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YuanGongND / ssast

Code for the AAAI 2022 paper "SSAST: Self-Supervised Audio Spectrogram Transformer".
BSD 3-Clause "New" or "Revised" License
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audio file length #33

Open fabianbosshard opened 2 months ago

fabianbosshard commented 2 months ago

Hi Yuan

We have another question: What was the length of the audio files you used? In the paper it is written thatthey are 10 seconds but with 10 seconds the resulting spectrograms (from torchaudio.compliance.kaldi.fbank) are 998 frames (with the frame_shift set to 10ms and the frame_length set to 25ms) and thus the remaining 26 frames are being zero padded by the dataloader (if the target_length is set to 1024).

image

Best Regards, Fabian

YuanGongND commented 2 months ago

They are 10 seconds (Audioset), a small padding is expected. 1024 is just an integral powers of 2, which can be easier to be split into 16*16 patches (suppose no overlap). A small padding won't impact the performance.

-Yuan

fabianbosshard commented 2 months ago

Okay, thanks for your quick reply.

Since we use the frame-based model (we want to finetune it for Speaker Verification), I think we set the target_length to 998. But maybe we use 390 masked patches instead of 400 (to leave the ratio of masked/total numer of frames close to the original setup from your paper).

Best Regards, Fabian

YuanGongND commented 2 months ago

yes, that sounds reasonable. But again, I would expect this will only lead to minor difference.

There might be some hard coded 1024 you need to change in this codebase.