# Is the interpretation of the "batch size" in policy gradient algorithms the number of trajectories sampled in VPG and TRPO?

I would like to shore up my interpretation of the concept of "batch size".

It is my understanding that in Vanilla Policy Gradients and TRPO, the "batch size" is the number of trajectories, $$\tau$$, that we sample before we make an update, as the update is based on the expected value of a trajectory. Is this correct?