Having the fp16 pragmas enabled in the header file is risky. The macros
defined by that header don't (and can't) include the pragmas that make
fp16 types themselves legal, and another header may disable the fp16
pragma before the macro's use.
The safest thing to do is the use of pragmas surrounding each use of the
macro in the implementation files. This pattern is also far more common
across the codebase.
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