diff --git a/python/tvm/autotvm/task/space.py b/python/tvm/autotvm/task/space.py
index 378aaa387c43..49376613992f 100644
--- a/python/tvm/autotvm/task/space.py
+++ b/python/tvm/autotvm/task/space.py
@@ -33,6 +33,7 @@
 import numpy as np
 
 from tvm.te import schedule, thread_axis
+from tvm.tir import expr
 from tvm.autotvm.util import get_const_int
 
 Axis = namedtuple('Axis', ['space', 'index'])
@@ -736,9 +737,9 @@ def add_flop(self, flop):
         flop: int or float or IntImm or FloatImm
             number of float operations
         """
-        if not isinstance(flop, (int, float)):
+        if isinstance(flop, (expr.IntImm, expr.FloatImm)):
             flop = flop.value
-        self.flop += flop
+        self.flop += float(flop)
 
     def raise_error(self, msg):
         """register error in config
diff --git a/topi/python/topi/cuda/conv2d.py b/topi/python/topi/cuda/conv2d.py
index 5b84a424eac0..973c21642757 100644
--- a/topi/python/topi/cuda/conv2d.py
+++ b/topi/python/topi/cuda/conv2d.py
@@ -111,7 +111,7 @@ def conv2d_cudnn(cfg, data, kernel, strides, padding, dilation, groups=1,
                               [dilation_h, dilation_w],
                               conv_mode=1,
                               tensor_format=tensor_format,
-                              algo=cfg['algo'],
+                              algo=cfg['algo'].val,
                               conv_dtype=dtype,
                               groups=groups)