Search Results for author: Alexander Amini

Found 32 papers, 14 papers with code

The Natural Lottery Ticket Winner: Reinforcement Learning with Ordinary Neural Circuits

no code implementations ICML 2020 Ramin Hasani, Mathias Lechner, Alexander Amini, Daniela Rus, Radu Grosu

We propose a neural information processing system which is obtained by re-purposing the function of a biological neural circuit model to govern simulated and real-world control tasks.

reinforcement-learning Reinforcement Learning (RL)

Drive Anywhere: Generalizable End-to-end Autonomous Driving with Multi-modal Foundation Models

no code implementations26 Oct 2023 Tsun-Hsuan Wang, Alaa Maalouf, Wei Xiao, Yutong Ban, Alexander Amini, Guy Rosman, Sertac Karaman, Daniela Rus

As autonomous driving technology matures, end-to-end methodologies have emerged as a leading strategy, promising seamless integration from perception to control via deep learning.

Autonomous Driving Data Augmentation

Capsa: A Unified Framework for Quantifying Risk in Deep Neural Networks

no code implementations1 Aug 2023 Sadhana Lolla, Iaroslav Elistratov, Alejandro Perez, Elaheh Ahmadi, Daniela Rus, Alexander Amini

We validate capsa by implementing state-of-the-art uncertainty estimation algorithms within the capsa framework and benchmarking them on complex perception datasets.

Benchmarking

Understanding Reconstruction Attacks with the Neural Tangent Kernel and Dataset Distillation

1 code implementation2 Feb 2023 Noel Loo, Ramin Hasani, Mathias Lechner, Alexander Amini, Daniela Rus

We show that both theoretically and empirically, reconstructed images tend to "outliers" in the dataset, and that these reconstruction attacks can be used for \textit{dataset distillation}, that is, we can retrain on reconstructed images and obtain high predictive accuracy.

Reconstruction Attack

Efficient Dataset Distillation Using Random Feature Approximation

2 code implementations21 Oct 2022 Noel Loo, Ramin Hasani, Alexander Amini, Daniela Rus

Dataset distillation compresses large datasets into smaller synthetic coresets which retain performance with the aim of reducing the storage and computational burden of processing the entire dataset.

Dataset Condensation regression

Are All Vision Models Created Equal? A Study of the Open-Loop to Closed-Loop Causality Gap

no code implementations9 Oct 2022 Mathias Lechner, Ramin Hasani, Alexander Amini, Tsun-Hsuan Wang, Thomas A. Henzinger, Daniela Rus

Our results imply that the causality gap can be solved in situation one with our proposed training guideline with any modern network architecture, whereas achieving out-of-distribution generalization (situation two) requires further investigations, for instance, on data diversity rather than the model architecture.

Autonomous Driving Image Classification +1

Liquid Structural State-Space Models

1 code implementation26 Sep 2022 Ramin Hasani, Mathias Lechner, Tsun-Hsuan Wang, Makram Chahine, Alexander Amini, Daniela Rus

A proper parametrization of state transition matrices of linear state-space models (SSMs) followed by standard nonlinearities enables them to efficiently learn representations from sequential data, establishing the state-of-the-art on a large series of long-range sequence modeling benchmarks.

Heart rate estimation Long-range modeling +3

Revisiting the Adversarial Robustness-Accuracy Tradeoff in Robot Learning

no code implementations15 Apr 2022 Mathias Lechner, Alexander Amini, Daniela Rus, Thomas A. Henzinger

However, the improved robustness does not come for free but rather is accompanied by a decrease in overall model accuracy and performance.

Adversarial Robustness Autonomous Driving +2

Differentiable Control Barrier Functions for Vision-based End-to-End Autonomous Driving

no code implementations4 Mar 2022 Wei Xiao, Tsun-Hsuan Wang, Makram Chahine, Alexander Amini, Ramin Hasani, Daniela Rus

They are interpretable at scale, achieve great test performance under limited training data, and are safety guaranteed in a series of autonomous driving scenarios such as lane keeping and obstacle avoidance.

Autonomous Driving

Closed-form Continuous-time Neural Models

1 code implementation25 Jun 2021 Ramin Hasani, Mathias Lechner, Alexander Amini, Lucas Liebenwein, Aaron Ray, Max Tschaikowski, Gerald Teschl, Daniela Rus

To this end, we compute a tightly-bounded approximation of the solution of an integral appearing in LTCs' dynamics, that has had no known closed-form solution so far.

Sentiment Analysis Time Series Prediction

Sparse Flows: Pruning Continuous-depth Models

1 code implementation NeurIPS 2021 Lucas Liebenwein, Ramin Hasani, Alexander Amini, Daniela Rus

Our empirical results suggest that pruning improves generalization for neural ODEs in generative modeling.

