code: def astype(
      x: Union[(None, mx.ndarray.NDArray)],
      dtype: Union[(None, str)],
      /,
      *,
      copy: bool = True,
      out: Optional[Union[(None, mx.ndarray.NDArray)]] = None,
  ) -> Union[(None, mx.ndarray.NDArray)]:
      dtype = ivy.as_native_dtype(dtype)
      if x.dtype == dtype:
          return mx.nd.copy(x) if copy else x
      return x.astype(dtype)
  
imports: import mxnet
  from typing import Optional, Union, Sequence, List
  import numpy
  import ivy
  from ivy.functional.ivy.data_type import _handle_nestable_dtype_info
  from ivy.utils.exceptions import IvyNotImplementedException
label_desc: Use image node_id 1 for calling a global function with example usage: astype() and returns: x, unknown