Perhaps you should try some spelling variations:
optimization algorithms » optimisation algorithm, estimation algorithms, estimation algorithm
approximation algorithm » approximation algorithms
adaptive optimization » objective optimization, adaptive quantization, static optimization
adam approximation » _ approximation, one approximation, time approximation
modified adaptive » modified passive
modified adam » modified df, modified near

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (( modified adaptive optimization algorithms ) OR ( modified adam approximation algorithm ))~.
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