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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def img2img_transformer_b3():
 """Current best hparams for local 1d."""

  hparams = img2img_transformer_base()
  hparams.batch_size = 2
  hparams.layer_preprocess_sequence = "none"
  hparams.layer_postprocess_sequence = "dan"
  hparams.block_length = 128
  hparams.sampling_temp = 0.9
  return hparams