# American Institute of Mathematical Sciences

November  2020, 3(4): 219-227. doi: 10.3934/mfc.2020013

## Sketch-based image retrieval via CAT loss with elastic net regularization

 1 School of Statistics and Mathematics, Big Data and Educational Statistics Application Laboratory, Collaborative Innovation Development Center of Pearl River Delta Science & Technology Finance Industry, Guangdong University of Finance & Economics, Guangzhou, Guangdong, 510320, China 2 School of Statistics and Mathematics, Guangdong University of Finance & Economics, Guangzhou, Guangdong, 510320, China 3 Information Science School, Guangdong University of Finance & Economics, Guangzhou, Guangdong, 510320, China

* Corresponding author: Jia Cai

Received  December 2019 Revised  March 2020 Published  June 2020

Fund Project: The first author is supported partially by National Natural Science Foundation of China (11871167,11671171), Science and Technology Program of Guangzhou (201707010228), Special Support Plan for High-Level Talents of Guangdong Province (2019TQ05X571), Foundation of Guangdong Educational Committee (2019KZDZX1023), Project of Collaborative Innovation Development Center of Pearl River Delta Science & Technology Finance Industry (19XT01), National Social Science Foundation (19AJY027), Natural Science Foundation of Guangdong (2016A030313710)

Fine-grained sketch-based image retrieval (FG-SBIR) is an important problem that uses free-hand human sketch as queries to perform instance-level retrieval of photos. Human sketches are generally highly abstract and iconic, which makes FG-SBIR a challenging task. Existing FG-SBIR approaches using triplet loss with $\ell_2$ regularization or higher-order energy function to conduct retrieval performance, which neglect the feature gap between different domains (sketches, photos) and need to select the weight layer matrix. This yields high computational complexity. In this paper, we define a new CAT loss function with elastic net regularization based on attention model. It can close the feature gap between different subnetworks and embody the sparsity of the sketches. Experiments demonstrate that the proposed approach is competitive with state-of-the-art methods.

Citation: Jia Cai, Guanglong Xu, Zhensheng Hu. Sketch-based image retrieval via CAT loss with elastic net regularization. Mathematical Foundations of Computing, 2020, 3 (4) : 219-227. doi: 10.3934/mfc.2020013
##### References:
 [1] Y. Cao, C. Wang, L. Zhang and L. Zhang, Edgel index for large-scale sketch-based image search, in Proceedings CVPR IEEE Computer Society Conference on Computer Vision and Pattern Recognition, 2011,761–768. doi: 10.1109/CVPR.2011.5995460.  Google Scholar [2] Y. Cao, H. Wang, C. Wang, Z. Li, L. Zhang and L. Zhang, Mindfinder: Interactive sketch-based image search on millions of images, in Proceedings of the 18th ACM International Conference on Multimedia, 2010, 1605–1608. doi: 10.1145/1873951.1874299.  Google Scholar [3] S. Chopra, R. Hadsell and Y. LeCun, Learning a similarity metric discriminatively, with application to face verification, in Proceedings CVPR IEEE Computer Society Conference on Computer Vision and Pattern Recognition, 2005,539–546. doi: 10.1109/CVPR.2005.202.  