Method __init__

(self,
                 dim,
                 mlp_ratio=4.,
                 drop=0.,
                 drop_path=0.,
                 act_layer=nn.GELU,
                 norm_layer=nn.LayerNorm,
                 focal_level=2,
                 focal_window=9,
                 use_postln=False,
                 use_postln_in_modulation=False,
                 scaling_modulator=False,
                 use_layerscale=False,
                 layerscale_value=1e-4)