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Calculate the similarity of two vectors

2017-02-012019-10-22VintaMachine Learning, Python

You should only calculate Pearson Correlations when the number of items in common between two users is > 1, preferably greater than 5/10. Only calculate the Pearson Correlation for two users where they have commonly rated items.

Recommender System: Collaborative Filtering 協同過濾推薦演算法

2017-01-312019-10-22VintaMachine Learning

dataset 會是 m 個用戶對 n 個物品的評分 utility matrix，因為通常只有部分用戶和部份物品會有評分資料，所以是一個 sparse matrix（稀疏矩陣）。目標是利用這些稀疏的資料去預測出用戶對他還沒評分過的物品的評分。

Parallel tasks in Python: concurrent.futures

2017-01-252019-10-22VintaPython

concurrent.futures is well suited to Embarrassingly Parallel tasks. You could write concurrent code with a simple for loop.

Machine Learning glossary 常見名詞解釋

2017-01-232019-10-22VintaMachine Learning

機器學習常見名詞解釋

Convert utf8 tables to utf8mb4 in MySQL

2017-01-232019-10-22VintaDatabase

Don’t blindly copy-paste this!