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[TOC] Title: Google Video Diffusion Models Author: Jonathan Ho et. al. Publish Year: 22 Jun 2022 Review Date: Thu, Sep 22, 2022 Summary of paper Motivation proposing a diffusion model for video generation that shows very promising initial results Contribution this is the extension of image diffusion model they introduce a new conditional sampling technique for spatial and temporal video extension that performs better. Some key terms Diffusion model A diffusion model specified in continuous time is a generative model with latents Training diffusion model...

[TOC] Title: Fire Burns, Sword Cuts: Commonsense Inductive Bias for Exploration in Text Based Games Author: Dongwon Kelvin Ryu et. al. Publish Year: ACL 2022 Review Date: Thu, Sep 22, 2022 Summary of paper Motivation Text-based games (TGs) are exciting testbeds for developing deep reinforcement learning techniques due to their partially observed environments and large action space. A fundamental challenges in TGs is the efficient exploration of the large action space when the agent has not yet acquired enough knowledge about the environment....

[TOC] Title: Language Models as Zero Shot Planners: Extracting Actionable Knowledge for Embodied Agents Author: Wenlong Huang et. al. Publish Year: Mar 2022 Review Date: Mon, Sep 19, 2022 Summary of paper Motivation Large language models are learning general commonsense world knowledge. so this paper, the author investigate the possibility of grounding high-level tasks, expressed as natural language (e.g., “make breakfast”) to a chosen set of action steps (“open fridge”). Contribution they found out that if pre-trained LMs are large enough and prompted appropriately, they can effectively decompose high-level tasks into mid-level plans without any further training....

[TOC] Title: VinVL: Revisiting Visual Representations in Vision Language Models Author: Pengchuan Zhang et. al. Publish Year: 10 Mar 2021 Review Date: Sat, Sep 3, 2022 Summary of paper Motivation In our experiments we feed the visual features generated by the new object detection model into a Transformer-based VL fusion model Oscar. And utilise an improved approach OSCAR + to pretrain the VL model Contribution has a bigger Object Detection model with larger amount of training data, called “ResNeXt-152 C4” Some key terms Vision Language Pretraining...

[TOC] Title: Oscar: Object Semantic Aligned Pro Training for Vision Language Tasks Author: Xiujun Li et. al. Publish Year: 26 Jul 2020 Review Date: Sat, Sep 3, 2022 Summary of paper Motivation Existing method simply concatenates image region features (patch features) and text features as input to the model to be pre-trained and use self-attention to learn image-text semantic alignments in a brute force manner. the lack of explicit alignment information between the image regions and the text poses alignment modelling a weakly-supervised learning task....

[TOC] Title: DiffCSE: Difference Based Contrastive Learning for Sentence Embeddings Author: Yung-Sung Chuang et. al. Publish Year: 21 Apr 2022 Review Date: Sat, Aug 27, 2022 Summary of paper Motivation DiffCSE learns sentences that are sensitive to the difference between the original sentence and and edited sentence. Contribution we propose DiffCSE, an unsupervised contrastive learning framework for learning sentence embeddings Some key terms DiffCSE this is an unsupervsied contrastive learning framework rather than model architecture Contrastive learning in single modality data...

[TOC] Title: Retrieve Fast, Rerank Smart: Cooperative and Joint Approaches for Improved Cross-Modal Retrieval Author: Gregor Geigle et. al. Publish Year: 19 Feb, 2022 Review Date: Sat, Aug 27, 2022 Summary of paper Motivation they want to combine the cross encoder and the bi encoder advantages and have a more efficient cross-modal search and retrieval efficiency and simplicity of BE approach based on twin network expressiveness and cutting-edge performance of CE methods....

[TOC] Title: MPNet: Masked and Permuted Pre-training for Language Understanding Author: Kaitao Song et. al. Publish Year: 2020 Review Date: Thu, Aug 25, 2022 Summary of paper Motivation BERT adopts masked language modelling (MLM) for pre-training and is one of the most successful pre-training models. Since BERT is all attention block and the positional embedding is the only info that care about the ordering, BERT neglects dependency among predicted tokens...

[TOC] Title: Vision Language Models Towards Multimodal Deep Learning Author: Sergios Karagiannakos Publish Year: 03 Mar 2022 Review Date: Tue, Aug 9, 2022 https://theaisummer.com/vision-language-models/

[TOC] Title: Multi-modal Alignment Using Representation Codebook Author: Jiali Duan, Liqun Chen et. al. Publish Year: 2022 CVPR Review Date: Tue, Aug 9, 2022 Summary of paper Motivation aligning signals from different modalities is an important step as it affects the performance of later stage such as cross-modality fusion. since image and text often reside in different regions of the feature space, directly aligning them at instance level is challenging especially when features are still evolving during training....

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[TOC] Title: Masked World Models for Visual Control 2022 Author: Younggyo Seo et. al. Publish Year: 2022 Review Date: Fri, Jul 1, 2022 https://arxiv.org/abs/2206.14244?context=cs.AI https://sites.google.com/view/mwm-rl Summary of paper Motivation TL:DR: Masked autoencoders (MAE) has emerged as a scalable and effective self-supervised learning technique. Can MAE be also effective for visual model-based RL? Yes! with the recipe of convolutional feature masking and reward prediction to capture fine-grained and task-relevant information. Some key terms Decouple visual representation learning and dynamics learning...

