Delete inverse out (#25925)

* test=develop,test=document_fix, remove the out args

* delete out in inverse

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

@@ -142,14 +142,10 @@ class TestInverseSingularAPI(unittest.TestCase):
         if core.is_compiled_with_cuda():
             self.places.append(fluid.CUDAPlace(0))
 
-    def check_static_result(self, place, with_out=False):
+    def check_static_result(self, place):
         with fluid.program_guard(fluid.Program(), fluid.Program()):
             input = fluid.data(name="input", shape=[4, 4], dtype="float64")
-            if with_out:
-                out = fluid.data(name="output", shape=[4, 4], dtype="float64")
-            else:
-                out = None
-            result = paddle.inverse(input=input, out=out)
+            result = paddle.inverse(input=input)
 
             input_np = np.zeros([4, 4]).astype("float64")