code: def vec(self, sz: int):
      assert (
          sz > 1 and self.sz == 1
      ), f"can't vectorize {self} with size {sz}"
      return DType(
          self.priority,
          self.itemsize * sz,
          f"{INVERSE_DTYPES_DICT[self.name]}{sz}",
          None,
          sz,
      )
  
imports: from typing import Final, Optional, ClassVar, Set, Tuple, Dict
  from dataclasses import dataclass
  import numpy
  import functools
label_desc: Use image node_id 2 for calling the DType obj's underlying member method code with example usage: obj.vec(sz) and returns: DType