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def generate_batch(batch_size, data_vec, word_to_int):
    n_chunk = len(data_vec) // batch_size
    x_batches = []
    y_batches = []
    for i in range(n_chunk):
        start_index = i * batch_size
        end_index = start_index + batch_size


        batches = data_vec[start_index:end_index]
        length = max(map(len, batches))
        x_data = np.full((batch_size, length), word_to_int[UNK_TOKEN], np.int32)
        for row in range(batch_size):
            x_data[row, :len(batches[row])] = batches[row]
        y_data = np.copy(x_data)
        y_data[:, :-1] = x_data[:, 1:]
        """
        x_data             y_data
        [6,2,4,6,9]       [2,4,6,9,9]
        [1,4,2,8,5]       [4,2,8,5,5]
        """
        x_batches.append(x_data)
        y_batches.append(y_data)
    return x_batches, y_batches