[TOC] Title: Prioritised Experience Replay Author: Neuralnet.ai Publish Year: 25 Feb, 2016 Review Date: Thu, Jun 2, 2022 https://www.neuralnet.ai/a-brief-overview-of-rank-based-prioritized-experience-replay/ Replay memory is essential in RL Replay memory has been successfully deployed in both value based and policy gradient based reinforcement learning algorithms, to great success. The reasons for this success cut right to the heart of reinforcement learning. In particular, replay memory simultaneously solves two outstanding problems with the field....

[TOC] Title: Flamingo: a Visual Language Model for Few-Shot Learning Author: Jean-Baptiste Alayrac et. al. Publish Year: Apr 2022 Review Date: May 2022 Summary of paper Flamingo architecture Pretrained vision encoder: from pixels to features the model’s vision encoder is a pretrained Normalizer-Free ResNet (NFNet) they pretrain the vision encoder using a contrastive objective on their datasets of image and text pairs, using the two term contrastive loss from paper “Learning Transferable Visual Models From Natural Language Supervision”...

[TOC] Title: Augmenting Transformers with KNN-based composite memory for dialog Author: Angela Fan et. al. Publish Year: 2021 Review Date: Apr 2022 Summary of paper Motivation The author proposed augmenting generative Transformer neural network with KNN based Information Fetching module Each KIF module learns a read operation to access fix external knowledge (e.g., WIKI) The author demonstrated the effectiveness of this approach by identifying relevant knowledge required for knowledgeable but engaging dialog from Wikipedia, images and human-written dialog utterances....

[TOC] Title: Generalisable episodic memory for Deep Reinforcement Learning Author: Hao Hu et. al. Publish Year: Jun 2021 Review Date: April 2022 Summary of paper Motivation The author proposed Generalisable Episodic Memory (GEM), which effectively organises the state-action values of episodic memory in a generalisable manner and supports implicit planning on memorised trajectories. so compared to traditional memory table, GEM learns a virtual memory table memorized by deep neural networks to aggregate similar state-action pairs that essentially have the same nature....

[TOC] Title: Offline Reinforcement Learning with Implicit Q-learning Author:Ilya Kostrikov et. al. Publish Year: 2021 Review Date: Mar 2022 Summary of paper Motivation conflict in offline reinforcement learning offline reinforcement learning requires reconciling two conflicting aims: learning a policy that improves over the behaviour policy (old policy) that collected the dataset while at the same time minimizing the deviation from the behaviour policy so as to avoid errors due to distributional shift (e....

[TOC] Title: Online Decision Transformer Author: Qinqing Zheng Publish Year: Feb 2022 Review Date: Mar 2022 Summary of paper Motivation the author proposed online Decision transformer (ODT), an RL algorithm based on sequence modelling that blends offline pretraining with online fine-tuning in a unified framework. ODT builds on the decision transformer architecture previously introduced for offline RL quantify exploration compared to DT, they shifted from deterministic to stochastic policies for defining exploration objectives during the online phase....

[TOC] Title: Improving language models by retrieving from trillions of tokens Author: Sebastian Borgeaud et. al. Publish Year: Feb 2022 Review Date: Mar 2022 Summary of paper Motivation in order to decrease the size of language model, this work suggested retrieval from a large text database as a complementary path to scaling language models. they equip models with the ability to directly access a large dataset to perform prediction – a semi-parametric approach....

[TOC] Title: Can Wikipedia Help Offline Reinforcement Learning Author: Machel Reid et. al. Publish Year: Mar 2022 Review Date: Mar 2022 Summary of paper Motivation Fine-tuning reinforcement learning (RL) models has been challenging because of a lack of large scale off-the-shelf datasets as well as high variance in transferability among different environments. Moreover, when the model is trained from scratch, it suffers from slow convergence speeds In this paper, they look to take advantage of this formulation of reinforcement learning as sequence modelling and investigate the transferability of pre-trained sequence models on other domains (vision, language) when fine tuned on offline RL tasks (control, games)....

[TOC] Title: Generalised Domain Model Acquisition from Action Traces (LOCM2) Author: Stephen Cresswell et. al. Publish Year: 2013 Review Date: Mar 2022 Summary of paper Motivation One approach to the problem of formulating domain models for planning is to learn the models from example action sequences. This work extended LOCM by allowing multiple parameterised state machine to represent a single object. In other words, it is possible to automatically infer the underlying transition system from sample action sequences of the domain....

[TOC] Title: Extracting Action Sequences from Texts Based on Deep Reinforcement Learning Author: Wenfeng Feng et. al. Publish Year: Mar 2018 Review Date: Mar 2022 Summary of paper Motivation the author want to build a model that learns to directly extract action sequences without external tools like POS tagging and dependency parsing results… Annotation dataset structure example Model they exploit the framework to learn two models to predict action names and arguments respectively....

[TOC] Title: NLtoPDDL: One-Shot Learning of PDDL Models from Natural Language Process Manuals Author: Shivam Miglani et. al. Publish Year: 2020 Review Date: Mar 2022 Summary of paper Motivation pipeline Pipeline architecture Phase 1 we have a DQN that learns to extract words that represent action name, action arguments, and the sequence of actions present in annotated NL process manuals. (why only action name, do we need to extract other information?...

[TOC] Title: Foundations for Restraining Bolts: Reinforcement Learning with LTLf/LDLf Restraining Specification Author: Giuseppe De Giacomo et. al. Publish Year: 2019 Review Date: Mar 2022 Summary of paper The author investigated the concept of “restraining bolt” that can control the behaviour of learning agents. Essentially, the way to control a RL agent is that the bolt provides additional rewards to the agent Although this method is essentially the same as reward shaping (providing additional rewards to the agent), the contribution of this paper is...