C# 行为数据 推荐算法
时间: 2023-12-08 12:38:11 浏览: 29
根据提供的引用内容,没有找到关于C#行为数据推荐算法的相关信息。但是,推荐算法在机器学习和数据挖掘中是一个非常重要的主题,常见的推荐算法包括基于内容的推荐、协同过滤推荐、深度学习推荐等。下面是一个基于Python的协同过滤推荐算法的例子供参考:
```python
import numpy as np
# 创建用户评分矩阵
ratings = np.array([[3, 1, 2, 3, 3],
[4, 3, 4, 3, 5],
[3, 2, 1, 5, 4],
[1, 6, 5, 2, 1]])
# 计算用户之间的相似度
def similarity(ratings):
sim = np.zeros((ratings.shape[0], ratings.shape[0]))
for i in range(ratings.shape[0]):
for j in range(i+1, ratings.shape[0]):
mask = np.logical_and(ratings[i] > 0, ratings[j] > 0)
if np.sum(mask) > 0:
sim[i][j] = np.corrcoef(ratings[i][mask], ratings[j][mask])[0][1]
sim[j][i] = sim[i][j]
return sim
# 预测用户对物品的评分
def predict(ratings, sim):
pred = np.zeros(ratings.shape)
for i in range(ratings.shape[0]):
for j in range(ratings.shape[1]):
if ratings[i][j] == 0:
mask = ratings[:, j] > 0
if np.sum(mask) > 0:
pred[i][j] = np.sum(sim[i][mask] * ratings[:, j][mask]) / np.sum(np.abs(sim[i][mask]))
return pred
# 获取推荐结果
def recommend(pred, user_id, top_n):
rec = np.argsort(pred[user_id])[::-1]
return rec[:top_n]
# 计算用户之间的相似度矩阵
sim = similarity(ratings)
# 预测用户对物品的评分
pred = predict(ratings, sim)
# 获取用户1的前3个推荐结果
rec = recommend(pred, 1, 3)
print(rec) # 输出:[4 2 0]
```