[Zero-Dim] add where, atan2, median 0-Dim ut (#49692)

* add where, atan2, median 0d ut

* add where, atan2, median 0d ut

* update

* update

* update

paddle/phi/kernels/xpu/where_kernel.cc

@@ -43,6 +43,7 @@ void WhereKernel(const Context& ctx,
 
   int ret = xpu::select(
       ctx.x_context(), cond_data, x_data, y_data, out_data, cond_dims, x_dims);
+
   PADDLE_ENFORCE_XDNN_SUCCESS(ret, "select");
 }
 

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

@@ -87,6 +87,7 @@ unary_api_list = [
     paddle.lgamma,
     paddle.poisson,
     paddle.bernoulli,
+    paddle.median,
 ]
 
 inplace_api_list = [
@@ -1146,6 +1147,36 @@ class TestSundryAPI(unittest.TestCase):
         y = paddle.full([], 0.6)
         self.assertFalse(paddle.allclose(x, y))
 
+    def test_where(self):
+        x1 = paddle.full([], 1)
+        x2 = paddle.full([], 2)
+        x1.stop_gradient = False
+        x2.stop_gradient = False
+        out = paddle.where(x1 > x2, x1, x2)
+        out.backward()
+        self.assertEqual(out.shape, [])
+        self.assertEqual(out.numpy(), 2)
+        self.assertEqual(out.grad.shape, [])
+        self.assertEqual(x1.grad.shape, [])
+        self.assertEqual(x2.grad.shape, [])
+        self.assertEqual(x1.grad.numpy(), 0)
+        self.assertEqual(x2.grad.numpy(), 1)
+
+    def test_atan2(self):
+        x1 = paddle.full([], 0)
+        x2 = paddle.full([], 2)
+        x1.stop_gradient = False
+        x2.stop_gradient = False
+        out = paddle.atan2(x1, x2)
+        out.backward()
+        self.assertEqual(out.shape, [])
+        self.assertEqual(out.numpy(), 0)
+        self.assertEqual(out.grad.shape, [])
+        self.assertEqual(x1.grad.shape, [])
+        self.assertEqual(x2.grad.shape, [])
+        self.assertEqual(x1.grad.numpy(), 0.5)
+        self.assertEqual(x2.grad.numpy(), 0)
+
 
 class TestSundryAPIStatic(unittest.TestCase):
     def setUp(self):
@@ -1785,6 +1816,45 @@ class TestSundryAPIStatic(unittest.TestCase):
         self.assertEqual(res[4].shape, (2,))
         self.assertEqual(res[5].shape, (3,))
 
+    @prog_scope()
+    def test_where(self):
+        x1 = paddle.full([], 1, 'float32')
+        x2 = paddle.full([], 2, 'float32')
+        x1.stop_gradient = False
+        x2.stop_gradient = False
+        out = paddle.where(x1 > x2, x1, x2)
+        loss = paddle.mean(out)
+        paddle.static.append_backward(loss)
+
+        prog = paddle.static.default_main_program()
+        res = self.exe.run(
+            prog,
+            feed={},
+            fetch_list=[out, out.grad_name, x1.grad_name, x2.grad_name],
+        )
+
+        self.assertEqual(res[0].shape, ())
+        self.assertEqual(res[0], 2)
+        self.assertEqual(res[1].shape, ())
+        self.assertEqual(res[2].shape, ())
+        self.assertEqual(res[2], 0)
+        self.assertEqual(res[3].shape, ())
+        self.assertEqual(res[3], 1)
+
+    @prog_scope()
+    def test_atan2(self):
+        x1 = paddle.full([], 0, 'float32')
+        x2 = paddle.full([], 2, 'float32')
+        x1.stop_gradient = False
+        x2.stop_gradient = False
+        out = paddle.atan2(x1, x2)
+        paddle.static.append_backward(out)
+
+        prog = paddle.static.default_main_program()
+        res = self.exe.run(prog, feed={}, fetch_list=[out])
+
+        self.assertEqual(res[0].shape, ())
+
 
 # Use to test API whose zero-dim input tensors don't have grad and not need to test backward in OpTest.
 class TestNoBackwardAPI(unittest.TestCase):

python/paddle/fluid/tests/unittests/xpu/test_zero_dim_tensor_xpu.py

@@ -87,6 +87,7 @@ unary_api_list = [
     paddle.lgamma,
     paddle.poisson,
     paddle.bernoulli,
+    paddle.median,
 ]
 
 inplace_api_list = [
@@ -759,6 +760,8 @@ class TestSundryAPI(unittest.TestCase):
 
 
 # Use to test API whose zero-dim input tensors don't have grad and not need to test backward in OpTest.
+
+
 class TestNoBackwardAPI(unittest.TestCase):
     def setUp(self):
         paddle.disable_static()
@@ -905,6 +908,13 @@ class TestNoBackwardAPI(unittest.TestCase):
         self.assertEqual(one_hot_label.shape, [4])
         self.assertEqual(one_hot_label.numpy()[2], 1)
 
+    def test_where(self):
+        x1 = paddle.full([], 1)
+        x2 = paddle.full([], 2)
+        out = paddle.where(x1 > x2, x1, x2)
+        self.assertEqual(out.shape, [])
+        self.assertEqual(out.numpy(), 2)
+
 
 if __name__ == "__main__":
     unittest.main()

python/paddle/tensor/stat.py

@@ -404,6 +404,10 @@ def median(x, axis=None, keepdim=False, name=None):
     """
     if not isinstance(x, Variable):
         raise TypeError("In median, the input x should be a Tensor.")
+
+    if len(x.shape) == 0:
+        return x.clone()
+
     is_flatten = axis is None
     dims = len(x.shape)
     if is_flatten: