A Survey of Deep Active Learning

Pengzhen RenYun XiaoXiaojun ChangPo-Yao (Bernie) HuangZhihui LiXiaojiang ChenXin Wang

article2020ACM Computing Surveys1,559 citations

Presents a systematic taxonomy of deep active learning strategies to help researchers train data-hungry neural networks with minimal manual labeling effort across label-scarce application domains.

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Modern deep learning models achieve high performance across many industries, but their training relies heavily on massive volumes of manually annotated data. Acquiring these labels incurs substantial financial and operational costs, particularly in specialized domains such as medical imaging, speech recognition, and robotics, where domain experts must perform the annotations. Active learning addresses this bottleneck by identifying and querying only the most informative unlabeled samples for human annotation. However, combining traditional active learning with deep learning presents structural challenges, including deep models exhibiting overconfident uncertainty estimates, deep neural networks requiring large amounts of data to prevent overfitting, and incompatibilities between the iterative query process and deep neural network training pipelines.

The article systematically reviews and evaluates the field of deep active learning, which integrates active learning sample selection with deep feature extraction. It categorizes current methodologies, examines how they address core integration challenges, reviews practical applications across diverse fields, and analyzes emerging research directions.

To synthesize the field, the article analyzes approximately 270 research publications updated through late 2020. The evaluation covers theoretical query designs, model training pipelines, and empirical implementations across visual processing, natural language processing, and other specialized domains. The examination groups query approaches into batch-mode selection, deep Bayesian active learning, density-based core-set strategies, hybrid algorithms, and automated design methods.

The review outlines several key findings. First, traditional one-by-one sample selection fails in deep learning; efficient training requires batch query strategies, though naive batching often selects redundant samples. Second, hybrid query strategies that balance model prediction uncertainty with sample diversity consistently perform more reliably than strategies relying on either uncertainty or diversity alone. Third, leveraging unlabeled data and synthetic data via generative models or semi-supervised methods provides crucial performance gains, often matching or exceeding the benefits gained from refining query strategies alone. Fourth, treating active learning and deep model training as two separated steps causes optimization divergence, whereas unified, multi-layer architectures provide superior and task-agnostic performance across varied applications.

These findings indicate that organizations can achieve significant cost savings and efficiency gains by adopting deep active learning in data-scarce and expert-dependent workflows. By reducing the volume of manual labeling required by orders of magnitude while preserving target accuracy, development cycles can be shortened. However, real-world implementations must account for the computational overhead of batch selection and iterative model updates.

Organizations implementing these systems should adopt hybrid selection strategies that account for both sample informativeness and dataset diversity rather than relying strictly on standard model confidence outputs. Practitioners should also integrate semi-supervised learning and data augmentation to make full use of unlabeled datasets. Furthermore, development teams must incorporate dynamic stopping criteria based on prediction stability rather than fixed iterations to avoid either overspending the annotation budget or under-training the model.

The field currently exhibits notable uncertainties due to inconsistent experimental settings across existing literature. Reported performance for standard random sampling baselines varies widely between studies (by as much as 8% to 13% on identical benchmark datasets), which can obscure true algorithmic gains. In addition, deep active learning methods are not universally superior for every dataset type, especially where sample importance differences are negligible. Readers should exercise caution when comparing reported gains and prioritize establishing unified evaluation baselines, reproducible benchmarks, and proper ablation studies before deploying systems into production.