Causal Navigation by Continuous-time Neural Networks

1 code implementation NeurIPS 2021 Charles Vorbach, Ramin Hasani, Alexander Amini, Mathias Lechner, Daniela Rus

We evaluate our method in the context of visual-control learning of drones over a series of complex tasks, ranging from short- and long-term navigation, to chasing static and dynamic objects through photorealistic environments.

Imitation Learning

Efficient and Robust LiDAR-Based End-to-End Navigation

no code implementations20 May 2021 Zhijian Liu, Alexander Amini, Sibo Zhu, Sertac Karaman, Song Han, Daniela Rus

On the other hand, increasing the robustness of these systems is also critical; however, even estimating the model's uncertainty is very challenging due to the cost of sampling-based methods.

Neural circuit policies enabling auditable autonomy

1 code implementation13 Oct 2020 Mathias Lechner, Ramin Hasani, Alexander Amini, Thomas A. Henzinger, Daniela Rus & Radu Grosu

A central goal of artificial intelligence in high-stakes decision-making applications is to design a single algorithm that simultaneously expresses generalizability by learning coherent representations of their world and interpretable explanations of its dynamics.

Autonomous Vehicles Decision Making

Deep Orientation Uncertainty Learning based on a Bingham Loss

1 code implementation ICLR 2020 Igor Gilitschenski, Roshni Sahoo, Wilko Schwarting, Alexander Amini, Sertac Karaman, Daniela Rus

Reasoning about uncertain orientations is one of the core problems in many perception tasks such as object pose estimation or motion estimation.

Motion Estimation Pose Estimation

Deep Evidential Regression

4 code implementations NeurIPS 2020 Alexander Amini, Wilko Schwarting, Ava Soleimany, Daniela Rus

We demonstrate learning well-calibrated measures of uncertainty on various benchmarks, scaling to complex computer vision tasks, as well as robustness to adversarial and OOD test samples.

regression

Deep Evidential Uncertainty

no code implementations25 Sep 2019 Alexander Amini, Wilko Schwarting, Ava Soleimany, Daniela Rus

In this paper, we propose a novel method for training deterministic NNs to not only estimate the desired target but also the associated evidence in support of that target.

regression

Variational End-to-End Navigation and Localization

no code implementations25 Nov 2018 Alexander Amini, Guy Rosman, Sertac Karaman, Daniela Rus

We define a novel variational network capable of learning from raw camera data of the environment as well as higher level roadmaps to predict (1) a full probability distribution over the possible control commands; and (2) a deterministic control command capable of navigating on the route specified within the map.

Liquid Time-constant Recurrent Neural Networks as Universal Approximators

no code implementations1 Nov 2018 Ramin M. Hasani, Mathias Lechner, Alexander Amini, Daniela Rus, Radu Grosu

In this paper, we introduce the notion of liquid time-constant (LTC) recurrent neural networks (RNN)s, a subclass of continuous-time RNNs, with varying neuronal time-constant realized by their nonlinear synaptic transmission model.

Can a Compact Neuronal Circuit Policy be Re-purposed to Learn Simple Robotic Control?

1 code implementation11 Sep 2018 Ramin Hasani, Mathias Lechner, Alexander Amini, Daniela Rus, Radu Grosu

Inspired by the structure of the nervous system of the soil-worm, C. elegans, we introduce Neuronal Circuit Policies (NCPs), defined as the model of biological neural circuits reparameterized for the control of an alternative task.

Response Characterization for Auditing Cell Dynamics in Long Short-term Memory Networks

no code implementations11 Sep 2018 Ramin M. Hasani, Alexander Amini, Mathias Lechner, Felix Naser, Radu Grosu, Daniela Rus

In this paper, we introduce a novel method to interpret recurrent neural networks (RNNs), particularly long short-term memory networks (LSTMs) at the cellular level.

Spatial Uncertainty Sampling for End-to-End Control

no code implementations13 May 2018 Alexander Amini, Ava Soleimany, Sertac Karaman, Daniela Rus

Dropout training in deep NNs approximates Bayesian inference in a deep Gaussian process and can thus be used to estimate model uncertainty.

Autonomous Vehicles Bayesian Inference

Accelerated Convolutions for Efficient Multi-Scale Time to Contact Computation in Julia

1 code implementation28 Dec 2016 Alexander Amini, Berthold Horn, Alan Edelman

Efficient computation of convolutions is critical to artificial intelligence in real-time applications, like machine vision, where convolutions must be continuously and efficiently computed on tens to hundreds of kilobytes per second.

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