Where: t represents the state parameter of the s partners,
that is wkO' wkh' vlO' Vlk' the initial value of each
parameters is 0; gst represents the parameters of the
s partners; Yit represents the state parameter of the center of
the eye of the i -th artificial fish.
Food concentration of the i -th artificial fish center line
of sight is hiy . If hiy satisfies (7), it shows that the center
position of the partner is not crowded, and is relatively safe,
then the artificial fish executes (8). On the contrary, it will
execute the foraging behavior