arXiv: 2009.00236
  • Paper: Deep Bayesian Active Learning with Image Data, Yarin Gal et al. (2017). This seminal work demonstrates the practical integration of Bayesian deep neural networks with uncertainty-based acquisition functions for high-dimensional active learning, establishing a core milestone reviewed in the survey.
  • Paper: Active Learning for Convolutional Neural Networks: A Core-Set Approach, Ozan Sener et al. (2018). This paper establishes the core-set geometric selection framework for convolutional neural networks, serving as the foundational representative method for distribution- and diversity-based deep active learning.
  • Paper: Improving Generalization with Active Learning, David Cohn et al. (1994). This foundational paper introduces selective sampling and region-of-uncertainty query strategies in neural networks, defining key classical active learning principles adapted by deep learning frameworks.
  • Paper: Active Learning with Statistical Models, David Cohn et al. (1996). This paper formulates variance reduction and statistically optimal query selection, providing the theoretical basis for modern model-dependent sample selection criteria.
  • Paper: Query by committee, H. Seung et al. (1992). This foundational work introduces the Query by Committee algorithm, which underpins ensemble disagreement metrics and modern committee-based deep active learning methods.
  • Paper: Support Vector Machine Active Learning with Applications to Text Classification, Simon Tong et al. (2001). This work establishes pool-based active learning and margin-based uncertainty sampling, formalizing concepts heavily referenced and generalized in deep active learning taxonomies.
  • Paper: Combining active learning and semi-supervised learning using Gaussian fields and harmonic functions, Xiaojin Zhu et al. (2003). This paper establishes the classic paradigm of combining active learning with semi-supervised label propagation, a core hybrid strategy detailed in the survey.
  • Paper: A survey on semi-supervised learning, Jesper E. van Engelen et al. (2019). This comprehensive survey provides essential background on semi-supervised learning paradigms that are frequently unified with active learning in label-scarce deep learning regimes.
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Abstract

Active learning (AL) attempts to maximize the performance gain of the model by marking the fewest samples. Deep learning (DL) is greedy for data and requires a large amount of data supply to optimize massive parameters, so that the model learns how to extract high-quality features. In recent years, due to the rapid development of internet technology, we are in an era of information torrents and we have massive amounts of data. In this way, DL has aroused strong interest of researchers and has been rapidly developed. Compared with DL, researchers have relatively low interest in AL. This is mainly because before the rise of DL, traditional machine learning requires relatively few labeled samples. Therefore, early AL is difficult to reflect the value it deserves. Although DL has made breakthroughs in various fields, most of this success is due to the publicity of the large number of existing annotation datasets. However, the acquisition of a large number of high-quality annotated datasets consumes a lot of manpower, which is not allowed in some fields that require high expertise, especially in the fields of speech recognition, information extraction, medical images, etc. Therefore, AL has gradually received due attention. A natural idea is whether AL can be used to reduce the cost of sample annotations, while retaining the powerful learning capabilities of DL. Therefore, deep active learning (DAL) has emerged. Although the related research has been quite abundant, it lacks a comprehensive survey of DAL. This article is to fill this gap, we provide a formal classification method for the existing work, and a comprehensive and systematic overview. In addition, we also analyzed and summarized the development of DAL from the perspective of application. Finally, we discussed the confusion and problems in DAL, and gave some possible development directions for DAL.

Table of Contents

  • 1 Introduction
  • 1.1 Deep Learning
  • 1.2 Active Learning
  • 2 The necessity and challenge of combining DL and AL
  • 3 Deep Active Learning
  • 3.1 Query Strategy Optimization in DeepAL
  • 3.1.1 Batch Mode DeepAL (BMDAL)
  • 3.1.2 Uncertainty-based and Hybrid Query Strategies
  • 3.1.3 Deep Bayesian Active Learning (DBAL)
  • 3.1.4 Density-based Methods
  • 3.1.5 Automated Design of DeepAL
  • 3.2 Data Expansion of Labeled Samples in DeepAL
  • 3.3 DeepAL Generic Framework
  • 3.4 DeepAL Stopping Strategy
  • 4 Application of DeepAL in fields such as vision and NLP
  • 4.1 Visual Data Processing
  • 4.1.1 Image classification and recognition
  • 4.1.2 Object detection and semantic segmentation
  • 4.1.3 Video processing
  • 4.2 Natural Language Processing (NLP)
  • 4.2.1 Machine translation
  • 4.2.2 Text classification
  • 4.2.3 Semantic analysis
  • 4.2.4 Information extraction
  • 4.2.5 Question-answering
  • 4.3 Other Applications
  • 5 Discussion and future directions
  • 6 Summary and conclusions
  • References

