!25718 optimize implicit convert error message

Merge pull request !25718 from chujinjin/optimize_implicit_convert_error_msg

mindspore/ccsrc/pipeline/pynative/pynative_execute.cc

@@ -1271,10 +1271,10 @@ void ForwardExecutor::DoSignatrueCast(const PrimitivePyPtr &prim,
     }
 
     if (!py::isinstance<tensor::Tensor>(obj) && !py::isinstance<py::int_>(obj) && !py::isinstance<py::float_>(obj)) {
-      MS_EXCEPTION(TypeError) << "For '" << prim->name() << "', the " << i
-                              << "th input is a not support implicit conversion type: "
-                              << py::cast<std::string>(obj.attr("__class__").attr("__name__")) << ", and the value is "
-                              << py::cast<py::str>(obj) << ".";
+      MS_EXCEPTION(TypeError) << "For '" << prim->name() << "', the " << i << "th input " << signature[i].name
+                              << " is a not support implicit conversion. "
+                              << "Its type is " << py::cast<std::string>(obj.attr("__class__").attr("__name__"))
+                              << ", and the value is " << py::cast<py::str>(obj) << ". Only support Tensor or Scalar.";
     }
     py::object cast_output = DoAutoCast(input_args[i], it->second, op_exec_info->op_name, i);
     input_args[i] = cast_output;

tests/ut/python/pynative_mode/test_implicit_conversion.py

@@ -111,7 +111,7 @@ def test_float_tensor_and_str_add():
     y = "ok"
     with pytest.raises(TypeError) as er:
         ret = x + y
-    assert "For 'Add', the 1th input is a not support implicit conversion type: str" in str(er.value)
+    assert "For 'Add', the 1th input var is a not support implicit conversion. Its type is" in str(er.value)
 
 
 def test_float_tensor_and_tuple_add():