What is the difference between "has to be" and "is to be"?
This is the example sentence: In case a diarization is desired, a proper XYZ algorithm is/has to be used.
I would like to point out, that my personal opinion is using the XYZ algorithm.
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"Is to be used" is grammatically acceptable but stylistically weak. Better to stick to one of these:
"Has to be used" is stronger than "is to be used."
"Has to" suggests a requirement, meaning that absolutely no other option is acceptable. "Is to" is a matter-of-fact future tense (similar to "will be used").
So it depends. If you feel that:
then use "has to." Otherwise, go with "is to."