Fix (#73191)

co63oc · web-flow · commit 1202c7bfa474 · 2025-06-13T14:54:25.000+08:00
diff --git a/test/legacy_test/test_nn_margin_rank_loss.py b/test/legacy_test/test_nn_margin_rank_loss.py
@@ -198,6 +198,77 @@ def test_case(self):
         create_test_case(margin, reduction)
 
 
+def create_test_case_zero_size(margin, reduction):
+    class MarginRankingLossCls_ZeroSize(unittest.TestCase):
+        def init_shape(self):
+            self.x_shape = (1, 10)
+            self.y_shape = (0, 10)
+            self.label_shape = (1, 10)
+
+        def setUp(self):
+            self.init_shape()
+            self.x_data = np.random.rand(*self.x_shape).astype("float64")
+            self.y_data = np.random.rand(*self.y_shape).astype("float64")
+            self.label_data = np.random.choice(
+                [-1, 1], size=self.label_shape
+            ).astype("float64")
+            self.places = []
+            if (
+                os.environ.get('FLAGS_CI_both_cpu_and_gpu', 'False').lower()
+                in ['1', 'true', 'on']
+                or not core.is_compiled_with_cuda()
+            ):
+                self.places.append(base.CPUPlace())
+            if core.is_compiled_with_cuda():
+                self.places.append(paddle.CUDAPlace(0))
+
+        def run_dynamic_functional_api(self, place):
+            paddle.disable_static(place)
+            x = paddle.to_tensor(self.x_data)
+            x.stop_gradient = False
+            y = paddle.to_tensor(self.y_data)
+            label = paddle.to_tensor(self.label_data)
+
+            result = paddle.nn.functional.margin_ranking_loss(
+                x, y, label, margin, reduction
+            )
+            expected = calc_margin_rank_loss(
+                self.x_data,
+                self.y_data,
+                self.label_data,
+                margin=margin,
+                reduction=reduction,
+            )
+            np.testing.assert_allclose(result.numpy(), expected, rtol=1e-05)
+            loss = paddle.sum(result)
+            loss.backward()
+            np.testing.assert_allclose(x.grad.shape, x.shape)
+            paddle.enable_static()
+
+        def test_case(self):
+            for place in self.places:
+                self.run_dynamic_functional_api(place)
+
+    cls_name = f"TestMarginRankLossCase_ZeroSize_{margin}_{reduction}"
+    MarginRankingLossCls_ZeroSize.__name__ = cls_name
+    globals()[cls_name] = MarginRankingLossCls_ZeroSize
+
+    class MarginRankingLossCls_ZeroSize2(MarginRankingLossCls_ZeroSize):
+        def init_shape(self):
+            self.x_shape = (0, 10)
+            self.y_shape = (0, 10)
+            self.label_shape = (0, 10)
+
+    cls_name = f"TestMarginRankLossCase_ZeroSize2_{margin}_{reduction}"
+    MarginRankingLossCls_ZeroSize2.__name__ = cls_name
+    globals()[cls_name] = MarginRankingLossCls_ZeroSize2
+
+
+for margin in [0.0, 0.2]:
+    for reduction in ['none', 'mean', 'sum']:
+        create_test_case_zero_size(margin, reduction)
+
+
 # test case the raise message
 class MarginRakingLossError(unittest.TestCase):
     paddle.enable_static()
