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[Python3.6] IEEE Paper "Matrix Factorization Techniques for Recommender Systems" by Koren,Bell,Volinsky

License: MIT License

Jupyter Notebook 84.82% TeX 7.33% Python 7.85%
matrix-factorization netflix netflix-movies paper-implementations matrix-decompositions rating-prediction recommender-system recommendation-system netflix-prize netflix-database

paper-implementation-matrix-factorization-recommender-systems-netflix's Introduction

Paper-Implementation-Matrix-Factorization-Recommender-Systems-Netflix

license Python 3.6

IEEE paper "Matrix Factorization Techniques for Recommender Systems"

- Yehuda Koren, Robert Bell, Chris Volinsky

Python 3.6

Links to original paper published by IEEE Computer Society : [1], [2]

Link to Netflix Dataset Used : [1]

Files

  1. Presentation.pdf : Explains the paper. Was written in Latex Beamer, tex code is in presentation.tex

  2. recommender_final.py : The final recommender. Includes biases and regularization. Requires mf.py to be imported to run. Use directly on any dataset by changing line 19 in recommender_final.py.

  3. recommender_final_toy_dataset.py shows how exactly Matrix Factorization Techniques work by considering a 5x5 toy dataset.

  4. The .ipynb_ files include visualizations of RMSE decreasing with iterations when fitting on the training dataset. All .ipynb files are standalone and do not require importing mf.py

  5. feasible_data_n.txt : Files with only the first n datapoints from whole dataset. Used for Testing.

  6. Training and Testing Data :
    Not given separately. Program randomly separates k% of data as Test data, trains on remaining, then tests on the k% values. Default k=20, can be changed on line 154.

Error Analysis

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paper-implementation-matrix-factorization-recommender-systems-netflix's Issues

i can not understand why you do like this ,my god !!

mse = self.mse()

......
def mse(self):
...................
return np.sqrt(error) ???

x = [x for x, y in training_process]
y = [y for x, y in training_process]
x = x[::10]
y = y[::10]
plt.figure(figsize=((16,4)))
plt.plot(x, np.sqrt(y)) ????

print("\nFinding Error on test set...\n")
msef=0.0
for i1 in range(len(i)):
for i2 in range(len(j)):
if R1.item(i[i1],j[i2])!=0:
msef = msef + (R1.item((i[i1],j[i2]))-(L).item((i[i1],j[i2])))2
msef = (msef/(len(j)*len(i))) ????
print("RMSE f=",msef
0.5)

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