Keep strided_slice op behavior consistent with slice op when starts input is...

Keep strided_slice op behavior consistent with slice op when starts input is less than -rank (#39066)

paddle/fluid/operators/strided_slice_op.h

@@ -121,6 +121,7 @@ static void StridedSliceFunctor(int64_t* starts, int64_t* ends,
     // stride must not be zero
     if (starts[axis_index] < 0) {
       starts[axis_index] = starts[axis_index] + axis_size;
+      starts[axis_index] = std::max<int64_t>(starts[axis_index], 0);
     }
     if (ends[axis_index] < 0) {
       if (!(ends[axis_index] == -1 &&
@@ -139,11 +140,6 @@ static void StridedSliceFunctor(int64_t* starts, int64_t* ends,
       }
     }
 
-    if ((starts[axis_index] < 0) && (axis_size > 0)) {
-      starts[axis_index] += axis_size;
-      starts[axis_index] = std::max<int64_t>(starts[axis_index], 0);
-    }
-
     if (strides[axis_index] < 0) {
       reverse_axis[axis_index] = 1;
       strides[axis_index] = -strides[axis_index];

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

@@ -216,6 +216,16 @@ class TestStrideSliceOp13(TestStrideSliceOp):
         self.infer_flags = [1, 1, 1, 1, 1]
 
 
+class TestStrideSliceOp14(TestStrideSliceOp):
+    def initTestCase(self):
+        self.input = np.random.rand(4, 4, 4, 4)
+        self.axes = [1, 2, 3]
+        self.starts = [-5, 0, -7]
+        self.ends = [-1, 2, 4]
+        self.strides = [1, 1, 1]
+        self.infer_flags = [1, 1, 1]
+
+
 class TestStrideSliceOpBool(TestStrideSliceOp):
     def test_check_grad(self):
         pass