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(model\056) -544.984 (Extensi) 25.0038 (v) 14.9865 (e) -327.977 (e) 15.0137 (xperimental) -329 (results) -328.009 (sho) 25.012 (w) -328.015 (that) -328.004 (the) ] TJ T* [ (strate) 15 (gy) -249.978 (of) -249.992 (\050A\051) -250.017 (is) -250.008 (most) -250 (ef) 25.0174 (fecti) 25.0174 (v) 14.9865 (e\056) ] TJ /R11 9.9626 Tf 17.4891 TL T* [ (feature) -383.982 (that) -383.019 (should) -383.98 (ha) 19.9967 (v) 14.9828 (e) -384.019 (small) -383.985 (intra\055class) -383.015 (and) -384.009 (lar) 17.997 (ge) -384.014 (inter) 20.0065 (\055) ] TJ 11.9551 TL T* [ (class) -249.988 (distance\056) ] TJ 11.9551 -13.2898 Td [ (There) -242.001 (are) -242.011 (tw) 10.0081 (o) -241.994 (main) -242.018 (l) 0.98758 (ines) -241.984 (of) -241.999 (research) -242.014 (to) -241.989 (train) -241.989 (DCNNs) -242.009 (for) ] TJ -11.9551 -11.9551 Td [ (f) 9.99588 (ace) -306 (recognition\056) -476.982 (Some) -304.981 (train) -306.018 (a) -305.993 (mult) 1.00964 (i\055class) -306.013 <636c61737369026572> -306.003 (which) ] TJ T* [ (can) -293.993 (separate) -295.012 (dif) 24.986 (ferent) -293.993 (identities) -293.985 (in) -294.02 (the) -295 (training) -294 (set\054) -304.998 (such) -295 (by) ] TJ T* [ (using) -327.994 (a) -327.989 (softmax) -327.997 <636c61737369026572> -328 (\133) ] TJ ET Q 0 1 0 rg q 10 0 0 10 0 0 cm BT /R11 9.9626 Tf 1 0 0 1 418.779 212.507 Tm (31) Tj ET Q 0 g q 10 0 0 10 0 0 cm BT /R11 9.9626 Tf 1 0 0 1 428.742 212.507 Tm (\054) Tj ET Q 0 1 0 rg q 10 0 0 10 0 0 cm BT /R11 9.9626 Tf 1 0 0 1 434.51 212.507 Tm (22) Tj ET Q 0 g q 10 0 0 10 0 0 cm BT /R11 9.9626 Tf 1 0 0 1 444.473 212.507 Tm (\054) Tj ET Q 0 1 0 rg q 10 0 0 10 0 0 cm BT /R11 9.9626 Tf 1 0 0 1 450.231 212.507 Tm (3) Tj ET Q 0 g q 10 0 0 10 0 0 cm BT /R11 9.9626 Tf 1 0 0 1 455.213 212.507 Tm [ (\135\054) -347 (and) -328.019 (the) -328.994 (others) -328.009 (learn) ] TJ -146.35 -11.9551 Td [ (directly) -296.009 (an) -295.99 (embedding\054) -307.988 (such) -296.019 (as) -295.99 (the) -295.98 (triplet) -296.005 (loss) -296.005 (\133) ] TJ ET Q 0 1 0 rg q 10 0 0 10 0 0 cm BT /R11 9.9626 Tf 1 0 0 1 500.532 200.552 Tm (27) Tj ET Q 0 g q 10 0 0 10 0 0 cm BT /R11 9.9626 Tf 1 0 0 1 510.495 200.552 Tm [ (\135\056) -448.004 (Based) ] TJ -201.633 -11.9559 Td [ (on) -239.009 (the) -237.992 (lar) 17.997 (ge\055scale) -238.982 (training) -238.99 (data) -237.995 (and) -239.014 (the) -237.99 (elaborate) -239.014 (DCNN) -239 (ar) 19.9869 (\055) ] TJ 11.9551 TL T* [ (chitectures\054) -431.987 (both) -395.99 (the) -396.005 (softmax\055loss\055based) -395.998 (methods) -396.017 (\133) ] TJ ET Q 0 1 0 rg q 10 0 0 10 0 0 cm BT /R11 9.9626 Tf 1 0 0 1 518.485 176.641 Tm (3) Tj ET Q 0 g q 10 0 0 10 0 0 cm BT /R11 9.9626 Tf 1 0 0 1 523.466 176.641 Tm [ (\135) -396.017 (and) ] TJ -214.604 -11.9547 Td [ (the) -211.016 (triplet\055loss\055based) -211.011 (methods) -210.009 (\133) ] TJ ET Q 0 1 0 rg q 10 0 0 10 0 0 cm BT /R11 9.9626 Tf 1 0 0 1 433.036 164.686 Tm (27) Tj ET Q 0 g q 10 0 0 10 0 0 cm BT /R11 9.9626 Tf 1 0 0 1 442.999 164.686 Tm [ (\135) -210.989 (can) -210.989 (obtain) -211 (e) 15.0122 (xcellent) -211.004 (per) 19.9918 (\055) ] TJ -134.137 -11.9551 Td [ (formance) -319.003 (on) -318.016 (f) 9.99588 (ace) -319.018 (recognition\056) -515.992 (Ho) 24.986 (we) 25.0154 (v) 14.9828 (er) 39.9835 (\054) -335.978 (both) -318.981 (the) -318.996 (softmax) ] TJ 11.9551 TL T* [ (loss) -256.991 (and) -257.011 (the) -257.009 (triplet) -256.989 (loss) -256.011 (ha) 19.9967 (v) 14.9828 (e) -256.982 (some) -256.996 (dra) 15.0122 (wbacks\056) -330.989 (F) 14.9926 (or) -257.016 (the) -257.006 (soft\055) ] TJ T* [ (max) -356.987 (loss\072) -525.018 (\0501\051) -357.982 (t) 0.98758 (he) -358.019 (size) -356.994 (of) -358.019 (the) -356.989 (linear) -356.989 (transformation) -358.019 (matrix) ] TJ /R24 9.9626 Tf 11.9559 TL T* [ (W) -0.40189 ] TJ /R26 9.9626 Tf 15.7629 0 Td [ (2) -0.70086 ] TJ /R28 9.9626 Tf 11.6109 0 Td [ (R) -0.20095 ] TJ /R30 6.9738 Tf 7.19609 3.61602 Td [ (d) -0.70017 ] TJ 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