mixerblock(planes, npatches; mlp_ratio = (0.5, 4.0), mlp_layer = mlp_block, 
           dropout = 0., drop_path_rate = 0., activation = gelu)

Creates a feedforward block for the MLPMixer architecture. (reference)

Arguments:

• planes: the number of planes in the block
• npatches: the number of patches of the input
• mlp_ratio: number(s) that determine(s) the number of hidden channels in the token mixing MLP and/or the channel mixing MLP as a ratio to the number of planes in the block.
• mlp_layer: the MLP layer to use in the block
• dropout: the dropout rate to use in the MLP blocks
• drop_path_rate: Stochastic depth rate
• activation: the activation function to use in the MLP blocks