Parameters:
      * sequences (list[Tensor]) -- A list of sequences of
        decreasing length.
  * **enforce_sorted** (*bool**, **optional*) -- if "True", checks
    that the input contains sequences sorted by length in a
    decreasing order. If "False", this condition is not checked.
    Default: "True".

Returns:
      a "PackedSequence" object
Return type:
      PackedSequence