shape=[1], dtype='int32', value=1)
+                x2 = fluid.layers.fill_constant(
+                    shape=[1], dtype='int32', value=1)
                 x3 = numpy.random.randn(2, 4).astype('int32')
 
                 self.assertRaises(
                     TypeError, fluid.layers.array_read, array=x1, i=x2)
                 self.assertRaises(
                     TypeError, fluid.layers.array_write, array=x1, i=x2, out=x3)
+        else:
+            with program_guard(Program(), Program()):
+                x1 = numpy.random.randn(2, 4).astype('int32')
+                x2 = paddle.ones(shape=[1], dtype='int32')
+                x3 = numpy.random.randn(2, 4).astype('int32')
+
+                self.assertRaises(
+                    TypeError, paddle.tensor.array_read, array=x1, i=x2)
+                self.assertRaises(
+                    TypeError,
+                    paddle.tensor.array_write,
+                    array=x1,
+                    i=x2,
+                    out=x3)
+
+    def test_fluid_api(self):
+        self._test_errors(use_fluid_api=True)
+
+    def test_paddle_api(self):
+        self._test_errors(use_fluid_api=False)
+
+
+class TestArrayReadWriteApi(unittest.TestCase):
+    def test_api(self):
+        paddle.disable_static()
+        arr = paddle.tensor.create_array(dtype="float32")
+        x = paddle.full(shape=[1, 3], fill_value=5, dtype="float32")
+        i = paddle.zeros(shape=[1], dtype="int32")
+
+        arr = paddle.tensor.array_write(x, i, array=arr)
+
+        item = paddle.tensor.array_read(arr, i)
+
+        self.assertTrue(numpy.allclose(x.numpy(), item.numpy()))
+        paddle.enable_static()
 
 
 if __name__ == '__main__':

python/paddle/fluid/tests/unittests/test_lod_array_length_op.py

@@ -15,6 +15,8 @@
 from __future__ import print_function
 
 import unittest
+
+import paddle
 import paddle.fluid.layers as layers
 from paddle.fluid.executor import Executor
 import paddle.fluid.core as core
@@ -44,5 +46,20 @@ class TestLoDArrayLengthOpError(unittest.TestCase):
             self.assertRaises(TypeError, fluid.layers.array_length, array=x1)
 
 
+class TestArrayLengthApi(unittest.TestCase):
+    def test_api(self):
+        paddle.disable_static()
+
+        arr = paddle.tensor.create_array(dtype='float32')
+        x = paddle.full(shape=[3, 3], fill_value=5, dtype="float32")
+        i = paddle.zeros(shape=[1], dtype="int32")
+
+        arr = paddle.tensor.array_write(x, i, array=arr)
+
+        arr_len = paddle.tensor.array_length(arr)
+        self.assertEqual(arr_len, 1)
+        paddle.enable_static()
+
+
 if __name__ == '__main__':
     unittest.main()

python/paddle/tensor/__init__.py

@@ -202,3 +202,8 @@ from .stat import median  #DEFINE_ALIAS
 # from .tensor import LoDTensor        #DEFINE_ALIAS
 # from .tensor import LoDTensorArray        #DEFINE_ALIAS
 from .to_string import set_printoptions  #DEFINE_ALIAS
+
+from .array import array_length  #DEFINE_ALIAS
+from .array import array_read  #DEFINE_ALIAS
+from .array import array_write  #DEFINE_ALIAS
+from .array import create_array  #DEFINE_ALIAS