Knowls

  1. Knowl 1 — Formal Optimization Formulation of Pool-Based Deep Active Learning

    equation

    In pool-based deep active learning (DeepAL), let Un={X,Y}\mathcal{U}_n = \{\mathcal{X}, \mathcal{Y}\} denote an unlabeled dataset consisting of nn samples, where X\mathcal{X} is the input sample space, Y\mathcal{Y} is the label space, and P(x,y)P(x, y) represents the underlying data distribution with x∈Xx \in \mathcal{X} and y∈Yy \in \mathcal{Y}. Let Lm={X,Y}\mathcal{L}_m = \{X, Y\} denote the current labeled training set containing mm samples, where X⊂XX \subset \mathcal{X} and Y⊂YY \subset \mathcal{Y}. A deep neural network hypothesis f∈Ff \in \mathcal{F} maps inputs to predictions, f:X→Yf: \mathcal{X} \rightarrow \mathcal{Y}.

    Given a loss function ℓ(⋅)∈R+\ell(\cdot) \in \mathbb{R}^+, the objective of supervised DeepAL is to design an active query strategy Q:Un→LmQ: \mathcal{U}_n \rightarrow \mathcal{L}_m such that the deep model trained on Lm\mathcal{L}_m minimizes expected risk over the data distribution while maintaining a label budget m≪nm \ll n:

    arg⁡min⁡Lm⊆Un,(x,y)∈Lm,(x,y)∈UnE(x,y)[ℓ(f(x),y)]\arg \min_{\mathcal{L}_m \subseteq \mathcal{U}_n, (x, y) \in \mathcal{L}_m, (x, y) \in \mathcal{U}_n} \mathbb{E}_{(x, y)} [\ell(f(x), y)]

    The goal is to minimize the required labeled sample size mm while guaranteeing that the deep model achieves a target generalization performance level.

  2. Knowl 2 — Core Challenges in Integrating Active Learning with Deep Learning

    definition

    Combining active learning (AL) with deep learning (DL) into Deep Active Learning (DeepAL) encounters three fundamental structural challenges:

    1. Model Uncertainty Unreliability: Standard deep networks using softmax output layers produce overconfident class probabilities. The Softmax Response (SR) of the output layer is often poorly calibrated as an uncertainty estimate, leading naive uncertainty sampling to perform on par with or worse than random selection.
    2. Data-Hunger vs. Small Label Updates: Deep neural networks require large volumes of labeled data to optimize millions of parameters without severe overfitting. In contrast, traditional AL typically queries samples in a one-by-one sequential mode, which is computationally prohibitive and ineffective for training deep networks.
    3. Processing Pipeline Inconsistency: Classical active learning algorithms decouple feature representation from classifier training and assume fixed feature vectors. In contrast, deep learning jointly optimizes representation learning and classification layers. Treating AL query selection and deep model training as separate pipelines can cause representation divergence and optimization instability.
  3. Knowl 3 — Batch Mode Deep Active Learning and Joint Mutual Information

    model/method

    Batch Mode Deep Active Learning (BMDAL) replaces single-sample queries with batch-level candidate selection. At each acquisition step, an acquisition function abatch(B,fθ(L))a_{\text{batch}}(\mathcal{B}, f_\theta(\mathcal{L})) selects a batch of candidate unlabeled data B∗={x1∗,…,xb∗}⊆U\mathcal{B}^* = \{x_1^*, \dots, x_b^*\} \subseteq \mathcal{U} of size bb:

    B∗=arg⁡max⁡B⊆Uabatch(B,fθ(L))\mathcal{B}^* = \arg\max_{\mathcal{B} \subseteq \mathcal{U}} a_{\text{batch}}(\mathcal{B}, f_\theta(\mathcal{L}))

    where fθ(L)f_\theta(\mathcal{L}) is the deep model parameterized by θ\theta trained on the labeled dataset L\mathcal{L}.

