(Replying to PARENT post)

human-like gaits mainly require the correct structural elements (rather than machine learning), like locking knees (as noted in the article) and slightly elastic legs and joints (for energy storage/release as well shock absorbtion).

most robots are energetically inefficient and require extraneous computational power because they don't take advantage of passive dynamics (https://en.wikipedia.org/wiki/Passive_dynamics). it's disappointing to realize that we still haven't caught up to fundamental biological systems yet, even though the research is 2+ decades old.

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(Replying to PARENT post)

Related to "passive dynamics," see "preflexes" https://en.wikipedia.org/wiki/Preflexes

"Preflexes are the latent capacities in the musculoskeletal system that auto-stabilize movements through the use of the nonlinear visco-elastic properties of muscles when they contract.[1][2] The term "preflex" for such a zero-delay, intrinsic feedback loop was coined by Loeb. [3] Unlike stabilization methods using neurons such as reflexes and higher brain control, it happens with minimal time delay. Its chief disadvantage is that it works only to stabilize the main movements of the musculoskeletal system."

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(Replying to PARENT post)

Roboticists have built passive walking robots like the one from Cornell, it walked 5.6 miles without power. https://www.youtube.com/watch?v=LDljbN7eJ5Y Japanese roboticists have built passive walking robot with locking knees: https://www.youtube.com/watch?v=rhu2xNIpgDE
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(Replying to PARENT post)

it's disappointing to realize that we still haven't caught up to fundamental biological systems yet, even though the research is 2+ decades old.

Given that we're the result of billions of years of natural selection, shouldn't we expect that?

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