python/paddle/tensor/array.py

+#   Copyright (c) 2020 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.
+
+# Define functions about array.
+
+from ..fluid import layers
+
+
+def array_length(array):
+    """
+    This OP is used to get the length of the input array.
+
+    Args:
+        array (list|Tensor): The input array that will be used to compute the length. In dynamic mode, ``array`` is a Python list. But in static mode, array is a Tensor whose VarType is LOD_TENSOR_ARRAY.
+
+    Returns:
+        Tensor: 1-D Tensor with shape [1], which is the length of array.
+
+    Examples:
+        .. code-block:: python
+
+            import paddle
+
+            arr = paddle.tensor.create_array(dtype='float32')
+            x = paddle.full(shape=[3, 3], fill_value=5, dtype="float32")
+            i = paddle.zeros(shape=[1], dtype="int32")
+
+            arr = paddle.tensor.array_write(x, i, array=arr)
+
+            arr_len = paddle.tensor.array_length(arr)
+            print(arr_len)  # 1
+    """
+    return layers.array_length(array)
+
+
+def array_read(array, i):
+    """
+    This OP is used to read data at the specified position from the input array.
+
+    Case:
+
+    .. code-block:: text
+
+        Input:
+            The shape of first three tensors are [1], and that of the last one is [1,2]:
+                array = ([0.6], [0.1], [0.3], [0.4, 0.2])
+            And:
+                i = [3]
+
+        Output:
+            output = [0.4, 0.2]
+
+    Args:
+        array (list|Tensor): The input array. In dynamic mode, ``array`` is a Python list. But in static mode, array is a Tensor whose ``VarType`` is ``LOD_TENSOR_ARRAY``.
+        i (Tensor): 1-D Tensor, whose shape is [1] and dtype is int64. It represents the
+            specified read position of ``array``.
+
+    Returns:
+        Tensor: A Tensor that is read at the specified position of ``array``.
+
+    Examples:
+        .. code-block:: python
+
+            import paddle
+
+            arr = paddle.tensor.create_array(dtype="float32")
+            x = paddle.full(shape=[1, 3], fill_value=5, dtype="float32")
+            i = paddle.zeros(shape=[1], dtype="int32")
+
+            arr = paddle.tensor.array_write(x, i, array=arr)
+
+            item = paddle.tensor.array_read(arr, i)
+            print(item)     # [[5., 5., 5.]]
+    """
+    return layers.array_read(array, i)
+
+
+def array_write(x, i, array=None):
+    """
+    This OP writes the input ``x`` into the i-th position of the ``array`` returns the modified array.
+    If ``array`` is none, a new array will be created and returned.
+
+    Args:
+        x (Tensor): The input data to be written into array. It's multi-dimensional
+            Tensor or LoDTensor. Data type: float32, float64, int32, int64 and bool.
+        i (Tensor): 1-D Tensor with shape [1], which represents the position into which
+            ``x`` is written.
+        array (list|Tensor, optional): The array into which ``x`` is written. The default value is None,
+            when a new array will be created and returned as a result. In dynamic mode, ``array`` is a Python list.
+            But in static mode, array is a Tensor whose ``VarType`` is ``LOD_TENSOR_ARRAY``.
+
+    Returns:
+        list|Tensor: The input ``array`` after ``x`` is written into.
+
+    Examples:
+        .. code-block:: python
+
+            import paddle
+
+            arr = paddle.tensor.create_array(dtype="float32")
+            x = paddle.full(shape=[1, 3], fill_value=5, dtype="float32")
+            i = paddle.zeros(shape=[1], dtype="int32")
+
+            arr = paddle.tensor.array_write(x, i, array=arr)
+
+            item = paddle.tensor.array_read(arr, i)
+            print(item)     # [[5., 5., 5.]]
+    """
+    return layers.array_write(x, i, array)
+
+
+def create_array(dtype):
+    """
+    This OP creates an array. It is used as the input of :ref:`api_paddle_tensor_array_array_read` and
+    :ref:`api_paddle_tensor_array_array_write`.
+
+    Args:
+        dtype (str): The data type of the elements in the array. Support data type: float32, float64, int32, int64 and bool.
+
+    Returns:
+        list|Tensor: An empty array. In dynamic mode, ``array`` is a Python list. But in static mode, array is a Tensor
+        whose ``VarType`` is ``LOD_TENSOR_ARRAY``.
+
+    Examples:
+        .. code-block:: python
+
+            import paddle
+
+            arr = paddle.tensor.create_array(dtype="float32")
+            x = paddle.full(shape=[1, 3], fill_value=5, dtype="float32")
+            i = paddle.zeros(shape=[1], dtype="int32")
+
+            arr = paddle.tensor.array_write(x, i, array=arr)
+
+            item = paddle.tensor.array_read(arr, i)
+            print(item)     # [[5., 5., 5.]]
+
+    """
+    return layers.create_array(dtype)