    A naive batch acquisition based on Bayesian Active Learning by Disagreement (BALD) sums individual mutual information scores independently:

    aBALD({x1,…,xb},P(ω∣Dtrain))=∑i=1bI(yi;ω∣xi,Dtrain)a_{\text{BALD}}(\{x_1, \dots, x_b\}, P(\omega \mid \mathcal{D}_{\text{train}})) = \sum_{i=1}^b \mathbb{I}(y_i; \omega \mid x_i, \mathcal{D}_{\text{train}})

    where I(y;ω∣x,Dtrain)=H(y∣x,Dtrain)−EP(ω∣Dtrain)[H(y∣x,ω,Dtrain)]\mathbb{I}(y; \omega \mid x, \mathcal{D}_{\text{train}}) = \mathbb{H}(y \mid x, \mathcal{D}_{\text{train}}) - \mathbb{E}_{P(\omega \mid \mathcal{D}_{\text{train}})} [\mathbb{H}(y \mid x, \omega, \mathcal{D}_{\text{train}})], ω∼P(ω∣Dtrain)\omega \sim P(\omega \mid \mathcal{D}_{\text{train}}) represents model parameters conditioned on labeled data Dtrain\mathcal{D}_{\text{train}}, and H(⋅)\mathbb{H}(\cdot) denotes entropy. Because this formulation scores instances independently, it frequently selects batches containing mutually redundant samples.

    To account for intra-batch correlation, BatchBALD optimizes the joint mutual information between the joint distribution of predictions y1:b=(y1,…,yb)y_{1:b} = (y_1, \dots, y_b) for the candidate batch x1:b=(x1,…,xb)x_{1:b} = (x_1, \dots, x_b) and model parameters ω\omega:

    aBatchBALD({x1,…,xb},P(ω∣Dtrain))=I(y1:b;ω∣x1:b,Dtrain)=H(y1:b∣x1:b,Dtrain)−EP(ω∣Dtrain)[H(y1:b∣x1:b,ω,Dtrain)]a_{\text{BatchBALD}}(\{x_1, \dots, x_b\}, P(\omega \mid \mathcal{D}_{\text{train}})) = \mathbb{I}(y_{1:b}; \omega \mid x_{1:b}, \mathcal{D}_{\text{train}}) = \mathbb{H}(y_{1:b} \mid x_{1:b}, \mathcal{D}_{\text{train}}) - \mathbb{E}_{P(\omega \mid \mathcal{D}_{\text{train}})} [\mathbb{H}(y_{1:b} \mid x_{1:b}, \omega, \mathcal{D}_{\text{train}})]

    This joint formulation maximizes collective information while explicitly penalizing intra-batch sample similarity.

  4. Knowl 4 — Hybrid Query Strategies Balancing Uncertainty and Diversity in DeepAL

    model/method

    Pure uncertainty-based sampling in DeepAL causes sampling bias because queried samples cluster near existing decision boundaries and fail to represent the global data distribution. Conversely, purely diversity-based sampling risks selecting uninformative instances from low-density regions. Hybrid query strategies optimize both criteria simultaneously.

    In the Exploration-P method, uncertainty is measured via predictive entropy E(S)=∑xi∈SE(xi)E(S) = \sum_{x_i \in S} \mathbb{E}(x_i), where for kk classes, E(x)=−∑j=1kP(yj∣x)log⁡P(yj∣x)\mathbb{E}(x) = -\sum_{j=1}^k P(y_j \mid x) \log P(y_j \mid x). Subset redundancy R(S)R(S) is defined via a similarity matrix M\mathbf{M} and feature extractor f(x)f(x):

    R(S)=∑xi∈S∑xj∈SSim(xi,xj),where Sim(xi,xj)=f(xi)Mf(xj)R(S) = \sum_{x_i \in S} \sum_{x_j \in S} \text{Sim}(x_i, x_j), \quad \text{where } \text{Sim}(x_i, x_j) = f(x_i) \mathbf{M} f(x_j)

    The acquisition objective maximizes entropy while penalizing average redundancy:

    I(S)=E(S)−α∣S∣R(S)I(S) = E(S) - \frac{\alpha}{|S|} R(S)

    where α≥0\alpha \ge 0 balances uncertainty and redundancy.

