sample.py

# This code is built from the Stable Diffusion repository: https://github.com/CompVis/stable-diffusion.
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# Attachment A

# Use Restrictions

# You agree not to use the Model or Derivatives of the Model:
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import argparse, os, sys, glob
sys.path.append('stable-diffusion')
import torch
import numpy as np
from omegaconf import OmegaConf
from PIL import Image
from tqdm import tqdm, trange
from einops import rearrange
from torchvision.utils import make_grid
from pytorch_lightning import seed_everything
from torch import autocast
from contextlib import contextmanager, nullcontext

from ldm.util import instantiate_from_config
from ldm.models.diffusion.ddim import DDIMSampler
from ldm.models.diffusion.plms import PLMSSampler
import wandb

def load_model_from_config(config, ckpt, verbose=False):
    print(f"Loading model from {ckpt}")
    pl_sd = torch.load(ckpt, map_location="cpu")
    if "global_step" in pl_sd:
        print(f"Global Step: {pl_sd['global_step']}")
    sd = pl_sd["state_dict"]
    model = instantiate_from_config(config.model)

    token_weights = sd["cond_stage_model.transformer.text_model.embeddings.token_embedding.weight"]
    del sd["cond_stage_model.transformer.text_model.embeddings.token_embedding.weight"]
    m, u = model.load_state_dict(sd, strict=False)
    model.cond_stage_model.transformer.text_model.embeddings.token_embedding.weight.data[:token_weights.shape[0]] = token_weights
    if len(m) > 0 and verbose:
        print("missing keys:")
        print(m)
    if len(u) > 0 and verbose:
        print("unexpected keys:")
        print(u)

    model.cuda()
    model.eval()
    return model


def main():
    parser = argparse.ArgumentParser()

    parser.add_argument(
        "--prompt",
        type=str,
        nargs="?",
        default="a painting of a virus monster playing guitar",
        help="the prompt to render"
    )
    parser.add_argument(
        "--outdir",
        type=str,
        nargs="?",
        help="dir to write results to",
        default="outputs/txt2img-samples"
    )
    parser.add_argument(
        "--skip_grid",
        action='store_true',
        help="do not save a grid, only individual samples. Helpful when evaluating lots of samples",
    )
    parser.add_argument(
        "--skip_save",
        action='store_true',
        help="do not save individual samples. For speed measurements.",
    )
    parser.add_argument(
        "--ddim_steps",
        type=int,
        default=200,
        help="number of ddim sampling steps",
    )
    parser.add_argument(
        "--plms",
        action='store_true',
        help="use plms sampling",
    )
    parser.add_argument(
        "--laion400m",
        action='store_true',
        help="uses the LAION400M model",
    )
    parser.add_argument(
        "--fixed_code",
        action='store_true',
        help="if enabled, uses the same starting code across samples ",
    )
    parser.add_argument(
        "--ddim_eta",
        type=float,
        default=1.0,
        help="ddim eta (eta=0.0 corresponds to deterministic sampling",
    )
    parser.add_argument(
        "--n_iter",
        type=int,
        default=1,
        help="sample this often",
    )
    parser.add_argument(
        "--H",
        type=int,
        default=512,
        help="image height, in pixel space",
    )
    parser.add_argument(
        "--W",
        type=int,
        default=512,
        help="image width, in pixel space",
    )
    parser.add_argument(
        "--C",
        type=int,
        default=4,
        help="latent channels",
    )
    parser.add_argument(
        "--f",
        type=int,
        default=8,
        help="downsampling factor",
    )
    parser.add_argument(
        "--n_samples",
        type=int,
        default=6,
        help="how many samples to produce for each given prompt. A.k.a. batch size",
    )
    parser.add_argument(
        "--n_rows",
        type=int,
        default=6,
        help="rows in the grid (default: n_samples)",
    )
    parser.add_argument(
        "--scale",
        type=float,
        default=6.,
        help="unconditional guidance scale: eps = eps(x, empty) + scale * (eps(x, cond) - eps(x, empty))",
    )
    parser.add_argument(
        "--from-file",
        type=str,
        help="if specified, load prompts from this file",
    )
    parser.add_argument(
        "--config",
        type=str,
        default="configs/custom-diffusion/finetune.yaml",
        help="path to config which constructs model",
    )
    parser.add_argument(
        "--ckpt",
        type=str,
        required=True,
        help="path to checkpoint of the pre-trained model",
    )
    parser.add_argument(
        "--delta_ckpt",
        type=str,
        default=None,
        help="path to delta checkpoint of fine-tuned custom diffusion block",
    )
    parser.add_argument(
        "--seed",
        type=int,
        default=42,
        help="the seed (for reproducible sampling)",
    )
    parser.add_argument(
        "--precision",
        type=str,
        help="evaluate at this precision",
        choices=["full", "autocast"],
        default="autocast"
    )
    parser.add_argument(
        "--wandb_log",
        action='store_true',
        help="save grid images to wandb.",
    )
    parser.add_argument(
        "--compress",
        action='store_true',
        help="delta path provided is a compressed checkpoint.",
    )
    parser.add_argument(
        "--modifier_token",
        type=str,
        default=None,
        help="A token to use as a modifier for the concept.",
    )
    opt = parser.parse_args()

