Search Results for author: Pankaj Malhotra

Found 20 papers, 5 papers with code

Continual Learning for Multivariate Time Series Tasks with Variable Input Dimensions

no code implementations14 Mar 2022 Vibhor Gupta, Jyoti Narwariya, Pankaj Malhotra, Lovekesh Vig, Gautam Shroff

We note that existing continual learning methods do not take into account variability in input dimensions arising due to different subsets of sensors being available across tasks, and struggle to adapt to such variable input dimensions (VID) tasks.

Activity Recognition Continual Learning +2

Learning to Liquidate Forex: Optimal Stopping via Adaptive Top-K Regression

no code implementations25 Feb 2022 Diksha Garg, Pankaj Malhotra, Anil Bhatia, Sanjay Bhat, Lovekesh Vig, Gautam Shroff

We consider learning a trading agent acting on behalf of the treasury of a firm earning revenue in a foreign currency (FC) and incurring expenses in the home currency (HC).

regression

Electricity Consumption Forecasting for Out-of-distribution Time-of-Use Tariffs

no code implementations11 Feb 2022 Jyoti Narwariya, Chetan Verma, Pankaj Malhotra, Lovekesh Vig, Easwara Subramanian, Sanjay Bhat

One of the objectives of such demand response management is to incentivize the consumers to adjust their consumption so that the overall electricity procurement in the wholesale markets is minimized, e. g. it is desirable that consumers consume less during peak hours when cost of procurement for brokers from wholesale markets are high.

Management

Systematic Generalization in Neural Networks-based Multivariate Time Series Forecasting Models

1 code implementation10 Feb 2021 Hritik Bansal, Gantavya Bhatt, Pankaj Malhotra, Prathosh A. P

Systematic generalization aims to evaluate reasoning about novel combinations from known components, an intrinsic property of human cognition.

Inductive Bias Multivariate Time Series Forecasting +3

Batch-Constrained Distributional Reinforcement Learning for Session-based Recommendation

no code implementations16 Dec 2020 Diksha Garg, Priyanka Gupta, Pankaj Malhotra, Lovekesh Vig, Gautam Shroff

Most of the existing deep reinforcement learning (RL) approaches for session-based recommendations either rely on costly online interactions with real users, or rely on potentially biased rule-based or data-driven user-behavior models for learning.

Distributional Reinforcement Learning Offline RL +3

Handling Variable-Dimensional Time Series with Graph Neural Networks

no code implementations1 Jul 2020 Vibhor Gupta, Jyoti Narwariya, Pankaj Malhotra, Lovekesh Vig, Gautam Shroff

Such a combinatorial generalization is achieved by conditioning the layers of a core neural network-based time series model with a "conditioning vector" that carries information of the available combination of sensors for each time series.

Activity Recognition Time Series +2

Graph Neural Networks for Leveraging Industrial Equipment Structure: An application to Remaining Useful Life Estimation

no code implementations30 Jun 2020 Jyoti Narwariya, Pankaj Malhotra, Vishnu Tv, Lovekesh Vig, Gautam Shroff

Deep learning models such as those based on recurrent neural networks (RNNs) or convolutional neural networks (CNNs) fail to explicitly leverage this potentially rich source of domain-knowledge into the learning procedure.

Time Series Time Series Analysis

Meta-Learning for Few-Shot Time Series Classification

no code implementations13 Sep 2019 Jyoti Narwariya, Pankaj Malhotra, Lovekesh Vig, Gautam Shroff, Vishnu Tv

We overcome this limitation in order to train a common agent across domains with each domain having different number of target classes, we utilize a triplet-loss based learning procedure that does not require any constraints to be enforced on the number of classes for the few-shot TSC tasks.

Activity Recognition Classification +5

NISER: Normalized Item and Session Representations to Handle Popularity Bias

2 code implementations10 Sep 2019 Priyanka Gupta, Diksha Garg, Pankaj Malhotra, Lovekesh Vig, Gautam Shroff

The models using normalized item and session-graph representations perform significantly better: i. for the less popular long-tail items in the offline setting, and ii.

Session-Based Recommendations

Meta-Learning for Black-box Optimization

no code implementations16 Jul 2019 Vishnu TV, Pankaj Malhotra, Jyoti Narwariya, Lovekesh Vig, Gautam Shroff

Recently, neural networks trained as optimizers under the "learning to learn" or meta-learning framework have been shown to be effective for a broad range of optimization tasks including derivative-free black-box function optimization.