Google Scholar [4] N. Dalal and B. Triggs, Histograms of oriented gradients for human detection, in Proceedings CVPR IEEE Computer Society Conference on Computer Vision and Pattern Recognition, 2005,886–893. doi: 10.1109/CVPR.2005.177.  Google Scholar [5] A. Del Bimbo and P. Pala, Visual image retrieval by elastic matching of user sketches, IEEE Transactions on Pattern Analysis and Machine Intelligence, 19 (1997), 121-132.   Google Scholar [6] M. Eitz, J. Hays and M. Alexa, How do humans sketch objects?, ACM Transactions on Graphics (TOG), 31 (2012), 1-10.  doi: 10.1145/2185520.2185540.  Google Scholar [7] R. Hadsell, S. Chopra and Y. LeCun, Dimensionality reduction by learning an invariant mapping, in Proceedings CVPR IEEE Computer Society Conference on Computer Vision and Pattern Recognition, 2006, 1735–1742. doi: 10.1109/CVPR.2006.100.  Google Scholar [8] R. Hu, M. Barnard and J. Collomosse, Gradient field descriptor for sketch based retrieval and localization, in Proceedings of IEEE International Conference on Image Processing, 2010, 1025–1028. doi: 10.1109/ICIP.2010.5649331.  Google Scholar [9] R. Hu and J. Collomosse, A performance evaluation of gradient field hog descriptor for sketch based image retrieval, Computer Vision and Image Understanding, 117 (2013), 790-806.  doi: 10.1016/j.cviu.2013.02.005.  Google Scholar [10] T. Kato, T. Kurita, N. Otsu and K. Hirata, A sketch retrieval method for full color image database-query by visual example, in Proceedings of 11th IAPR International Conference on Pattern Recognition, 1992,530–533. doi: 10.1109/ICPR.1992.201616.  Google Scholar [11] B. Klare, Z. Li and A. K. Jain, Matching forensic sketches to mug shot photos, IEEE Transactions on Pattern Analysis and Machine Intelligence, 33 (2010), 639-646.  doi: 10.1109/TPAMI.2010.180.  Google Scholar [12] A. Krizhevsky, I. Sutskever and G. E. Hinton, Imagenet classification with deep convolutional neural networks, in Advances in Neural Information Processing Systems, (2012), 1097–1105. doi: 10.1145/3065386.  Google Scholar [13] Y. Li, T. M. Hospedales, Y. Z. Song and S. Gong, Fine-grained sketch-based image retrieval by matching deformable part models, 2014. Google Scholar [14] Y. Li, T. M. Hospedales, Y. Z. Song and S. Gong, Free-hand sketch recognition by multi-kernel feature learning, Computer Vision and Image Understanding, 137 (2015), 1-11.  doi: 10.1016/j.cviu.2015.02.003.  Google Scholar [15] K. Li, K. Pang, Y. Z. Song, T. Hospedales, H. Zhang and Y. Hu, Fine-grained sketch-based image retrieval: The role of part-aware attributes, in 2016 IEEE Winter Conference on Applications of Computer Vision (WACV), 2016, 1–9. doi: 10.1109/WACV.2016.7477615.  Google Scholar [16] Y. L. Lin, C. Y. Huang, H. J. Wang and W. Hsu, 3d sub-query expansion for improving sketch-based multi-view image retrieval, in Proceedings of the IEEE International Conference on Computer Vision, 2013, 3495–3502. doi: 10.1109/ICCV.2013.434.  Google Scholar [17] L. Liu, F. Shen, Y. Shen, X. Liu and L. Shao, Deep sketch hashing: Fast free-hand sketch-based image retrieval, in Proceedings of the IEEE Conference on Computer Vision and Pattern Recognition, 2017, 2862–2871. doi: 10.1109/CVPR.2017.247.  