Fix random crop op problem

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

@@ -21,7 +21,7 @@ from op_test import OpTest
 class TestRandomCropOp(OpTest):
     def setUp(self):
         to_crop = np.array([[[1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 12]]] *
-                           5).astype("float32")
+                           5).astype(np.int32)
         self.possible_res = [
             np.array([[1, 2, 3], [5, 6, 7]]), np.array([[2, 3, 4], [6, 7, 8]]),
             np.array([[5, 6, 7], [9, 10, 11]]),