Hi @Vasiliy_Kuznetsov, sorry for my late reply and thank you for your answer!
I understood why I can’t convert mobilenetv2.
I was able to convert the MobileNetV2 which you referred me to.
Also, based on the implementation of a quantizeable model, I modified the model of original MobileNetv2 as follows and was able to convert it!!!
    def forward(self, x):
        if self.use_res_connect:
            # return x + self.conv(x)
            return self.skip_add.add(x, self.conv(x))
        else:
            return self.conv(x)

Unfortunately, the accuracy of both methods is very bad.
However, thanks to you, I was able to quantize it.
Thank you very much!!!