periodicity calculation

[manglu097]

Why is the period corresponding to 15 minutes 96?

[HALF111]

Hello, thank you for your attention to our work! I apologize for the lack of clarity in my demo description, which may have caused you confusion.
In our work, the periodicity of each time series sample is determined through Fourier transform or by analyzing the sampling frequency. (You can refer to the implementation details inside the freq_to_seasonality_list function for more information.)
In the demo, since ETTm1 is a very commonly used dataset in time series forecasting, we can actually pre-determine its daily periodicity via Fourier transform. Furthermore, given its sampling frequency of 15 minutes, the freq_to_seasonality_list function correctly returns a periodicity length of 24 * 4 = 96. I hope this clarifies your question.