调试 relay 遇到 __init_by_constructor__ 直接退出

[hxf0223]

为了学习TVM，按官方例子tvm/relay 写了个 Relay例子 relay00_graph.py。
首先，TVM编译时已经使用 -DCMAKE_BUILD_TYPE=Debug，并且 config.cmake中 set(USE_RELAY_DEBUG ON)。

使用的调试环境是 vscode /remote SSH，launch.json内容为：

{
    "version": "0.2.0",
    "configurations": [
        {
            "env": {
                "LD_LIBRARY_PATH": "${env:HOME}/work/tvm/build:${env:LD_LIBRARY_PATH}",
                "PYTHONPATH": "${env:HOME}/work/tvm/python:${env:PYTHONPATH}",
            },
            "python": "${userHome}/anaconda3/bin/python",
            "name": "Python: Current File",
            "type": "python",
            "request": "launch",
            "program": "${file}",
            "console": "integratedTerminal",
            "justMyCode": true
        }
    ]
}

几行简单的python代码如下：

from tvm import relay
import tvm.relay.op

x = relay.var("x")
v1 = relay.log(x)
v2 = relay.add(v1, v1)
func = relay.Function([x], v2)

在 x = relay.var("x") 这一行加上了一个断点，启动python文件调试并在这个断点位置使用F11一层一层跟进去（希望最终能跟进到TVM代码）。
在进入到 tvm/python/tvm/_ffi/_ctypes/object.py 中的 ObjectBase.__init_handle_by_constructor__之后：

def __init_handle_by_constructor__(self, fconstructor, *args):
        """Initialize the handle by calling constructor function.

        Parameters
        ----------
        fconstructor : Function
            Constructor function.

        args: list of objects
            The arguments to the constructor

        Note
        ----
        We have a special calling convention to call constructor functions.
        So the return handle is directly set into the Node object
        instead of creating a new Node.
        """
        # assign handle first to avoid error raising
        # pylint: disable=not-callable
        self.handle = None
        handle = __init_by_constructor__(fconstructor, args)
        if not isinstance(handle, ObjectHandle):
            handle = ObjectHandle(handle)
        self.handle = handle

单步到 handle = init_by_constructor(fconstructor, args) 就直接退出了，终端以及调试控制台都没有任何异常消息输出。
请问该如何处理这个问题呢？