  We develop an adversarial-reinforcement learning scheme for microswimmers in
statistically homogeneous and isotropic turbulent fluid flows, in both two (2D)
and three dimensions (3D). We show that this scheme allows microswimmers to
find non-trivial paths, which enable them to reach a target on average in less
time than a naive microswimmer, which tries, at any instant of time and at a
given position in space, to swim in the direction of the target. We use
pseudospectral direct numerical simulations (DNSs) of the 2D and 3D
(incompressible) Navier-Stokes equations to obtain the turbulent flows. We then
introduce passive microswimmers that try to swim along a given direction in
these flows; the microswimmers do not affect the flow, but they are advected by
it.