    Alternative hybrid DeepAL approaches include:

    • BADGE (Batch Active Learning by Diverse Gradient Embeddings): Computes hallucinated gradient embeddings where vector magnitudes reflect model uncertainty and vector orientations reflect diversity, selecting batches via kk-means++ seeding without manual hyperparameter tuning.
    • WAAL (Wasserstein Adversarial Active Learning): Formulates query selection as distribution matching using the Wasserstein distance to explicitly balance uncertainty and feature diversity.
    • TA-VAAL (Task-Aware Variational Adversarial Active Learning): Combines a task-loss prediction module with variational adversarial ranking to capture both task-specific uncertainty and latent distribution coverage.
  5. Knowl 5 — Deep Bayesian Active Learning (DBAL) Framework

    model/method

    Deep Bayesian Active Learning (DBAL) models parameter uncertainty in deep neural networks to produce well-calibrated confidence estimates for sample selection.

    Let X\mathcal{X} and Y\mathcal{Y} be the input and output spaces. A neural network f(x;θ)f(x; \theta) has a prior p(θ)p(\theta) (typically Gaussian) over its parameters θ\theta. The likelihood for class cc is p(y=c∣x,θ)=softmax(f(x;θ))p(y = c \mid x, \theta) = \text{softmax}(f(x; \theta)). The parameter posterior conditioned on training data (X,Y)(X, Y) is:

    p(θ∣X,Y)=p(Y∣X,θ)p(θ)p(Y∣X)p(\theta \mid X, Y) = \frac{p(Y \mid X, \theta) p(\theta)}{p(Y \mid X)}

    For an unlabeled data point x∗x^*, the predictive posterior distribution is obtained by marginalizing over θ\theta:

    p(y^∣x∗,X,Y)=∫p(y^∣x∗,θ)p(θ∣X,Y)dθ=Eθ∼p(θ∣X,Y)[f(x∗;θ)]p(\hat{y} \mid x^*, X, Y) = \int p(\hat{y} \mid x^*, \theta) p(\theta \mid X, Y) d\theta = \mathbb{E}_{\theta \sim p(\theta \mid X, Y)} [f(x^*; \theta)]

    In practice, DBAL computes posterior samples using Monte Carlo Dropout (MC-dropout) as approximate variational inference during inference, or via Deep Probabilistic Ensembles (DPEs), enabling uncertainty metrics such as predictive entropy or mutual information (BALD) to be evaluated on high-dimensional data.

  6. Knowl 6 — Density-Based and Core-Set Sample Selection in DeepAL

    model/method

    Density-based DeepAL strategies select query subsets by analyzing the geometric coverage and density distribution of the feature representation space:

    1. Core-Set Active Learning: Formulates query selection as finding a core subset L⊆U\mathcal{L} \subseteq \mathcal{U} that minimizes the maximum distance between any unlabeled sample and its nearest selected sample (a kk-Center clustering problem over neural network feature embeddings).
    2. Discriminative Active Learning (DAL): Casts active sample selection as a binary classification problem. A discriminator network is trained to differentiate between labeled and unlabeled instances. Unlabeled samples that the discriminator identifies as most distinct from the labeled pool are queried to align the empirical labeled distribution with the full unlabeled distribution.
    3. Farthest-First Active Learning (FF-Active): Utilizes farthest-first traversal across the activation space of intermediate representation layers to ensure selected instances maximize spatial dispersion across the data manifold.
  7. Knowl 7 — Data Expansion and Semi-Supervised Augmentation in DeepAL

    model/method

    To mitigate the data shortage inherent in deep networks trained on small active query sets, DeepAL incorporates unlabeled and synthetic data into the training cycle via three main strategies:

