process_vec.jl

function generate_batch(batch_size, num_skips, skip_window, data_index)
    @assert batch_size % num_skips == 0
    @assert num_skips <= 2 * skip_window
    batch  = zeros(Int32, (batch_size)) 
    labels = zeros(Int32, (batch_size,1))
    span = 2 * skip_window + 1 
    buffer = Int[] 
    
    for _ in 1:span
        push!(buffer,data[data_index])
        data_index = (data_index + 1) > length(data)? 1:(data_index + 1) # circular pointer
    end
    
    for i in 0:round(Int,batch_size / num_skips)-1
        
        target = skip_window +1 # target label at the center of the buffer
        targets_to_avoid = [ (skip_window +1) ]
        
        for j in 0:num_skips-1            
            
            while target in targets_to_avoid
                target = rand(collect(1:span)) #random.randint(0, span - 1)
            end            
            
            push!(targets_to_avoid, target)
            batch[i * (num_skips) + j + 1] = buffer[skip_window+1]
            labels[i * (num_skips) + j + 1, 1] = buffer[target]
        end
        
        push!(buffer,data[data_index]); 
        while length(buffer) > span shift!(buffer) end
        data_index = (data_index + 1) > length(data)? 1:(data_index + 1)
    end
  return batch, labels, data_index
end