add 0d tensor support for searchsorted for npu and mlu (PaddlePaddle#233)

* add ut for searchsorted for npu and mlu

* add value compare

Author: FeixLiu

backends/mlu/tests/unittests/test_zero_dim_tensor_mlu.py

@@ -426,6 +426,16 @@ def test_logical_not(self):
 
         self.assertEqual(out.shape, [])
 
+    def test_searchsorted(self):
+        x = paddle.to_tensor([1, 3, 5, 7, 9])
+        y = paddle.rand([])
+
+        # only has forward kernel
+        out = paddle.searchsorted(x, y)
+
+        self.assertEqual(out.shape, [])
+        self.assertEqual(out.numpy(), 0)
+
 
 # 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):

backends/npu/tests/unittests/test_zero_dim_tensor_npu.py

@@ -426,6 +426,16 @@ def test_logical_not(self):
 
         self.assertEqual(out.shape, [])
 
+    def test_searchsorted(self):
+        x = paddle.to_tensor([1, 3, 5, 7, 9])
+        y = paddle.rand([])
+
+        # only has forward kernel
+        out = paddle.searchsorted(x, y)
+
+        self.assertEqual(out.shape, [])
+        self.assertEqual(out.numpy(), 0)
+
 # 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):