I have been using the template of IJICAI and NeurIPS before, but when I moved the content to the latex template of spring nature today, there was a format error:

Getting the error “Missing $ inserted” in LaTeX

source:

 

 

recompile:

 

 After inspection, it was found that there was a problem with the representation of the absolute value symbol “|”:

 When using \vert instead of “|” for absolute values:

 

 

recomplie:

 

 This method has been proven to be effective.