Writes VASP input to an output_dir.

        Args:
            vasp_input_set:
                pymatgen.io.vaspio_set.VaspInputSet like object that creates
                vasp input files from structures
            output_dir: Directory to output files
            create_directory: Create the directory if not present. Defaults to
                True.
            \\*\\*kwargs: All keyword args supported by the VASP input set.

def write_vasp_input(self, vasp_input_set=MPRelaxSet, output_dir=".",
                         create_directory=True, **kwargs):
        """
        Writes VASP input to an output_dir.

        Args:
            vasp_input_set:
                pymatgen.io.vaspio_set.VaspInputSet like object that creates
                vasp input files from structures
            output_dir: Directory to output files
            create_directory: Create the directory if not present. Defaults to
                True.
            \\*\\*kwargs: All keyword args supported by the VASP input set.
        """
        vasp_input_set(self.final_structure, **kwargs).write_input(
            output_dir, make_dir_if_not_present=create_directory)
        with open(os.path.join(output_dir, "transformations.json"), "w") as fp:
            json.dump(self.as_dict(), fp)