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smousavi05 / EQTransformer

EQTransformer, a python package for earthquake signal detection and phase picking using AI.
https://rebrand.ly/EQT-documentations
MIT License
301 stars 148 forks source link

Picks biased onto samples divisible by 100? #166

Open JoshRichW opened 4 months ago

JoshRichW commented 4 months ago

Hi there,

I've noticed something weird with the performance of the EQT model - specifically the original model file. I tried loading the model and then running it on the 100samples.hdf5 data to seem how it performs. For this, I noticed the P picks were preferentially happening on 100 sample (1 second) boundaries. For example, here is the list of the locations of the max probability for each of those 100 samples: image

Note that many of them are exactly on 100 sample boundaries - this is without any additional logic, just by selecting the index of max probability on the predictions that come out of the model.

I tested to see whether this was a tensorflow versioning issue - I've tried both tensorflow 2.6 and 2.11 and confirmed that both setups have the same issue. I also tested with some other 100 Hz data and noticed the same behavior.

Any ideas? It doesn't seem to happen quite as much when using the conservative model: image Although it does still happen to some degree.

I did not apply any preprocessing to the data in the hdf file.

Any information you can give me would be much appreciated.

Thanks, Josh W