Implementation of SSMF: Shifting Seasonal Matrix Factorization

Overview

SSMF

Implementation of SSMF: Shifting Seasonal Matrix Factorization, Koki Kawabata, Siddharth Bhatia, Rui Liu, Mohit Wadhwa, Bryan Hooi. NeurIPS, 2021.

ssmf

DEMO

  • Please RUN python3 ssmf.py, which starts processing DISEASE dataset and produces the SSMF results into "out" directory.
  • Also, please RUN python3 ssmf.py --max_regimes 1 to compare its performance with SMF, which does not assume regime shifts.

Input for SSMF

SSMF expects 3-dimensional numpy.ndarray, whose last dimension corresponds to time points. If you have multi-column dataframes, utils.list2tensor helps convert your data to 3-dimensional array.

Commnad line options

  • --output_dir:
    Path of output directory (default: 'out')
  • --periodicity:
    Length of periodicity (default: 52, for yearly patterns of weekly data)
  • --n_components:
    Rank of matrix factorization (default: 10)
  • --max_regimes:
    Maximum number of regimes (default: 50, set at 1 for SMF)
  • --learning_rate:
    Size of gradient steps in each update (default: 0.2)
  • --max_iter:
    Number of iterations to estimate new regimes (default: 1)
  • --float_cost:
    Number of bits in MDL (default: 32)
  • --update_freq:
    Interval of regime estimation (default: 1)

Installation

You will need to install following libraries,

Datasets

Citation

If you use this code for your research, please consider citing our paper.

@inproceedings{kawabata2021ssmf,
    title={SSMF: Shifting Seasonal Matrix Factorization},
    author={Koki Kawabata, Siddharth Bhatia, Rui Liu, Mohit Wadhwa, Bryan Hooi},
    booktitle={NeurIPS},
    year={2021}
Owner
Koki Kawabata
I am an Assistant Professor at SANKEN, Osaka University. My research interests include data stream mining and dynamic modeling of sequence patterns.
Koki Kawabata
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