    1. Cost-Effective Active Learning (CEAL) Pseudo-Labeling: High-uncertainty samples are sent to the oracle for human labeling, while high-confidence unlabeled samples are automatically assigned pseudo-labels. Both sets are iteratively merged into the labeled pool to update the model.
    2. Generative Adversarial Active Learning (GAAL & BGADL):
      • GAAL: Uses Generative Adversarial Networks (GANs) to generate synthetic samples in high-information regions.
      • BGADL (Bayesian Generative Active Deep Learning): Combines Bayesian active learning, Auxiliary Classifier GANs (ACGAN), and Variational Autoencoders (VAE) to generate samples within disagreement regions across decision boundaries.
    3. Variational Adversarial Active Learning (VAAL & ARAL):
      • VAAL: Jointly trains a VAE on both labeled and unlabeled data alongside an adversarial discriminator that learns to distinguish between labeled and unlabeled latent embeddings; samples with high discriminator uncertainty are queried.
      • ARAL (Adversarial Representation Active Learning): Integrates adversarial feature representation learning with sample generation to train models on labeled, unlabeled, and synthetic data concurrently.
    4. Semi-Supervised Active Learning (SSAL): Performs unsupervised pre-training on all data prior to the active learning cycles, followed by supervised training on labeled data and semi-supervised training on the entire pool at each active iteration.
  8. Knowl 8 — Task-Agnostic Multi-Layer Loss Prediction in DeepAL

    model/method

    Standard uncertainty sampling evaluates only the final softmax output layer of a deep neural network, neglecting the uncertainty present in intermediate hierarchical feature representations.

    Learning Loss for Active Learning (LLAL) provides a task-agnostic active learning architecture by attaching a compact loss prediction module to intermediate hidden layers of the target deep neural network:

    • The loss prediction module takes multi-scale feature maps from several hidden layers as input.
    • It is trained jointly with the primary network to predict the target loss that an unlabeled input would produce if evaluated against its true label.
    • During the query step, unlabeled samples with the highest predicted loss are queried via a top-KK selection strategy.

    Because the loss prediction module learns to predict scalar loss values rather than task-specific probabilities, LLAL applies directly across multiple visual tasks including image classification, object detection, and human pose estimation.

  9. Knowl 9 — Automated Design of DeepAL via Reinforcement Learning and Neural Architecture Search

    model/method

    Automated DeepAL automates the design of acquisition functions and deep architectures instead of relying on manual heuristics:

    1. Reinforced Active Learning (RAL): Replaces fixed acquisition rules with a Bayesian Neural Network (BNN) policy network. The policy network receives prediction uncertainty distributions from a predictor BNN and adaptively updates sample selection strategies through reinforcement learning using reward feedback from the oracle.
    2. Deep Reinforcement Active Learning (DRAL): Applies an active reinforcement agent to sequential instance selection (e.g., in person re-identification), where the agent queries instances and refines its selection policy based on binary oracle feedback rewards.
    3. Incremental Neural Architecture Search (Active-iNAS): Integrates Neural Architecture Search (NAS) into the active learning loop, dynamically searching for optimal neural network architectures as the labeled dataset grows incrementally across active learning cycles.
  10. Knowl 10 — Deep Active Learning Stopping Criteria and Stabilizing Predictions

    model/method

    Determining when to terminate active annotation is vital in DeepAL to prevent premature termination (causing model performance degradation) or over-annotation (wasting human labeling budget):

    1. Predefined Stopping Criteria: Conventional DeepAL utilizes static stopping heuristics, including reaching a maximum number of iterations, exhausting a pre-allocated labeling budget, falling below a fixed threshold of classification accuracy change, or achieving a target accuracy value.
    2. Stabilizing Predictions (SP): Evaluates prediction stability across active cycles on an unannotated validation set (the "stop set") drawn from the unlabeled pool. Because the stop set does not require ground-truth annotations, it incurs zero extra labeling cost. The active query loop terminates when the model's predictions on the stop set stabilize across successive learning iterations.
  11. Knowl 11 — Evaluation Discrepancies and Random Sampling Baselines in DeepAL

    limitation

    Empirical evaluations in deep active learning literature face significant reproducibility challenges and inconsistent benchmarking practices:

