Interleaved DC DC Converter reduces input Current Ripple or Output Current Ripple too. but its effect on input current ripple reduction is more. you can refer the attached file.
For interleaved Bost convrrter. Input current ripple will be reduce more. Expecially when the converter work near 50% duty cycle for 2 phase interleaved boost converter. And Near 33% or 66% duty cycle for 3 phase interleaved boost converter.