    if opt.wandb_log:
        if opt.delta_ckpt is not None:
            name = opt.delta_ckpt.split('/')[-3]
        elif 'checkpoints' in opt.ckpt:
            name = opt.ckpt.split('/')[-3]
        else:
            name = opt.ckpt.split('/')[-1]
        wandb.init(project="custom-diffusion", entity="cmu-gil", name=name )

    if opt.delta_ckpt is not None:
        if len(glob.glob(os.path.join(opt.delta_ckpt.split('checkpoints')[0], "configs/*.yaml"))) > 0:
            opt.config = sorted(glob.glob(os.path.join(opt.delta_ckpt.split('checkpoints')[0], "configs/*.yaml")))[-1]
    else:
        if len(glob.glob(os.path.join(opt.ckpt.split('checkpoints')[0], "configs/*.yaml"))) > 0:
            opt.config = sorted(glob.glob(os.path.join(opt.ckpt.split('checkpoints')[0], "configs/*.yaml")))[-1]

    seed_everything(opt.seed)
    config = OmegaConf.load(f"{opt.config}")
    if opt.modifier_token is not None:
        config.model.params.cond_stage_config.target = 'src.custom_modules.FrozenCLIPEmbedderWrapper'
        config.model.params.cond_stage_config.params = {}
        config.model.params.cond_stage_config.params.modifier_token = opt.modifier_token
    model = load_model_from_config(config, f"{opt.ckpt}")

    if opt.delta_ckpt is not None:
        delta_st = torch.load(opt.delta_ckpt)
        embed = None
        if 'embed' in delta_st['state_dict']:
            embed = delta_st['state_dict']['embed'].reshape(-1,768)
            del delta_st['state_dict']['embed']
            print(embed.shape)
        delta_st = delta_st['state_dict']
        if opt.compress:
            for name in delta_st.keys():
                if 'to_k' in name or 'to_v' in name:
                    delta_st[name] = model.state_dict()[name] + delta_st[name]['u']@delta_st[name]['v']
            model.load_state_dict(delta_st, strict=False)
        else:
            model.load_state_dict(delta_st, strict=False)
        if embed is not None:
            print("loading new embedding")
            print(model.cond_stage_model.transformer.text_model.embeddings.token_embedding.weight.data.shape)
            model.cond_stage_model.transformer.text_model.embeddings.token_embedding.weight.data[-embed.shape[0]:] = embed

    device = torch.device("cuda") if torch.cuda.is_available() else torch.device("cpu")
    model = model.to(device)

    if opt.plms:
        sampler = PLMSSampler(model)
    else:
        sampler = DDIMSampler(model)

