A basic critic for images `n_channels` x `in_size` x `in_size`.
     
    
    basic_critic(in_size, n_channels, ...)
 
    
    Arguments
    - in_size
- input size 
- n_channels
- The number of channels 
- ...
- additional parameters to pass 
 
    
    
    Examples
    if (FALSE) {
critic    = basic_critic(in_size = 64, n_channels = 3, n_extra_layers = 1,
                        act_cls = partial(nn()$LeakyReLU, negative_slope = 0.2))
}