def item_based_recommend(user_id, user_item_time_dict, i2i_sim, sim_item_topk, recall_item_num, item_topk_click):
"""
:param user_id: 用户id
:param user_item_time_dict: 字典, 根据点击时间获取用户的点击文章序列 {user1: [(item1, time1), (item2, time2)..]...}
:param i2i_sim: 字典，文章相似性矩阵
:param sim_item_topkuser择与当前文章最相似的前k篇文章
:param recall_item_num: 整数， 最后的召回文章数量
:param item_topk_click: 列表，点击次数最多的文章列表，用户召回补全
return: 召回的文章列表 {item1:score1, item2: score2...}
"""
# 获取用户历史交互的文章
user_hist_items = user_item_time_dict[user_id]
user_hist_items_ = {user_id for user_id, _ in user_hist_items}
item_rank = {}
for loc, (i, click_time) in enumerate(user_hist_items):
for j, wij in sorted(i2i_sim[i].items(), key=lambda x: x[1], reverse=True)[:sim_item_topk]:
if j in user_hist_items_:
continue
item_rank.setdefault(j, 0)
item_rank[j] += wij
# 不足10个，用热门商品补全
if len(item_rank) < recall_item_num:
for i, item in enumerate(item_topk_click):
if item in item_rank.items(): # 填充的item应该不在原来的列表中
continue
item_rank[item] = - i - 100 # 随便给个负数就行
if len(item_rank) == recall_item_num:
break
item_rank = sorted(item_rank.items(), key=lambda x: x[1], reverse=True)[:recall_item_num]
return item_rank
哪位能把这段代码改成用scala语言写的