diff --git a/paddle/fluid/pybind/pybind.cc b/paddle/fluid/pybind/pybind.cc
index dc380f83bf71beb3cd935567c0f8c10af091d56e..d5ee0c2a47b00224a0eecbbd8a229ed3b9327afa 100644
--- a/paddle/fluid/pybind/pybind.cc
+++ b/paddle/fluid/pybind/pybind.cc
@@ -1921,7 +1921,7 @@ All parameter, weight, gradient are variables in Paddle.
              Prune the backward part of a program, mostly called in
              program.clone(for_test=True).
               
-             Args:
+            Args:
                    program (ProgramDesc): The original program.
 
              Returns:
@@ -1930,6 +1930,17 @@ All parameter, weight, gradient are variables in Paddle.
                    which contains the id pair of pruned block and corresponding
                    origin block.
            )DOC");
+  m.def("get_readable_comile_key", [](const OpDesc &op_desc) {
+    auto compilation_key =
+        BOOST_GET_CONST(std::string, op_desc.GetAttr("compilation_key"));
+    VLOG(4) << std::hash<std::string>{}(compilation_key) << " "
+            << compilation_key.size();
+    proto::ProgramDesc desc;
+    desc.ParseFromString(compilation_key);
+    auto s = desc.DebugString();
+    VLOG(4) << s;
+    return s;
+  });
   m.def("empty_var_name",
         []() { return std::string(framework::kEmptyVarName); });
   m.def("grad_var_suffix",
diff --git a/paddle/fluid/pybind/pybind_boost_headers.h b/paddle/fluid/pybind/pybind_boost_headers.h
index 3eb4db175a745c8ea7a3afaff919e4f21d430a8b..be9333eb7361b429966250639a18762aeaf2e249 100644
--- a/paddle/fluid/pybind/pybind_boost_headers.h
+++ b/paddle/fluid/pybind/pybind_boost_headers.h
@@ -45,10 +45,28 @@ struct PYBIND11_HIDDEN paddle_variant_caster_visitor
   paddle_variant_caster_visitor(return_value_policy policy, handle parent)
       : policy(policy), parent(parent) {}
 
-  template <class T>
-  handle operator()(T const &src) const {
+  template <class T,
+            typename std::enable_if<!std::is_same<T, std::string>::value,
+                                    bool>::type* = nullptr>
+  handle operator()(T const& src) const {
     return make_caster<T>::cast(src, policy, parent);
   }
+
+  template <class T,
+            typename std::enable_if<std::is_same<T, std::string>::value,
+                                    bool>::type* = nullptr>
+  handle operator()(T const& src) const {
+    try {
+      return make_caster<T>::cast(src, policy, parent);
+    } catch (std::exception& ex) {
+      VLOG(4) << ex.what();
+      VLOG(4) << src;
+      // UnicodeDecodeError, src is not utf-8 encoded
+      // see details:
+      // https://github.com/pybind/pybind11/blob/master/docs/advanced/cast/strings.rst
+      return PYBIND11_BYTES_FROM_STRING_AND_SIZE(src.data(), src.size());
+    }
+  }
 };
 
 template <class Variant>
@@ -105,7 +123,7 @@ struct paddle_variant_caster<V<Ts...>> {
     return load_success_;
   }
 
-  static handle cast(Type const &src, return_value_policy policy,
+  static handle cast(Type const& src, return_value_policy policy,
                      handle parent) {
     paddle_variant_caster_visitor visitor(policy, parent);
     return boost::apply_visitor(visitor, src);
diff --git a/python/paddle/fluid/framework.py b/python/paddle/fluid/framework.py
index 817e742fd1d8a5146a67464f326f007e91d04040..16a5e254725576746995c22defc6f028a676563c 100644
--- a/python/paddle/fluid/framework.py
+++ b/python/paddle/fluid/framework.py
@@ -2863,8 +2863,22 @@ class Operator(object):
                     attrs_str += ", "
                 continue
 
+            # it is bytes of serialized protobuf 
+            if self.type == 'cinn_launch' and name == 'compilation_key':
+                # value = core.get_readable_comile_key(self.desc)
+                v = self.desc.attr(name)
+                prog = Program()
+                prog = prog.parse_from_string(v)
+                s = prog._to_readable_code()
+                lines = s.split('\n')
+                value = '\n'.join(['      ' + line for line in lines])
+                value = '\n' + value
+            else:
+                value = self.desc.attr(name)
+
             a = "{name} = {value}".format(
-                name=name, type=attr_type, value=self.desc.attr(name))
+                name=name, type=attr_type, value=value)
+
             attrs_str += a
             if i != len(attr_names) - 1:
                 attrs_str += ", "