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| import torch | |
| from lib.utils.iimage import IImage | |
| from pytorch_lightning import seed_everything | |
| from tqdm import tqdm | |
| from lib.smplfusion import share, router, attentionpatch, transformerpatch | |
| from lib.smplfusion.patches.attentionpatch import painta | |
| from lib.utils import tokenize, scores | |
| verbose = False | |
| def init_painta(token_idx): | |
| # Initialize painta | |
| router.attention_forward = attentionpatch.painta.forward | |
| router.basic_transformer_forward = transformerpatch.painta.forward | |
| painta.painta_on = True | |
| painta.painta_res = [16, 32] | |
| painta.token_idx = token_idx | |
| def init_guidance(): | |
| # Setup model for guidance only! | |
| router.attention_forward = attentionpatch.default.forward_and_save | |
| router.basic_transformer_forward = transformerpatch.default.forward | |
| def run(ddim, method, prompt, image, mask, seed, eta, prefix, negative_prompt, positive_prompt, dt, guidance_scale): | |
| # Text condition | |
| prompt = prefix.format(prompt) | |
| context = ddim.encoder.encode([negative_prompt, prompt + positive_prompt]) | |
| token_idx = list(range(1 + prefix.split(' ').index('{}'), tokenize(prompt).index('<end_of_text>'))) | |
| token_idx += [tokenize(prompt + positive_prompt).index('<end_of_text>')] | |
| # Initialize painta | |
| if 'painta' in method: init_painta(token_idx) | |
| else: init_guidance() | |
| # Image condition | |
| unet_condition = ddim.get_inpainting_condition(image, mask) | |
| share.set_mask(mask) | |
| # Starting latent | |
| seed_everything(seed) | |
| zt = torch.randn((1,4) + unet_condition.shape[2:]).cuda() | |
| # Setup unet for guidance | |
| ddim.unet.requires_grad_(True) | |
| pbar = tqdm(range(999, 0, -dt)) if verbose else range(999, 0, -dt) | |
| for timestep in share.DDIMIterator(pbar): | |
| if 'painta' in method and share.timestep <= 500: init_guidance() | |
| zt = zt.detach() | |
| zt.requires_grad = True | |
| # Reset storage | |
| share._crossattn_similarity_res16 = [] | |
| # Run the model | |
| _zt = zt if unet_condition is None else torch.cat([zt, unet_condition], 1) | |
| eps_uncond, eps = ddim.unet( | |
| torch.cat([_zt, _zt]), | |
| timesteps = torch.tensor([timestep, timestep]).cuda(), | |
| context = context | |
| ).detach().chunk(2) | |
| # Unconditional guidance | |
| eps = (eps_uncond + guidance_scale * (eps - eps_uncond)) | |
| z0 = (zt - share.schedule.sqrt_one_minus_alphas[timestep] * eps) / share.schedule.sqrt_alphas[timestep] | |
| # Gradient Computation | |
| score = scores.bce(share._crossattn_similarity_res16, share.mask16, token_idx = token_idx) | |
| score.backward() | |
| grad = zt.grad.detach() | |
| ddim.unet.zero_grad() # Cleanup already | |
| # DDIM Step | |
| with torch.no_grad(): | |
| sigma = share.schedule.sigma(share.timestep, dt) | |
| # Standartization | |
| grad -= grad.mean() | |
| grad /= grad.std() | |
| zt = share.schedule.sqrt_alphas[share.timestep - dt] * z0 + torch.sqrt(1 - share.schedule.alphas[share.timestep - dt] - sigma ** 2) * eps + eta * sigma * grad | |
| with torch.no_grad(): | |
| output_image = IImage(ddim.vae.decode(z0 / ddim.config.scale_factor)) | |
| return output_image |