Model parallel ImageNet parameters.

def mtf_image_transformer_base_imagenet_mp64():
  """Model parallel ImageNet parameters."""
  hparams = mtf_image_transformer_base_imagenet()
  hparams.mesh_shape = "model:8;batch:4"
  hparams.layout = "batch:batch;d_ff:model;heads:model"
  hparams.batch_size = 8
  hparams.img_len = 64
  hparams.num_decoder_layers = 8
  return hparams