Google Scholar [18] S. Ouyang, T. M. Hospedales, Y. Z. Song and X. Li, Forgetmenot: Memory-aware forensic facial sketch matching, in Proceedings of the IEEE Conference on Computer Vision and Pattern Recognition, 2016, 5571–5579. doi: 10.1109/CVPR.2016.601.  Google Scholar [19] K. Pang, Y. Z. Song, T. Xiang and T. M. Hospedales, Cross-domain generative learning for fine-grained sketch-based image retrieval, in Proceedings of the British Machine Vision Conference (BMVC), 2017, 1–12. doi: 10.5244/C.31.46.  Google Scholar [20] P. Sangkloy, N. Burnell, C. Ham and J. Hays, The sketchy database: Learning to retrieve badly drawn bunnies, ACM Transactions on Graphics (TOG), 35 (2016), 1-12.  doi: 10.1145/2897824.2925954.  Google Scholar [21] R. G. Schneider and T. Tuytelaars, Sketch classification and classification-driven analysis using Fisher vectors, ACM Transactions on Graphics (TOG), 33 (2014), 1-9.  doi: 10.1145/2661229.2661231.  Google Scholar [22] S. Sclaroff, Deformable prototypes for encoding shape categories in image databases, Pattern Recognition, 30 (1997), 627-641.  doi: 10.1016/S0031-3203(96)00108-2.  Google Scholar [23] O. Seddati, S. Dupont and S. Mahmoudi, Triplet networks feature masking for sketch-based image retrieval, in International Conference Image Analysis and Recognition, 2017,296–303. doi: 10.1007/978-3-319-59876-5_33.  Google Scholar [24] K. Simonyan and A. Zisserman, Very deep convolutional networks for large-scale image recognition, preprint, arXiv: 1409.1556. Google Scholar [25] J. Song, Y. Z. Song, T. Xiang, T. M. Hospedales and X. Ruan, Deep multi-task attribute-driven ranking for fine-grained sketch-based image retrieval, in Proceedings of the British Machine Vision Conference (BMVC), 2016,132.1–132.11. doi: 10.5244/C.30.132.  Google Scholar [26] J. Song, Q. Yu, Y. Z. Song, T. Xiang and T. M. Hospedales, Deep spatial-semantic attention for fine-grained sketch-based image retrieval, in Proceedings of the IEEE International Conference on Computer Vision, 2017, 5551–5560. doi: 10.1109/ICCV.2017.592.  Google Scholar [27] C. Szegedy, et al., Going deeper with convolutions, in Proceedings of the IEEE Conference on Computer Vision and Pattern Recognition, 2015, 1–9. doi: 10.1109/CVPR.2015.7298594.  Google Scholar [28] O. Vinyals, A. Toshev, S. Bengio and D. Erhan, Show and tell: A neural image caption generator, in Proceedings of the IEEE Conference on Computer Vision and Pattern Recognition, 2015, 3156–3164. doi: 10.1109/CVPR.2015.7298935.  Google Scholar [29] F. Wang, L. Kang and Y. Li, Sketch-based 3d shape retrieval using convolutional neural networks, in Proceedings of the IEEE Conference on Computer Vision and Pattern Recognition, 2015, 1875–1883. doi: 10.1109/CVPR.2015.7298797.  Google Scholar [30] J. Wang, Y. Song, T. Leung, C. Rosenberg, J. Wang, J. Philbin, B. Chen and Y. Wu, Learning fine-grained image similarity with deep ranking, in Proceedings of the IEEE Conference on Computer Vision and Pattern Recognition, 2014, 1386–1393. doi: 10.1109/CVPR.2014.180.  Google Scholar [31] A. Yu and K. Grauman, Fine-grained visual comparisons with local learning, in Proceedings of the IEEE Conference on Computer Vision and Pattern Recognition, 2014,192–199. doi: 10.1109/CVPR.2014.32.  