code: def imagetransformer_sep_channels():
    
    hparams = imagetransformer_base()
    hparams.num_heads = 4
    hparams.attention_key_channels = hparams.attention_value_channels = 0
    hparams.hidden_size = 256
    hparams.filter_size = 512
    hparams.num_hidden_layers = 6
    return hparams
docs: separate rgb embeddings.