code: def _split_head(self, F, x: Tensor) -> Tensor:
      x = F.reshape(data=x, shape=(0, 0, -4, self.n_head, self.d_head))
      x = F.swapaxes(data=x, dim1=1, dim2=2)
      return x
  
imports: import math
  from typing import List, Optional, Tuple
  from mxnet import init
  from mxnet.gluon import HybridBlock, nn, rnn
  from gluonts.core.component import validated
  from gluonts.mx import Tensor
label_desc: Use image node_id 2 for calling the SelfAttention obj's underlying member method code with example usage: obj._split_head(F, x) and returns: x