155 lines
4.8 KiB
Python
155 lines
4.8 KiB
Python
import argparse, os, sys, glob
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import torch
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import numpy as np
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from omegaconf import OmegaConf
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from PIL import Image
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from tqdm import tqdm, trange
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from einops import rearrange
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from torchvision.utils import make_grid
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from ldm.util import instantiate_from_config
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from ldm.models.diffusion.ddim import DDIMSampler
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def load_model_from_config(config, ckpt, verbose=False):
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print(f"Loading model from {ckpt}")
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pl_sd = torch.load(ckpt, map_location="cpu")
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sd = pl_sd["state_dict"]
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model = instantiate_from_config(config.model)
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m, u = model.load_state_dict(sd, strict=False)
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if len(m) > 0 and verbose:
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print("missing keys:")
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print(m)
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if len(u) > 0 and verbose:
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print("unexpected keys:")
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print(u)
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model.cuda()
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model.eval()
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return model
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if __name__ == "__main__":
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parser = argparse.ArgumentParser()
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parser.add_argument(
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"--prompt",
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type=str,
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nargs="?",
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default="a painting of a virus monster playing guitar",
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help="the prompt to render"
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)
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parser.add_argument(
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"--outdir",
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type=str,
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nargs="?",
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help="dir to write results to",
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default="outputs/txt2img-samples"
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)
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parser.add_argument(
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"--ddim_steps",
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type=int,
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default=200,
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help="number of ddim sampling steps",
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)
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parser.add_argument(
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"--ddim_eta",
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type=float,
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default=0.0,
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help="ddim eta (eta=0.0 corresponds to deterministic sampling",
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)
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parser.add_argument(
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"--n_iter",
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type=int,
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default=1,
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help="sample this often",
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)
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parser.add_argument(
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"--H",
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type=int,
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default=256,
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help="image height, in pixel space",
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)
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parser.add_argument(
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"--W",
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type=int,
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default=256,
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help="image width, in pixel space",
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)
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parser.add_argument(
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"--n_samples",
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type=int,
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default=4,
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help="how many samples to produce for the given prompt",
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)
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parser.add_argument(
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"--scale",
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type=float,
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default=5.0,
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help="unconditional guidance scale: eps = eps(x, empty) + scale * (eps(x, cond) - eps(x, empty))",
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)
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opt = parser.parse_args()
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config = OmegaConf.load("configs/latent-diffusion/txt2img-1p4B-eval.yaml") # TODO: Optionally download from same location as ckpt and chnage this logic
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model = load_model_from_config(config, "models/ldm/text2img-large/model.ckpt") # TODO: check path
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device = torch.device("cuda") if torch.cuda.is_available() else torch.device("cpu")
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model = model.to(device)
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sampler = DDIMSampler(model)
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os.makedirs(opt.outdir, exist_ok=True)
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outpath = opt.outdir
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prompt = opt.prompt
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sample_path = os.path.join(outpath, "samples")
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os.makedirs(sample_path, exist_ok=True)
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base_count = len(os.listdir(sample_path))
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all_samples=list()
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with torch.no_grad():
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with model.ema_scope():
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uc = None
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if opt.scale > 0:
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uc = model.get_learned_conditioning(opt.n_samples * [""])
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for n in trange(opt.n_iter, desc="Sampling"):
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c = model.get_learned_conditioning(opt.n_samples * [prompt])
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shape = [4, opt.H//8, opt.W//8]
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samples_ddim, _ = sampler.sample(S=opt.ddim_steps,
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conditioning=c,
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batch_size=opt.n_samples,
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shape=shape,
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verbose=False,
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unconditional_guidance_scale=opt.scale,
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unconditional_conditioning=uc,
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eta=opt.ddim_eta)
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x_samples_ddim = model.decode_first_stage(samples_ddim)
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x_samples_ddim = torch.clamp((x_samples_ddim+1.0)/2.0, min=0.0, max=1.0)
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for x_sample in x_samples_ddim:
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x_sample = 255. * rearrange(x_sample.cpu().numpy(), 'c h w -> h w c')
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Image.fromarray(x_sample.astype(np.uint8)).save(os.path.join(sample_path, f"{base_count:04}.png"))
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base_count += 1
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all_samples.append(x_samples_ddim)
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# additionally, save as grid
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grid = torch.stack(all_samples, 0)
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grid = rearrange(grid, 'n b c h w -> (n b) c h w')
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grid = make_grid(grid, nrow=opt.n_samples)
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# to image
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grid = 255. * rearrange(grid, 'c h w -> h w c').cpu().numpy()
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Image.fromarray(grid.astype(np.uint8)).save(os.path.join(outpath, f'{prompt.replace(" ", "-")}.png'))
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print(f"Your samples are ready and waiting four you here: \n{outpath} \nEnjoy.")
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