Google Scholar [32] Q. Yu, F. Liu, Y. Z. Song, T. Xiang, T. M. Hospedales and C. C. Loy, Sketch me that shoe, in Proceedings of the IEEE Conference on Computer Vision and Pattern Recognition, 2016,799–807. doi: 10.1007/s11263-016-0932-3.  Google Scholar [33] Q. Yu, Y. Yang, Y. Z. Song, T. Xiang and T. Hospedales, Sketch-a-net that beats humans, in Proceedings of the British Machine Vision Conference (BMVC), 2015, 7–10. doi: 10.1007/s11263-016-0932-3.  Google Scholar [34] H. Zhang, C. Zhang, and M. Wu, Sketch-based cross-domain image retrieval via heterogeneous network, in 2017 IEEE Visual Communications and Image Processing (VCIP), 2017, 1–4. doi: 10.1109/VCIP.2017.8305153.  Google Scholar [35] H. Zou and T. Hastie, Regularization and variable selection via the elastic net, J. Roy. Statist. Soc. Ser. B, 67 (2005), 301-320.  doi: 10.1111/j.1467-9868.2005.00503.x.  Google Scholar

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##### References:
 [1] Y. Cao, C. Wang, L. Zhang and L. Zhang, Edgel index for large-scale sketch-based image search, in Proceedings CVPR IEEE Computer Society Conference on Computer Vision and Pattern Recognition, 2011,761–768. doi: 10.1109/CVPR.2011.5995460.  Google Scholar [2] Y. Cao, H. Wang, C. Wang, Z. Li, L. Zhang and L. Zhang, Mindfinder: Interactive sketch-based image search on millions of images, in Proceedings of the 18th ACM International Conference on Multimedia, 2010, 1605–1608. doi: 10.1145/1873951.1874299.  Google Scholar [3] S. Chopra, R. Hadsell and Y. LeCun, Learning a similarity metric discriminatively, with application to face verification, in Proceedings CVPR IEEE Computer Society Conference on Computer Vision and Pattern Recognition, 2005,539–546. doi: 10.1109/CVPR.2005.202.  Google Scholar [4] N. Dalal and B. Triggs, Histograms of oriented gradients for human detection, in Proceedings CVPR IEEE Computer Society Conference on Computer Vision and Pattern Recognition, 2005,886–893. doi: 10.1109/CVPR.2005.177.  Google Scholar [5] A. Del Bimbo and P. Pala, Visual image retrieval by elastic matching of user sketches, IEEE Transactions on Pattern Analysis and Machine Intelligence, 19 (1997), 121-132.   Google Scholar [6] M. Eitz, J. Hays and M. Alexa, How do humans sketch objects?, ACM Transactions on Graphics (TOG), 31 (2012), 1-10.  doi: 10.1145/2185520.2185540.  Google Scholar [7] R. Hadsell, S. Chopra and Y. LeCun, Dimensionality reduction by learning an invariant mapping, in Proceedings CVPR IEEE Computer Society Conference on Computer Vision and Pattern Recognition, 2006, 1735–1742. doi: 10.1109/CVPR.2006.100.  Google Scholar [8] R. Hu, M. Barnard and J. Collomosse, Gradient field descriptor for sketch based retrieval and localization, in Proceedings of IEEE International Conference on Image Processing, 2010, 1025–1028. doi: 10.1109/ICIP.2010.5649331.  Google Scholar [9] R. Hu and J. Collomosse, A performance evaluation of gradient field hog descriptor for sketch based image retrieval, Computer Vision and Image Understanding, 117 (2013), 790-806.  doi: 10.1016/j.cviu.2013.02.005.  Google Scholar [10] T. Kato, T. Kurita, N. Otsu and K. Hirata, A sketch retrieval method for full color image database-query by visual example, in Proceedings of 11th IAPR International Conference on Pattern Recognition, 1992,530–533. doi: 10.1109/ICPR.1992.201616.  