Meta-Learning

ConvTimeNet: A Pre-trained Deep Convolutional Neural Network for Time Series Classification

no code implementations29 Apr 2019 Kathan Kashiparekh, Jyoti Narwariya, Pankaj Malhotra, Lovekesh Vig, Gautam Shroff

We also provide qualitative insights into the working of CTN by: i) analyzing the activations and filters of first convolution layer suggesting the filters in CTN are generically useful, ii) analyzing the impact of the design decision to incorporate multiple length decisions, and iii) finding regions of time series that affect the final classification decision via occlusion sensitivity analysis.

Computational Efficiency General Classification +3

Transfer Learning for Clinical Time Series Analysis using Deep Neural Networks

no code implementations1 Apr 2019 Priyanka Gupta, Pankaj Malhotra, Jyoti Narwariya, Lovekesh Vig, Gautam Shroff

We, therefore, conclude that pre-trained deep models like TimeNet and HealthNet allow leveraging the advantages of deep learning for clinical time series analysis tasks, while also minimize dependence on hand-crafted features, deal robustly with scarce labeled training data scenarios without overfitting, as well as reduce dependence on expertise and resources required to train deep networks from scratch.

Domain Adaptation Time Series +2

Data-driven Prognostics with Predictive Uncertainty Estimation using Ensemble of Deep Ordinal Regression Models

no code implementations23 Mar 2019 Vishnu TV, Diksha, Pankaj Malhotra, Lovekesh Vig, Gautam Shroff

We propose a novel deep learning based approach for Prognostics with Uncertainty Quantification that is useful in scenarios where: (i) access to labeled failure data is scarce due to rarity of failures (ii) future operational conditions are unobserved and (iii) inherent noise is present in the sensor readings.

regression Time Series Analysis +1

Transfer Learning for Clinical Time Series Analysis using Recurrent Neural Networks

no code implementations4 Jul 2018 Priyanka Gupta, Pankaj Malhotra, Lovekesh Vig, Gautam Shroff

We consider transferring the knowledge captured in an RNN trained on several source tasks simultaneously using a large labeled dataset to build the model for a target task with limited labeled data.

Mortality Prediction Time Series +2

Predicting Remaining Useful Life using Time Series Embeddings based on Recurrent Neural Networks

no code implementations4 Sep 2017 Narendhar Gugulothu, Vishnu Tv, Pankaj Malhotra, Lovekesh Vig, Puneet Agarwal, Gautam Shroff

We propose Embed-RUL: a novel approach for RUL estimation from sensor data that does not rely on any degradation-trend assumptions, is robust to noise, and handles missing values.

Time Series Time Series Analysis

TimeNet: Pre-trained deep recurrent neural network for time series classification

2 code implementations23 Jun 2017 Pankaj Malhotra, Vishnu Tv, Lovekesh Vig, Puneet Agarwal, Gautam Shroff

Inspired by the tremendous success of deep Convolutional Neural Networks as generic feature extractors for images, we propose TimeNet: a deep recurrent neural network (RNN) trained on diverse time series in an unsupervised manner using sequence to sequence (seq2seq) models to extract features from time series.

Dynamic Time Warping General Classification +3

Multi-Sensor Prognostics using an Unsupervised Health Index based on LSTM Encoder-Decoder

no code implementations22 Aug 2016 Pankaj Malhotra, Vishnu Tv, Anusha Ramakrishnan, Gaurangi Anand, Lovekesh Vig, Puneet Agarwal, Gautam Shroff

Many approaches for estimation of Remaining Useful Life (RUL) of a machine, using its operational sensor data, make assumptions about how a system degrades or a fault evolves, e. g., exponential degradation.

Exponential degradation Time Series +1

LSTM-based Encoder-Decoder for Multi-sensor Anomaly Detection

9 code implementations1 Jul 2016 Pankaj Malhotra, Anusha Ramakrishnan, Gaurangi Anand, Lovekesh Vig, Puneet Agarwal, Gautam Shroff

Mechanical devices such as engines, vehicles, aircrafts, etc., are typically instrumented with numerous sensors to capture the behavior and health of the machine.

Anomaly Detection Outlier Detection +3

ODE - Augmented Training Improves Anomaly Detection in Sensor Data from Machines

no code implementations5 May 2016 Mohit Yadav, Pankaj Malhotra, Lovekesh Vig, K Sriram, Gautam Shroff

The available data is then augmented with data generated from the ODE, and the anomaly detector is retrained on this augmented dataset.

Anomaly Detection Time Series +1

Long Short Term Memory Networks for Anomaly Detection in Time Series

1 code implementation ESANN 2015 Pankaj Malhotra, Lovekesh Vig, Gautam Shroff, Puneet Agarwal

Long Short Term Memory (LSTM) networks have been demonstrated to be particularly useful for learning sequences containing longer term patterns of unknown length, due to their ability to maintain long term memory.

Anomaly Detection Fault Detection +2

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