modify meshgrid test=develop (#25319)

According to paddle 2.0 standard.
1, chang api to def meshgrid(*args, **kwargs) we hide name argument in **kwargs.
2, add relate ut.
3, change example code to imperative mode

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

@@ -79,7 +79,7 @@ class TestMeshgridOp3(unittest.TestCase):
         out_2 = np.broadcast_to(out_2, [100, 200])
 
         exe = fluid.Executor(place=fluid.CPUPlace())
-        grid_x, grid_y = paddle.tensor.meshgrid([x, y])
+        grid_x, grid_y = paddle.tensor.meshgrid(x, y)
         res_1, res_2 = exe.run(fluid.default_main_program(),
                                feed={'x': input_1,
                                      'y': input_2},
@@ -90,21 +90,72 @@ class TestMeshgridOp3(unittest.TestCase):
 
 
 class TestMeshgridOp4(unittest.TestCase):
-    def test_errors(self):
-        with program_guard(Program(), Program()):
+    def test_list_input(self):
+        x = fluid.data(shape=[100], dtype='int32', name='x')
+        y = fluid.data(shape=[200], dtype='int32', name='y')
 
-            def test_input_type():
-                x = fluid.data(shape=[200], dtype='float32', name='x2')
-                paddle.tensor.meshgrid(x)
+        input_1 = np.random.randint(0, 100, [100, ]).astype('int32')
+        input_2 = np.random.randint(0, 100, [200, ]).astype('int32')
 
-        self.assertRaises(TypeError, test_input_type)
+        out_1 = np.reshape(input_1, [100, 1])
+        out_1 = np.broadcast_to(out_1, [100, 200])
+        out_2 = np.reshape(input_2, [1, 200])
+        out_2 = np.broadcast_to(out_2, [100, 200])
+
+        exe = fluid.Executor(place=fluid.CPUPlace())
+        grid_x, grid_y = paddle.tensor.meshgrid([x, y])
+        res_1, res_2 = exe.run(fluid.default_main_program(),
+                               feed={'x': input_1,
+                                     'y': input_2},
+                               fetch_list=[grid_x, grid_y])
+
+        assert np.array_equal(res_1, out_1)
+        assert np.array_equal(res_2, out_2)
 
 
 class TestMeshgridOp5(unittest.TestCase):
+    def test_tuple_input(self):
+        x = fluid.data(shape=[100], dtype='int32', name='x')
+        y = fluid.data(shape=[200], dtype='int32', name='y')
+
+        input_1 = np.random.randint(0, 100, [100, ]).astype('int32')
+        input_2 = np.random.randint(0, 100, [200, ]).astype('int32')
+
+        out_1 = np.reshape(input_1, [100, 1])
+        out_1 = np.broadcast_to(out_1, [100, 200])
+        out_2 = np.reshape(input_2, [1, 200])
+        out_2 = np.broadcast_to(out_2, [100, 200])
+
+        exe = fluid.Executor(place=fluid.CPUPlace())
+        grid_x, grid_y = paddle.tensor.meshgrid((x, y))
+        res_1, res_2 = exe.run(fluid.default_main_program(),
+                               feed={'x': input_1,
+                                     'y': input_2},
+                               fetch_list=[grid_x, grid_y])
+
+        assert np.array_equal(res_1, out_1)
+        assert np.array_equal(res_2, out_2)
+
+
+class TestMeshgridOp6(unittest.TestCase):
     def test_api_with_dygraph(self):
         input_3 = np.random.randint(0, 100, [100, ]).astype('int32')
         input_4 = np.random.randint(0, 100, [200, ]).astype('int32')
 
+        with fluid.dygraph.guard():
+            tensor_3 = fluid.dygraph.to_variable(input_3)
+            tensor_4 = fluid.dygraph.to_variable(input_4)
+            res_3, res_4 = paddle.tensor.meshgrid(tensor_3, tensor_4)
+
+            assert np.array_equal(res_3.shape, [100, 200])
+            assert np.array_equal(res_4.shape, [100, 200])
+
+
+class TestMeshgridOp7(unittest.TestCase):
+    def test_api_with_dygraph_list_input(self):
+        input_3 = np.random.randint(0, 100, [100, ]).astype('int32')
+        input_4 = np.random.randint(0, 100, [200, ]).astype('int32')
+
         with fluid.dygraph.guard():
             tensor_3 = fluid.dygraph.to_variable(input_3)
             tensor_4 = fluid.dygraph.to_variable(input_4)
@@ -114,5 +165,19 @@ class TestMeshgridOp5(unittest.TestCase):
             assert np.array_equal(res_4.shape, [100, 200])
 
