Perhaps you should try some spelling variations:
optimization algorithms » optimisation algorithm, estimation algorithm, optimized algorithms
estimation algorithms » estimation algorithm, optimisation algorithm, approximation algorithms
parameter estimation » parameter estimates, parameter optimization
near optimization » network optimization, stage optimization, _ optimization
modified near » modified seird, modified adam

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• Performing a fuzzy search may retrieve terms with similar spellings: (( modified near optimization algorithms ) or ( modified parameter estimation algorithms ))~.
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