where T is the length of the longest sequence. This function
     assumes trailing dimensions and type of all the Tensors in
     sequences are same.
Parameters:
      * sequences (list[Tensor]) -- list of variable
        length sequences.
  * **batch_first** (*bool**, **optional*) -- output will be in "B
    x T x *" if True, or in "T x B x *" otherwise. Default: False.

  * **padding_value** (*float**, **optional*) -- value for padded
    elements. Default: 0.

Returns:
      Tensor of size "T x B x " if "batch_first" is "False". Tensor
      of size "B x T x " otherwise
Return type:
      Tensor