lint fixes.

Author: Sergey Shtin

tests/python/relay/test_op_level1.py

@@ -527,15 +527,17 @@ def test_concatenate3(target, dev):
         t_shape = [3, 2, 2, ending]
         do_concat_test(shapes, t_shape, dtype, axis, dev, target)
 
+
 @tvm.testing.parametrize_targets("llvm")
 def test_concatenate4(target, dev):
     np.random.seed(7)
     x_shape = (2, 1)
-    x = relay.var("x", shape=x_shape, dtype='int64')
+    x = relay.var("x", shape=x_shape, dtype="int64")
     concat = relay.concatenate([x], axis=1)
     f = relay.Function([x], concat)
-    x_val = np.array([[33], [13]], dtype='int64')
-    op_res = relay.create_executor('graph', device=tvm.cpu(), target='llvm').evaluate(f)(x_val)
+    x_val = np.array([[33], [13]], dtype="int64")
+    graph = relay.create_executor("graph", device=tvm.cpu(), target="llvm")
+    op_res = graph.evaluate(f)(x_val)
     ref_res = np.concatenate([x_val], axis=1)
     tvm.testing.assert_allclose(op_res.numpy(), ref_res, rtol=0.000001)