Google Scholar [11] B. Klare, Z. Li and A. K. Jain, Matching forensic sketches to mug shot photos, IEEE Transactions on Pattern Analysis and Machine Intelligence, 33 (2010), 639-646.  doi: 10.1109/TPAMI.2010.180.  Google Scholar [12] A. Krizhevsky, I. Sutskever and G. E. Hinton, Imagenet classification with deep convolutional neural networks, in Advances in Neural Information Processing Systems, (2012), 1097–1105. doi: 10.1145/3065386.  Google Scholar [13] Y. Li, T. M. Hospedales, Y. Z. Song and S. Gong, Fine-grained sketch-based image retrieval by matching deformable part models, 2014. Google Scholar [14] Y. Li, T. M. Hospedales, Y. Z. Song and S. Gong, Free-hand sketch recognition by multi-kernel feature learning, Computer Vision and Image Understanding, 137 (2015), 1-11.  doi: 10.1016/j.cviu.2015.02.003.  Google Scholar [15] K. Li, K. Pang, Y. Z. Song, T. Hospedales, H. Zhang and Y. Hu, Fine-grained sketch-based image retrieval: The role of part-aware attributes, in 2016 IEEE Winter Conference on Applications of Computer Vision (WACV), 2016, 1–9. doi: 10.1109/WACV.2016.7477615.  Google Scholar [16] Y. L. Lin, C. Y. Huang, H. J. Wang and W. Hsu, 3d sub-query expansion for improving sketch-based multi-view image retrieval, in Proceedings of the IEEE International Conference on Computer Vision, 2013, 3495–3502. doi: 10.1109/ICCV.2013.434.  Google Scholar [17] L. Liu, F. Shen, Y. Shen, X. Liu and L. Shao, Deep sketch hashing: Fast free-hand sketch-based image retrieval, in Proceedings of the IEEE Conference on Computer Vision and Pattern Recognition, 2017, 2862–2871. doi: 10.1109/CVPR.2017.247.  Google Scholar [18] S. Ouyang, T. M. Hospedales, Y. Z. Song and X. Li, Forgetmenot: Memory-aware forensic facial sketch matching, in Proceedings of the IEEE Conference on Computer Vision and Pattern Recognition, 2016, 5571–5579. doi: 10.1109/CVPR.2016.601.  Google Scholar [19] K. Pang, Y. Z. Song, T. Xiang and T. M. Hospedales, Cross-domain generative learning for fine-grained sketch-based image retrieval, in Proceedings of the British Machine Vision Conference (BMVC), 2017, 1–12. doi: 10.5244/C.31.46.  Google Scholar [20] P. Sangkloy, N. Burnell, C. Ham and J. Hays, The sketchy database: Learning to retrieve badly drawn bunnies, ACM Transactions on Graphics (TOG), 35 (2016), 1-12.  doi: 10.1145/2897824.2925954.  Google Scholar [21] R. G. Schneider and T. Tuytelaars, Sketch classification and classification-driven analysis using Fisher vectors, ACM Transactions on Graphics (TOG), 33 (2014), 1-9.  doi: 10.1145/2661229.2661231.  Google Scholar [22] S. Sclaroff, Deformable prototypes for encoding shape categories in image databases, Pattern Recognition, 30 (1997), 627-641.  doi: 10.1016/S0031-3203(96)00108-2.  Google Scholar [23] O. Seddati, S. Dupont and S. Mahmoudi, Triplet networks feature masking for sketch-based image retrieval, in International Conference Image Analysis and Recognition, 2017,296–303. doi: 10.1007/978-3-319-59876-5_33.  Google Scholar [24] K. Simonyan and A. Zisserman, Very deep convolutional networks for large-scale image recognition, preprint, arXiv: 1409.1556. Google Scholar [25] J. Song, Y. Z. Song, T. Xiang, T. M. Hospedales and X. Ruan, Deep multi-task attribute-driven ranking for fine-grained sketch-based image retrieval, in Proceedings of the British Machine Vision Conference (BMVC), 2016,132.1–132.11. doi: 10.5244/C.30.132.  