Fix (#73173)

co63oc · web-flow · commit a39921790805 · 2025-06-17T12:07:18.000+08:00
diff --git a/paddle/phi/kernels/impl/kldiv_loss_grad_kernel_impl.h b/paddle/phi/kernels/impl/kldiv_loss_grad_kernel_impl.h
@@ -48,6 +48,11 @@ void KLDivLossGradKernel(const Context& dev_ctx,
                          const std::string& reduction,
                          bool log_target,
                          DenseTensor* d_x) {
+  if (d_x->numel() == 0) {
+    dev_ctx.template Alloc<T>(d_x);
+    return;
+  }
+
   auto& place = *dev_ctx.eigen_device();
   auto* target = &label;
   auto* input_grad = d_x;
diff --git a/paddle/phi/kernels/impl/kldiv_loss_kernel_impl.h b/paddle/phi/kernels/impl/kldiv_loss_kernel_impl.h
@@ -18,8 +18,8 @@
 #include "paddle/common/hostdevice.h"
 #include "paddle/phi/backends/cpu/cpu_context.h"
 #include "paddle/phi/core/dense_tensor.h"
+#include "paddle/phi/kernels/full_kernel.h"
 #include "paddle/phi/kernels/funcs/eigen/common.h"
-
 namespace phi {
 using Array1 = Eigen::DSizes<int64_t, 1>;
 template <typename T>
@@ -48,6 +48,11 @@ void KLDivLossKernel(const Context& dev_ctx,
                      const std::string& reduction,
                      bool log_target,
                      DenseTensor* out) {
+  if (x.numel() == 0) {
+    phi::Full<T, Context>(
+        dev_ctx, phi::IntArray(common::vectorize(out->dims())), NAN, out);
+    return;
+  }
   auto& place = *(dev_ctx.eigen_device());
   auto* input = &x;
   auto* target = &label;
diff --git a/paddle/phi/kernels/xpu/kldiv_loss_kernel.cc b/paddle/phi/kernels/xpu/kldiv_loss_kernel.cc
@@ -15,8 +15,8 @@ limitations under the License. */
 #include "paddle/phi/backends/xpu/enforce_xpu.h"
 #include "paddle/phi/core/enforce.h"
 #include "paddle/phi/core/kernel_registry.h"
+#include "paddle/phi/kernels/full_kernel.h"
 #include "paddle/phi/kernels/softmax_kernel.h"
-
 namespace phi {
 
 template <typename T, typename Context>
@@ -31,6 +31,11 @@ void KLDivLossKernel(const Context& dev_ctx,
   if (out->numel() == 0) {
     return;
   }
+  if (x.numel() == 0) {
+    phi::Full<T, Context>(
+        dev_ctx, phi::IntArray(common::vectorize(out->dims())), NAN, out);
+    return;
+  }
 
   int r = 0;
 
diff --git a/test/legacy_test/test_hinge_embedding_loss.py b/test/legacy_test/test_hinge_embedding_loss.py
@@ -201,5 +201,44 @@ def test_value_error():
         self.assertRaises(ValueError, test_value_error)
 
 
+class TestFunctionalHingeEmbeddingLoss_ZeroSize(unittest.TestCase):
+    def setUp(self):
+        self.margin = 1.0
+        self.shape = (0, 10, 5)  # zero size
+        self.input_np = np.random.random(size=self.shape).astype(np.float64)
+        self.label_np = 2 * np.random.randint(0, 2, size=self.shape) - 1.0
+
+    def run_dynamic_check(self, place=paddle.CPUPlace()):
+        paddle.disable_static(place=place)
+        input = paddle.to_tensor(self.input_np)
+        input.stop_gradient = False
+        label = paddle.to_tensor(self.label_np, dtype="float64")
+
+        dy_result = paddle.nn.functional.hinge_embedding_loss(input, label)
+        expected = calc_hinge_embedding_loss(self.input_np, self.label_np)
+        np.testing.assert_allclose(dy_result.numpy(), expected, rtol=1e-05)
+        self.assertEqual(dy_result.shape, [])
+
+        dy_result = paddle.nn.functional.hinge_embedding_loss(
+            input, label, reduction='none'
+        )
+        expected = calc_hinge_embedding_loss(
+            self.input_np, self.label_np, reduction='none'
+        )
+        np.testing.assert_allclose(dy_result.numpy(), expected, rtol=1e-05)
+
+        loss = paddle.sum(dy_result)
+        loss.backward()
+        self.assertEqual(input.grad.shape, input.shape)
+
+    def test_cpu(self):
+        self.run_dynamic_check(place=paddle.CPUPlace())
+
+    def test_gpu(self):
+        if not paddle.is_compiled_with_cuda():
+            return
+        self.run_dynamic_check(place=paddle.CUDAPlace(0))
+
+
 if __name__ == "__main__":
     unittest.main()
diff --git a/test/legacy_test/test_kldiv_loss_op.py b/test/legacy_test/test_kldiv_loss_op.py
@@ -115,6 +115,52 @@ def initTestCase(self):
         self.log_target = True
 