    if opt.delta_ckpt is not None:
        outpath = os.path.dirname(os.path.dirname(opt.delta_ckpt))
    else:
        os.makedirs(opt.outdir, exist_ok=True)
        outpath = opt.outdir

    batch_size = opt.n_samples
    n_rows = opt.n_rows if opt.n_rows > 0 else batch_size
    if not opt.from_file:
        prompt = opt.prompt
        assert prompt is not None
        data = [batch_size * [prompt]]
    else:
        print(f"reading prompts from {opt.from_file}")
        with open(opt.from_file, "r") as f:
            data = f.read().splitlines()
            data = [batch_size * [prompt] for prompt in data]

    sample_path = os.path.join(outpath, "samples")

    os.makedirs(sample_path, exist_ok=True)
    base_count = len(os.listdir(sample_path))
    grid_count = len(os.listdir(outpath)) - 1

    start_code = None
    if opt.fixed_code:
        start_code = torch.randn([opt.n_samples, opt.C, opt.H // opt.f, opt.W // opt.f], device=device)

    precision_scope = autocast if opt.precision == "autocast" else nullcontext
    with torch.no_grad():
        with precision_scope("cuda"):
            with model.ema_scope():
                for prompts in tqdm(data, desc="data"):
                    all_samples = list()
                    for n in trange(opt.n_iter, desc="Sampling"):
                        print(prompts[0])
                        uc = None
                        if opt.scale != 1.0:
                            uc = model.get_learned_conditioning(batch_size * [""])
                        if isinstance(prompts, tuple):
                            prompts = list(prompts)
                        c = model.get_learned_conditioning(prompts)
                        shape = [opt.C, opt.H // opt.f, opt.W // opt.f]
                        samples_ddim, _ = sampler.sample(S=opt.ddim_steps,
                                                         conditioning=c,
                                                         batch_size=opt.n_samples,
                                                         shape=shape,
                                                         verbose=False,
                                                         unconditional_guidance_scale=opt.scale,
                                                         unconditional_conditioning=uc,
                                                         eta=opt.ddim_eta,
                                                         x_T=start_code)
                        # print(samples_ddim.size())
                        x_samples_ddim = model.decode_first_stage(samples_ddim)
                        x_samples_ddim = torch.clamp((x_samples_ddim + 1.0) / 2.0, min=0.0, max=1.0)
                        x_samples_ddim = x_samples_ddim.cpu()

                        if not opt.skip_save:
                            for x_sample in x_samples_ddim:
                                x_sample = 255. * rearrange(x_sample.cpu().numpy(), 'c h w -> h w c')
                                img = Image.fromarray(x_sample.astype(np.uint8))
                                img.save(os.path.join(sample_path, f"{base_count:05}.png"))
                                base_count += 1

                        if not opt.skip_grid:
                            all_samples.append(x_samples_ddim)

                    if not opt.skip_grid:
                        # additionally, save as grid
                        grid = torch.stack(all_samples, 0)
                        grid = rearrange(grid, 'n b c h w -> (n b) c h w')
                        grid = make_grid(grid, nrow=n_rows)

                        # to image
                        grid = 255. * rearrange(grid, 'c h w -> h w c').cpu().numpy()
                        img = Image.fromarray(grid.astype(np.uint8))
                        sampling_method = 'plms' if opt.plms else 'ddim'
                        img.save(os.path.join(outpath, f'{prompts[0].replace(" ", "-")}_{opt.scale}_{sampling_method}_{opt.ddim_steps}_{opt.ddim_eta}.png'))
                        if opt.wandb_log:
                            wandb.log({  f'{prompts[0].replace(" ", "-")}_{opt.scale}_{sampling_method}_{opt.ddim_steps}_{opt.ddim_eta}.png'  : [wandb.Image(img)]})
                        grid_count += 1


    print(f"Your samples are ready and waiting for you here: \n{outpath} \n"
          f" \nEnjoy.")


if __name__ == "__main__":
    main()