The type inference pass was unable to infere a type for the expressation

Hello, I am working on a project on TVM where I have encountered a problems with some inference error while executing the code. The code I have developed is for a csv dataset . I have used the deploy classification in the tutorials as an example to develop my code for a csv dataset where i have encountered a problem while building the inference graph executor. I checked many examples in the tvm where most of them are programmed for the image dataset type. If you have any furthur csv type datasets please refer. I have pasted the code and its respective error. Any suggestions would be really helpful. Thanks in advance.