Implement DDIM with the "trailing" timestep spacing and TCD #568
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…eter for DDIM and TCD, minor comment clarification
yslai
changed the title
stduhpf
reviewed
Jan 14, 2025
examples/cli/main.cpp
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| printf(" -H, --height H image height, in pixel space (default: 512)\n"); | ||
| printf(" -W, --width W image width, in pixel space (default: 512)\n"); | ||
| printf(" --sampling-method {euler, euler_a, heun, dpm2, dpm++2s_a, dpm++2m, dpm++2mv2, ipndm, ipndm_v, lcm}\n"); | ||
| printf(" --sampling-method {euler, euler_a, heun, dpm2, dpm++2s_a, dpm++2m, dpm++2mv2, ipndm, ipndm_v, lcm, ddim_trailing}\n"); |
Contributor
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You forgot to add TCD here. At some point it will be cleaner to iterate over sample_method_str[] for printing the help message.
…ent reference style
Contributor
|
Both DDIM and TCD work very well with PCM LoRAs, too. Tested with SD 1.5 and SDXL. |
Owner
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Thank you for your contribution |
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I noticed that due to the structure of k-diffusion, stable-diffusion.cpp does not support DDIM and TCD, which are particularly useful for acceleration techniques like Hyper-SD. This patch implements DDIM ("trailing" timestep spacing version) and TCD on top of the k-diffusion structure, by recalculating the beta_t schedule and cumulative alpha_t products, and then use them to undo the scaling functions in k-diffusion to match DDIM/TCD. The (stochastic) eta parameter in DDIM and TCD is also implemented, in order for TCD to be useful for Hyper-SD in multi-step settings.