 
+class TestKLDivLossOp_ZeroSize1(TestKLDivLossOp):
+    def setUp(self):
+        self.initTestCase()
+        self.op_type = 'kldiv_loss'
+        self.python_api = kl_div
+        self.public_python_api = paddle.nn.functional.kl_div
+        x = np.random.uniform(-10, 10, self.x_shape).astype('float64')
+        target = np.random.uniform(-10, 10, self.x_shape).astype('float64')
+
+        self.attrs = {
+            "reduction": self.reduction,
+            "log_target": self.log_target,
+        }
+
+        self.inputs = {
+            'X': x,
+            'Target': target,
+        }
+        loss = kldiv_loss(x, target, self.reduction, self.log_target)
+        self.outputs = {'Loss': loss.astype('float64')}
+
+    def initTestCase(self):
+        # return NAN
+        self.x_shape = (0, 2, 7, 7)
+        self.reduction = 'mean'
+        self.log_target = False
+
+    def test_check_output(self):
+        self.check_output(check_pir=True, equal_nan=True)
+
+    def test_check_grad(self):
+        self.check_grad(
+            ['X'],
+            'Loss',
+            no_grad_set={"Target"},
+            check_pir=True,
+        )
+
+
+class TestKLDivLossOp_ZeroSize2(TestKLDivLossOp_ZeroSize1):
+    def initTestCase(self):
+        self.x_shape = (0, 2, 7, 7)
+        self.reduction = 'none'
+        self.log_target = False
+
+
 class TestKLDivLossDygraph(unittest.TestCase):
     def run_kl_loss(self, reduction, shape=(5, 20), log_target=False):
         x = np.random.uniform(-10, 10, shape).astype('float64')
diff --git a/test/legacy_test/test_l1_loss.py b/test/legacy_test/test_l1_loss.py
@@ -201,6 +201,44 @@ def test_value_error():
         self.assertRaises(ValueError, test_value_error)
 
 
+class TestClassL1Loss_ZeroSize(unittest.TestCase):
+    def setUp(self):
+        self.input_np = np.random.random(size=(0, 10, 5)).astype(np.float32)
+        self.label_np = np.random.random(size=(0, 10, 5)).astype(np.float32)
+
+    def run_imperative(self):
+        input = paddle.to_tensor(self.input_np)
+        label = paddle.to_tensor(self.label_np)
+        input.stop_gradient = False
+        l1_loss = paddle.nn.loss.L1Loss()
+        dy_result = l1_loss(input, label)
+        expected = np.mean(np.abs(self.input_np - self.label_np))
+        np.testing.assert_allclose(dy_result.numpy(), expected, rtol=1e-05)
+        self.assertEqual(dy_result.shape, [])
+
+        l1_loss = paddle.nn.loss.L1Loss(reduction='sum')
+        dy_result = l1_loss(input, label)
+        expected = np.sum(np.abs(self.input_np - self.label_np))
+        np.testing.assert_allclose(dy_result.numpy(), expected, rtol=1e-05)
+        self.assertEqual(dy_result.shape, [])
+
+        loss = paddle.sum(dy_result)
+        loss.backward()
+        np.testing.assert_allclose(input.grad.shape, input.shape)
+
+    def test_cpu(self):
+        paddle.disable_static(place=paddle.base.CPUPlace())
+        self.run_imperative()
+        paddle.enable_static()
+
+    def test_gpu(self):
+        if not base.core.is_compiled_with_cuda():
+            return
+        paddle.disable_static(place=paddle.base.CUDAPlace(0))
+        self.run_imperative()
+        paddle.enable_static()
+
+
 if __name__ == "__main__":
     paddle.enable_static()
     unittest.main()
