[Divide by 0 Error] add normalize check (#49977)

* [Divide by 0 Error] add normalize check

* [Divide by 0 Error] normalize check migrate to c++

Author: gouzil

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

@@ -97,6 +97,18 @@ def test_gpu(self):
         with fluid.program_guard(fluid.Program()):
             self.run_static(use_gpu=True)
 
+    def test_errors(self):
+        with fluid.dygraph.guard():
+            # The size of input in Normalize should not be 0.
+            def test_0_size():
+                array = np.array([], dtype=np.float32)
+                x = paddle.to_tensor(
+                    np.reshape(array, [1, 1, 0]), dtype='float32'
+                )
+                paddle.nn.functional.normalize(x)
+
+            self.assertRaises(ValueError, test_0_size)
+
 
 if __name__ == "__main__":
     unittest.main()

python/paddle/nn/functional/norm.py

@@ -77,6 +77,7 @@ def normalize(x, p=2, axis=1, epsilon=1e-12, name=None):
             #        [[0.        , 0.24253564, 0.37139067],
             #         [1.        , 0.97014254, 0.92847669]])
     """
+
     if in_dygraph_mode():
         eps = fluid.dygraph.base.to_variable([epsilon], dtype=x.dtype)
         out = _C_ops.p_norm(x, float(p), axis, epsilon, True, False)