Google Scholar [26] J. Song, Q. Yu, Y. Z. Song, T. Xiang and T. M. Hospedales, Deep spatial-semantic attention for fine-grained sketch-based image retrieval, in Proceedings of the IEEE International Conference on Computer Vision, 2017, 5551–5560. doi: 10.1109/ICCV.2017.592.  Google Scholar [27] C. Szegedy, et al., Going deeper with convolutions, in Proceedings of the IEEE Conference on Computer Vision and Pattern Recognition, 2015, 1–9. doi: 10.1109/CVPR.2015.7298594.  Google Scholar [28] O. Vinyals, A. Toshev, S. Bengio and D. Erhan, Show and tell: A neural image caption generator, in Proceedings of the IEEE Conference on Computer Vision and Pattern Recognition, 2015, 3156–3164. doi: 10.1109/CVPR.2015.7298935.  Google Scholar [29] F. Wang, L. Kang and Y. Li, Sketch-based 3d shape retrieval using convolutional neural networks, in Proceedings of the IEEE Conference on Computer Vision and Pattern Recognition, 2015, 1875–1883. doi: 10.1109/CVPR.2015.7298797.  Google Scholar [30] J. Wang, Y. Song, T. Leung, C. Rosenberg, J. Wang, J. Philbin, B. Chen and Y. Wu, Learning fine-grained image similarity with deep ranking, in Proceedings of the IEEE Conference on Computer Vision and Pattern Recognition, 2014, 1386–1393. doi: 10.1109/CVPR.2014.180.  Google Scholar [31] A. Yu and K. Grauman, Fine-grained visual comparisons with local learning, in Proceedings of the IEEE Conference on Computer Vision and Pattern Recognition, 2014,192–199. doi: 10.1109/CVPR.2014.32.  Google Scholar [32] Q. Yu, F. Liu, Y. Z. Song, T. Xiang, T. M. Hospedales and C. C. Loy, Sketch me that shoe, in Proceedings of the IEEE Conference on Computer Vision and Pattern Recognition, 2016,799–807. doi: 10.1007/s11263-016-0932-3.  Google Scholar [33] Q. Yu, Y. Yang, Y. Z. Song, T. Xiang and T. Hospedales, Sketch-a-net that beats humans, in Proceedings of the British Machine Vision Conference (BMVC), 2015, 7–10. doi: 10.1007/s11263-016-0932-3.  Google Scholar [34] H. Zhang, C. Zhang, and M. Wu, Sketch-based cross-domain image retrieval via heterogeneous network, in 2017 IEEE Visual Communications and Image Processing (VCIP), 2017, 1–4. doi: 10.1109/VCIP.2017.8305153.  Google Scholar [35] H. Zou and T. Hastie, Regularization and variable selection via the elastic net, J. Roy. Statist. Soc. Ser. B, 67 (2005), 301-320.  doi: 10.1111/j.1467-9868.2005.00503.x.  Google Scholar
Architecture of the model
Examples of stroke removal
Network structure
 $Index$ Layer Type Filter size Filter number Stride Pad Output size $0$ $Input$ $-$ $-$ $-$ $-$ $225\times225$ $1$ $L1$ $Conv$ $15\times15$ 64 3 0 $71\times71$ $2$ $ReLU$ $-$ $-$ $-$ $-$ $71\times71$ $3$ Maxpool $3\times3$ $-$ 2 0 $35\times35$ $4$ $L2$ $Conv$ $5\times5$ 128 1 0 $31\times31$ $5$ $ReLU$ $-$ $-$ $-$ $-$ $31\times31$ $6$ Maxpool $3\times3$ $-$ 2 0 $15\times15$ $7$ $L3$ $Conv$ $3\times3$ 256 1 1 $15\times15$ $8$ $ReLU$ $-$ $-$ $-$ $-$ $15\times15$ $9$ $L4$ $Conv$ $3\times3$ 256 1 1 $15\times15$ $10$ $ReLU$ $-$ $-$ $-$ $-$ $15\times15$ $11$ $L5$ $Conv$ $3\times3$ 256 1 1 $15\times15$ $12$ $ReLU$ $-$ $-$ $-$ $-$ $15\times15$ $13$ Maxpool $3\times3$ $-$ 2 0 $7\times7$ $14$ $L6$ $Conv( = FC)$ $7\times7$ 512 1 $0$ $1\times1$ $15$ $ReLU$ $-$ $-$ $-$ $-$ $1\times1$ $16$ Dropout (0.55) $-$ $-$ $-$ $-$ $1\times1$ $17$ $L7$ $Conv( = FC)$ $1\times1$ 256 1 $0$ $1\times1$ $18$ $ReLU$ $-$ $-$ $-$ $-$ $1\times1$ $19$ Dropout (0.55) $-$ $-$ $-$ $-$ $1\times1$