    1. Random Sampling Baseline (RSB) Variance: Reported performance of the random sampling baseline varies substantially across studies under identical nominal settings. On CIFAR-10 with a 20% labeling budget, reported RSB accuracies diverge by up to 13% between papers.
    2. Inconsistent Method Replications: For the same benchmark setup (e.g., CIFAR-100 with VGG-16 backbone at 40% labeling budget), reported performance for identical DeepAL methods varies by up to 8% across independent publications.
    3. Contradictory Algorithmic Conclusions: Certain studies report that diversity-based active learning universally outperforms uncertainty-based sampling and that uncertainty sampling degrades below random sampling, whereas subsequent unified frameworks (such as multi-layer loss prediction) demonstrate superior performance for uncertainty-based approaches over both diversity methods and RSB.
    4. Dataset Sensitivity: On large datasets with minimal sample importance variance, training on small actively selected subsets provides negligible gains over random sampling, indicating that active subset selection is not universally advantageous across all dataset distributions.
  12. Knowl 12 — Cross-Domain Application Taxonomy of Deep Active Learning

    data/table

    DeepAL has been implemented across computer vision, natural language processing, biomedical analysis, and cyber-physical systems to reduce expert labeling costs in high-dimensional tasks. The table below outlines the core application taxonomy, representative tasks, publications, and benchmark datasets surveyed.

    Field Task Selected Methods Representative Datasets
    Vision Image Classification CEAL, WI-DL, DAL, DBAL CIFAR-10/100, MNIST, Caltech-256, PaviaU, BreaKHis
    Vision Object Detection Query-by-Committee, LiDAR-AL PASCAL VOC, KITTI, NACTI, NEU-DET
    Vision Semantic Segmentation FCN Suggestive Annotation, DASL SPIM, Confocal, LIDC-IDRI, MICCAI
    Vision Video Processing DeActive, DRAL Re-ID OPPORTUNITY, PRID, MARS, DukeMTMC
    NLP Machine Translation Curriculum AL, Parallel Corpus AL OPUS, UNPC, IWSLT, WMT
    NLP Text Classification Active CNN/RNN, Deep Bias AL AG News, DBPedia, Amazon Reviews, Yelp Review
    NLP Semantic Analysis Active Deep Networks (ADN), AL Fake News Movie Reviews (MR), KDnuggets Fake News, Liar
    NLP Information Extraction Tweet AL, Deep NER, ER Active CoNLL-2003, OntoNotes, NCBI Disease, DBLP
    NLP Question Answering Hidden-Space VQA, Dialogue AL Visual Genome, VQA, CMDC
    Other Robotics Wearables ActiveHARNet, Trajectory AL HHAR, Crazyflie, MIT-BIH ECG, MSP-Podcast

    This taxonomy demonstrates that DeepAL extends from low-dimensional biomedical and sensor signals (such as ECG and accelerometer streams) to complex multimodal and sequential structures (such as autonomous driving LiDAR point clouds, 3D medical CT scans, satellite remote sensing, and dialogue generation).

Coverage note — Specific individual empirical case studies from individual application papers cited in Section 4 were synthesized into the cross-domain application taxonomy rather than extracted as isolated knowls.

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Citation

MLA
Ren, P., et al. “A Survey of Deep Active Learning”. arXiv, 2020, http://arxiv.org/abs/2009.00236v2.
APA
Ren, P., Xiao, Y., Chang, X., Huang, P.-Y., Li, Z., Gupta, B. B., Chen, X., & Wang, X. (2020). A Survey of Deep Active Learning. arXiv. http://arxiv.org/abs/2009.00236v2
Chicago
Ren, P., Y. Xiao, X. Chang, et al. 2020. “A Survey of Deep Active Learning”. arXiv. http://arxiv.org/abs/2009.00236v2.
Harvard
Ren, P. et al. (2020) “A Survey of Deep Active Learning”, arXiv [Preprint]. Available at: http://arxiv.org/abs/2009.00236v2.
Vancouver
1. Ren P, Xiao Y, Chang X, Huang P-Y, Li Z, Gupta BB, Chen X, Wang X (2020) A Survey of Deep Active Learning. arXiv

BibTeX

@article{ren2020survey,
  title = {A Survey of Deep Active Learning},
  author = {Ren, Pengzhen and Xiao, Yun and Chang, Xiaojun and Huang, Po-Yao and Li, Zhihui and Gupta, Brij B. and Chen, Xiaojiang and Wang, Xin},
  year = {2020},
  journal = {arXiv},
  url = {http://arxiv.org/abs/2009.00236v2},
  eprint = {2009.00236}
}
Metadata:arXiv

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