pitstride

confirmedupstream bugPython · timmModel behavior & reasoningJuly 25, 2026

the question

Does timm's PiT feature_info report the correct cumulative downsampling strides under features_only?

what came out

timm's PiT feature_info reports reduction=(stride-1)*2^i instead of the cumulative stride*2^i, so features_only PiT advertises [7,14,28] where the true strides from feature sizes are [8,16,32]. The base is non-power-of-two and names no real downsampling factor; Swin's control base is correct. Fix: reduction=stride*2^i.

method & receipts

Result: confirmed
Reproducible — one script re-runs the whole thing from scratch.
Tested — a correctness/benchmark suite ships alongside the code.

→ read the code and re-run it

github.com/v-code01/pitstride