rmerBlock should contain two self-attention layers.
positional_embeddings — (str, optional):
The type of positional embeddings to apply to the sequence input before passing use.
num_positional_embeddings — (int, optional):
The maximum length of the sequence over which to apply positional embeddings.    A Transformer model for video-like data.  forward  < source > ( hidden_states: FloatTensor encoder_hidden_states: Optional = None timestep: Opti