Table 9 Performance of the GRU-based classifier in signer-independent mode when trained with data from 4 signers and tested with data from 1 signer.

0.80

1.00

0.89

35

0.17

0.25

0.20

40

0.30

0.94

0.45

36

0.42

0.35

0.38

37

0.79

1.00

0.89

31

0.14

0.03

0.05

35

1.00

0.09

0.17

33

0.73

1.00

0.84

38

0.48

0.30

0.37

37

0.71

0.65

0.68

37

0.36

0.14

0.20

35

0.30

0.38

0.34

37

0.00

0.00

0.00

38

0.38

1.00

0.55

37

0.48

0.30

0.37

37

0.84

0.73

0.78

37

0.50

0.12

0.20

32

0.38

0.17

0.23

36

0.66

1.00

0.80

37

0.17

0.06

0.09

35

0.48

720

0.48

0.48

0.42

720

0.47

0.48

0.42

720