 
+class TestMeshgridOp7(unittest.TestCase):
+    def test_api_with_dygraph_tuple_input(self):
+        input_3 = np.random.randint(0, 100, [100, ]).astype('int32')
+        input_4 = np.random.randint(0, 100, [200, ]).astype('int32')
+
+        with fluid.dygraph.guard():
+            tensor_3 = fluid.dygraph.to_variable(input_3)
+            tensor_4 = fluid.dygraph.to_variable(input_4)
+            res_3, res_4 = paddle.tensor.meshgrid((tensor_3, tensor_4))
+
+            assert np.array_equal(res_3.shape, [100, 200])
+            assert np.array_equal(res_4.shape, [100, 200])
+
+
 if __name__ == '__main__':
     unittest.main()

python/paddle/tensor/creation.py

@@ -704,18 +704,19 @@ def triu(input, diagonal=0, name=None):
     return _tril_triu_op(LayerHelper('triu', **locals()))
 
 
-def meshgrid(input, name=None):
+def meshgrid(*args, **kwargs):
     """
 	:alias_main: paddle.meshgrid
 	:alias: paddle.meshgrid,paddle.tensor.meshgrid,paddle.tensor.creation.meshgrid
 
-    This op takes a list of N tensors as input, each of which is 1-dimensional 
+    This op takes a list of N tensors as input *args, each of which is 1-dimensional 
     vector, and creates N-dimensional grids.
     
     Args:
-        input(Variable) : tensors (list of tensor): the shapes of input k tensors are (N1,), 
+        *args(Variable|list of Variable) : tensors (tuple(list) of tensor): the shapes of input k tensors are (N1,), 
             (N2,),..., (Nk,). Support data types: ``float64``, ``float32``, ``int32``, ``int64``.
-        name (str, optional): The default value is None. Normally there is no need for
+        **kwargs (optional): Currently, we only accept name in **kwargs 
+            The default value is None. Normally there is no need for
             user to set this property. For more information, please refer to :ref:`api_guide_Name`.
  
     Returns:
@@ -735,7 +736,7 @@ def meshgrid(input, name=None):
           input_2 = np.random.randint(0, 100, [200, ]).astype('int32')
 
           exe = fluid.Executor(place=fluid.CPUPlace())
-          grid_x, grid_y = paddle.tensor.meshgrid([x, y])
+          grid_x, grid_y = paddle.tensor.meshgrid(x, y)
           res_1, res_2 = exe.run(fluid.default_main_program(),
                                  feed={'x': input_1,
                                        'y': input_2},
@@ -749,41 +750,45 @@ def meshgrid(input, name=None):
           #example 2: in dygraph mode
 
           import paddle
-          import paddle.fluid as fluid
           import numpy as np
           
+          paddle.enable_imperative()
+
           input_3 = np.random.randint(0, 100, [100, ]).astype('int32')
           input_4 = np.random.randint(0, 100, [200, ]).astype('int32')
-          with fluid.dygraph.guard():
-              tensor_3 = fluid.dygraph.to_variable(input_3)
-              tensor_4 = fluid.dygraph.to_variable(input_4)
-              grid_x, grid_y = paddle.tensor.meshgrid([tensor_3, tensor_4])
+          tensor_3 = paddle.imperative.to_variable(input_3)
+          tensor_4 = paddle.imperative.to_variable(input_4)
+          grid_x, grid_y = paddle.tensor.meshgrid(tensor_3, tensor_4)
 
           #the shape of grid_x is (100, 200)
           #the shape of grid_y is (100, 200)
 
     """
 
+    if len(args) == 1 and isinstance(args[0], (list, tuple)):
+        args = args[0]
     if in_dygraph_mode():
-        num = len(input)
-        out = core.ops.meshgrid(input, num)
+        num = len(args)
+        out = core.ops.meshgrid(list(args), num)
         return out
 
+    name = kwargs.get("name", None)
     helper = LayerHelper('meshgrid', **locals())
 
-    if not isinstance(input, list):
-        raise TypeError("The type of input in meshgrid should be list.")
+    if not isinstance(args, (list, tuple)):
+        raise TypeError("The type of input args in meshgrid should be list.")
 
-    for id, input_ in enumerate(input):
+    for id, input_ in enumerate(args):
         check_dtype(input_.dtype, 'create data type',
                     ['float16', 'float32', 'float64', 'int32', 'int64'],
                     'meshgrid')
 
-    num = len(input)
+    num = len(args)
     out = [
-        helper.create_variable_for_type_inference(dtype=input[i].dtype)
+        helper.create_variable_for_type_inference(dtype=args[i].dtype)
         for i in range(num)
     ]
-    helper.append_op(type='meshgrid', inputs={'X': input}, outputs={'Out': out})
+    helper.append_op(
+        type='meshgrid', inputs={'X': list(args)}, outputs={'Out': out})
 
     return out