rollout accepts a list of models of length nroll

doc/changelog.rst

@@ -16,6 +16,7 @@ Python bindings
 - Added ``bind`` method and removed id attribute from :ref:`mjSpec` objects. Using ids is error prone in scenarios of repeated attachment and
   detachment. Python users are encouraged to use names for unique identification of model elements.
 - Removed ``nroll`` argument from :ref:`rollout<PyRollout>` because its value can always be inferred.
+- :ref:`rollout<PyRollout>` can now accept lists of MjModel of length ``nroll``.
 
 Bug fixes
 ^^^^^^^^^

doc/python.rst

@@ -700,6 +700,7 @@ states and sensor values. The basic usage form is
 
    state, sensordata = rollout.rollout(model, data, initial_state, control)
 
+``model`` is either a single instance of MjModel or a list of compatible MjModel of length ``nroll``.
 ``initial_state`` is an ``nroll x nstate`` array, with ``nroll`` initial states of size ``nstate``, where
 ``nstate = mj_stateSize(model, mjtState.mjSTATE_FULLPHYSICS)`` is the size of the
 :ref:`full physics state<geFullPhysics>`. ``control`` is a ``nroll x nstep x ncontrol`` array of controls. Controls are