 $Index$ Layer Type Filter size Filter number Stride Pad Output size $0$ $Input$ $-$ $-$ $-$ $-$ $225\times225$ $1$ $L1$ $Conv$ $15\times15$ 64 3 0 $71\times71$ $2$ $ReLU$ $-$ $-$ $-$ $-$ $71\times71$ $3$ Maxpool $3\times3$ $-$ 2 0 $35\times35$ $4$ $L2$ $Conv$ $5\times5$ 128 1 0 $31\times31$ $5$ $ReLU$ $-$ $-$ $-$ $-$ $31\times31$ $6$ Maxpool $3\times3$ $-$ 2 0 $15\times15$ $7$ $L3$ $Conv$ $3\times3$ 256 1 1 $15\times15$ $8$ $ReLU$ $-$ $-$ $-$ $-$ $15\times15$ $9$ $L4$ $Conv$ $3\times3$ 256 1 1 $15\times15$ $10$ $ReLU$ $-$ $-$ $-$ $-$ $15\times15$ $11$ $L5$ $Conv$ $3\times3$ 256 1 1 $15\times15$ $12$ $ReLU$ $-$ $-$ $-$ $-$ $15\times15$ $13$ Maxpool $3\times3$ $-$ 2 0 $7\times7$ $14$ $L6$ $Conv( = FC)$ $7\times7$ 512 1 $0$ $1\times1$ $15$ $ReLU$ $-$ $-$ $-$ $-$ $1\times1$ $16$ Dropout (0.55) $-$ $-$ $-$ $-$ $1\times1$ $17$ $L7$ $Conv( = FC)$ $1\times1$ 256 1 $0$ $1\times1$ $18$ $ReLU$ $-$ $-$ $-$ $-$ $1\times1$ $19$ Dropout (0.55) $-$ $-$ $-$ $-$ $1\times1$
Comparative results against baselines on QMUL-shoe dataset
 QMUL-shoe $Acc.@1$ $Acc.@10$ HOG+BoW+RankSVM 17.39% 67.83% Deep ISN 20.00% 62.61% Triplet SN 52.17% 92.17% Triplet DSSA 61.74% 94.78% Our model 56.52% 96.52%
 QMUL-shoe $Acc.@1$ $Acc.@10$ HOG+BoW+RankSVM 17.39% 67.83% Deep ISN 20.00% 62.61% Triplet SN 52.17% 92.17% Triplet DSSA 61.74% 94.78% Our model 56.52% 96.52%
Comparative results against baselines on QMUL-chair dataset
 QMUL-chair $Acc.@1$ $Acc.@10$ HOG+BoW+RankSVM 28.87% 67.01% Deep ISN 47.42% 82.47% Triplet SN 72.16% 98.96% Triplet DSSA 81.44% 95.88% Our model 81.44% 98.97%
 QMUL-chair $Acc.@1$ $Acc.@10$ HOG+BoW+RankSVM 28.87% 67.01% Deep ISN 47.42% 82.47% Triplet SN 72.16% 98.96% Triplet DSSA 81.44% 95.88% Our model 81.44% 98.97%
Comparative results against baselines on QMUL-handbag dataset
 QMUL-handbag $Acc.@1$ $Acc.@10$ HOG+BoW+RankSVM 2.38% 10.71% Deep ISN 9.52% 44.05% Triplet SN 39.88% 82.14% Triplet DSSA 49.40% 82.74% Our model 54.76% 88.69%
 QMUL-handbag $Acc.@1$ $Acc.@10$ HOG+BoW+RankSVM 2.38% 10.71% Deep ISN 9.52% 44.05% Triplet SN 39.88% 82.14% Triplet DSSA 49.40% 82.74% Our model 54.76% 88.69%
Contributions of different components
 QMUL-shoe $Acc.@1$ $Acc.@10$ Triplet loss+data aug 50.43% 93.91% CAT loss+no data aug 49.57% 94.78% Our model 54.78% 96.52% QMUL-chair $Acc.@1$ $Acc.@10$ Triplet loss+data aug 78.35% 97.94% CAT loss+no data aug 76.29% 96.91% Our model 81.44% 98.97% QMUL-handbag $Acc.@1$ $Acc.@10$ Triplet loss+data aug 51.19% 86.31% CAT loss+no data aug 51.79% 86.90% Our model 54.76% 88.69%
 QMUL-shoe $Acc.@1$ $Acc.@10$ Triplet loss+data aug 50.43% 93.91% CAT loss+no data aug 49.57% 94.78% Our model 54.78% 96.52% QMUL-chair $Acc.@1$ $Acc.@10$ Triplet loss+data aug 78.35% 97.94% CAT loss+no data aug 76.29% 96.91% Our model 81.44% 98.97% QMUL-handbag $Acc.@1$ $Acc.@10$ Triplet loss+data aug 51.19% 86.31% CAT loss+no data aug 51.79% 86.90% Our model 54.76% 88.69%
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