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✨ICLR 2024 Spotlight Still hand-labeling phases or tuning GANs with your trajectories? We propose FLD, a self-supervised representation method that extracts spatial-temporal relationships in high-dimensional trajectories. RL policies informed by FLD show extended generality.🧵

81,979 просмотров • 2 лет назад •via X (Twitter)

Комментарии: 11

Фото профиля Chenhao Li
Chenhao Li2 лет назад

The availability of reference trajectories has significantly propelled the advancement of motion learning techniques. How do we efficiently represent these high-dimensional, long-horizon, highly nonlinear signals such that downstream learning tasks can generalize better?

Фото профиля Chenhao Li
Chenhao Li2 лет назад

Fourier Latent Dynamics (FLD) achieves so by featuring dynamics in a continuously parameterized latent space. The latent encodings consist of a varying component (phi) that indicates local time indices and an invariant component (theta) that represents global motion features.

Фото профиля Chenhao Li
Chenhao Li2 лет назад

Each motion (or any other quasi-periodic signal) induces a ring in the latent manifold, where the radius denotes the invariant high-level features, and the angle denotes the current frame of that motion.

Фото профиля Chenhao Li
Chenhao Li2 лет назад

This way, with a few parameters, FLD is able to represent diverse, theoretically infinitely long motion trajectories or any other quasi-periodic signal. In the table, d denotes the number of state dimensions, tau trajectory length, H window size, and c number of latent channels.

Фото профиля Chenhao Li
Chenhao Li2 лет назад

The open-loop reconstruction of FLD by consecutively propagating the latent dynamics and decoding to the state space demonstrates high fidelity on test data unseen during training, compared with less structured models, including FF networks and Periodic Autoencoders (PAE).

Фото профиля Chenhao Li
Chenhao Li2 лет назад

With such an efficient latent representation, we train a downstream tracking policy with RL. A motion is sampled at each episode. Its latent phase propagates through time while the high-level features stay constant. The tracking reward is computed each step with reconstruction.

Фото профиля Chenhao Li
Chenhao Li2 лет назад

This structure enables real-time motion tracking. During inference, FLD encodes real-time motion input as tracking targets, irrespective of their periodic or quasi-periodic nature.

Фото профиля Chenhao Li
Chenhao Li2 лет назад

FLD provides a fallback mechanism with anomaly detection from its autoencoder nature. When a potentially risky target is proposed, FLD rejects the input and resorts to a safe motion by propagating the latent dynamics with the previous parameters.

Фото профиля Chenhao Li
Chenhao Li2 лет назад

We provide an ablation video illustrating the importance of the fallback mechanism as a safety filter in online motion tracking.

Фото профиля Chenhao Li
Chenhao Li2 лет назад

This work has been published at ICLR 2024 @iclr_conf by the Biomimetic Robotics Lab @MITMechE @MIT. It will be presented as a spotlight paper in May in Vienna, Austria.

Фото профиля Chenhao Li
Chenhao Li2 лет назад

Authors Chenhao Li @breadli428, Elijah Stanger-Jones, Steve Heim, Sangbae Kim Paper Project Code Videos @MITMechE @MITEECS @MIT_CSAIL @MIT

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naveen manwani

10,578 просмотров • 11 месяцев назад

We live in an increasingly fractured, polarised world where principles and values we once took for granted in Australia are being undermined. Today the Albanese Labor government gets away with doing things that would simply not have been acceptable in Australia a generation or two ago. Labor may have won the 2025 election with only 35% of the primary vote, but that hasn’t made the problems Labor created go away. We still have a cost-of-living crisis. We still have a housing crisis. We still have record immigration, increasing debt, huge budget deficits and declining economic productivity. The Prime Minister’s so-called productivity roundtable of his sycophants won’t change things at all unless it includes people who understand productivity and business: people like Gina Rhinehart, Solomon Lew, Gerry Harvey and Dick Smith. Taxpayers are still forced to foot the bill for subsidising renewable projects in the pursuit of net zero, coupled with rises in our electricity bills of more than 300% over the past 20 years or so. And more recently, Labor has gambled with our national security. For decades, Australia’s defence has mainly been funded by American taxpayers. America’s nuclear deterrence has prevented global war between major powers, America supplies us with our military platforms and our advanced weapons, and under AUKUS America will hand over to Australia the most closely-guarded military technology on the planet: nuclear propulsion. Yet our current Labor government is publicly appearing less than grateful for this generous support from the ‘arsenal of democracy’. Labor is ghosting our most important ally – the United States – and to all appearances is sucking up to communist China, Australia’s most potent adversary. China routinely commits acts of aggression against Australia as if it’s entitled to do so, and is not hiding its intentions to militarily and economically dominate our region. America simply wants the countries with which it shares close alliances and democratic values to step up and do some of the heavy lifting by increasing their defence spending. It’s called growing a back bone and taking responsibility to defend yourself instead of relying on Americans to fund your battles with their money and lives. The Prime Minister is gambling that he won’t have to, and that is a big mistake. It’s a purely political mistake based on arrogance. It’s not principled. Labor hates everything about Trump and Republicans. Labor has failed to appreciate the importance of America to our security, and that our relationship with the world’s most powerful nation must endure beyond the current occupants of the Lodge and the White House. It’s impossible to imagine Bob Hawke – Labor’s most successful and longest-serving Prime Minister – supporting this. He was a noted champion of the US alliance despite the very conservative Reagan and Bush administrations being in the White House. Hawke was also a vocal critic of communist China, especially after the Tiananmen Square massacre in 1989. Hawke understood Australian principles. Prime Minister Albanese never got the memo, and now our relations with America are declining when we can least afford it. This is not in our best interests. Australia needs a statement of binding principles to govern how we conduct ourselves on the world stage, and to ensure petty politics does not risk important international relationships that must last well beyond every three-year Parliamentary term. This statement needs to say who we are, what Australia stands for, and who we stand with: · democracies like the US and Israel, not communist dictatorships or terrorist regimes; · we stand for the rule of law, self-determination and freedom; and · international peace and order, reinforced by a strong military to deter those who – like China – would disrupt that peace and order. These are One Nation’s principles. They should be Australia’s principles. They used to be. They were principles that didn’t even need stating a generation ago, but Australia is heading down a path under Labor where we cannot be certain of them any longer.

Pauline Hanson 🇦🇺

52,109 просмотров • 1 год назад