tf_agents.trajectories.trajectory.first

Create a Trajectory transitioning between StepTypes FIRST and MID.

tf_agents.trajectories.trajectory.first(
    observation, action, policy_info, reward, discount
)

All inputs may be batched.

The input discount is used to infer the outer shape of the inputs, as it is always expected to be a singleton array with scalar inner shape.

Args
`observation`	(possibly nested tuple of) `Tensor` or `np.ndarray`; all shaped `[B, ...]`, `[T, ...]`, or `[B, T, ...]`.
`action`	(possibly nested tuple of) `Tensor` or `np.ndarray`; all shaped `[B, ...]`, `[T, ...]`, or `[B, T, ...]`.
`policy_info`	(possibly nested tuple of) `Tensor` or `np.ndarray`; all shaped `[B, ...]`, `[T, ...]`, or `[B, T, ...]`.
`reward`	(possibly nested tuple of) `Tensor` or `np.ndarray`; all shaped `[B, ...]`, `[T, ...]`, or `[B, T, ...]`.
`discount`	A floating point vector `Tensor` or `np.ndarray`; shaped `[B]`, `[T]`, or `[B, T]` (optional).

Returns
A `Trajectory` instance.

Args