### what is "set_verbose"command in buchberger algorithm?

Hello
I computed buchberger algorithm as
R.<x,y,z>=PolynomialRing(QQ,3)
I=ideal(x^6-y^2+z, z^3+y^2)
set_verbose(3)
I.groebner_basis('toy:buchberger')
(x^6 - y^2 + z, z^3 + y^2) => 0
G: set([x^6 - y^2 + z, z^3 + y^2])

(z^3 + y^2, x^6 - y^2 + z) => 0
G: set([x^6 - y^2 + z, z^3 + y^2])

2 reductions to zero.
[x^6 - y^2 + z, z^3 + y^2]
I just want to know what is "set_verbose(3)" command for in this? also "toy:" ...
thank you