    :attr:`format` (:attr:`str`): Format of the tensor. It must include 'B' and 'C' indicating the batch and channel dimension respectively. The rest of the dimensions must be 'X'. .e.g. format="BCXX" if image data with BCHW format is used. If a 3D data with the channel at the last dimension, use format="BXXXC" indicating Batch X Height X Width X Depth X Channel. If not provided, the format will be "BCX...X".
