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inference.py
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inference.py
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from typing import List, Tuple
import os
import math
from argparse import ArgumentParser, Namespace
import numpy as np
import torch
import einops
import pytorch_lightning as pl
from PIL import Image
from omegaconf import OmegaConf
from model.spaced_sampler import SpacedSampler
from model.ddim_sampler import DDIMSampler
from model.cldm import ControlLDM
from utils.image import (
wavelet_reconstruction, adaptive_instance_normalization, auto_resize, pad
)
from utils.common import instantiate_from_config, load_state_dict
from utils.file import list_image_files, get_file_name_parts
@torch.no_grad()
def process(
model: ControlLDM,
control_imgs: List[np.ndarray],
sampler: str,
steps: int,
strength: float,
color_fix_type: str,
disable_preprocess_model: bool
) -> Tuple[List[np.ndarray], List[np.ndarray]]:
"""
Apply DiffBIR model on a list of low-quality images.
Args:
model (ControlLDM): Model.
control_imgs (List[np.ndarray]): A list of low-quality images (HWC, RGB, range in [0, 255])
sampler (str): Sampler name.
steps (int): Sampling steps.
strength (float): Control strength. Set to 1.0 during traning.
color_fix_type (str): Type of color correction for samples.
disable_preprocess_model (bool): If specified, preprocess model (SwinIR) will not be used.
Returns:
preds (List[np.ndarray]): Restoration results (HWC, RGB, range in [0, 255]).
stage1_preds (List[np.ndarray]): Outputs of preprocess model (HWC, RGB, range in [0, 255]).
If `disable_preprocess_model` is specified, then preprocess model's outputs is the same
as low-quality inputs.
"""
n_samples = len(control_imgs)
if sampler == "ddpm":
sampler = SpacedSampler(model, var_type="fixed_small")
else:
sampler = DDIMSampler(model)
control = torch.tensor(np.stack(control_imgs) / 255.0, dtype=torch.float32, device=model.device).clamp_(0, 1)
control = einops.rearrange(control, "n h w c -> n c h w").contiguous()
# TODO: model.preprocess_model = lambda x: x
if not disable_preprocess_model and hasattr(model, "preprocess_model"):
control = model.preprocess_model(control)
elif disable_preprocess_model and not hasattr(model, "preprocess_model"):
raise ValueError(f"model doesn't have a preprocess model.")
height, width = control.size(-2), control.size(-1)
cond = {
"c_latent": [model.apply_condition_encoder(control)],
"c_crossattn": [model.get_learned_conditioning([""] * n_samples)]
}
model.control_scales = [strength] * 13
shape = (n_samples, 4, height // 8, width // 8)
x_T = torch.randn(shape, device=model.device, dtype=torch.float32)
if isinstance(sampler, SpacedSampler):
samples = sampler.sample(
steps, shape, cond,
unconditional_guidance_scale=1.0,
unconditional_conditioning=None,
cond_fn=None, x_T=x_T
)
else:
sampler: DDIMSampler
samples, _ = sampler.sample(
S=steps, batch_size=shape[0], shape=shape[1:],
conditioning=cond, unconditional_conditioning=None,
x_T=x_T, eta=0
)
x_samples = model.decode_first_stage(samples)
x_samples = ((x_samples + 1) / 2).clamp(0, 1)
# apply color correction (borrowed from StableSR)
if color_fix_type == "adain":
x_samples = adaptive_instance_normalization(x_samples, control)
elif color_fix_type == "wavelet":
x_samples = wavelet_reconstruction(x_samples, control)
else:
assert color_fix_type == "none", f"unexpected color fix type: {color_fix_type}"
x_samples = (einops.rearrange(x_samples, "b c h w -> b h w c") * 255).cpu().numpy().clip(0, 255).astype(np.uint8)
control = (einops.rearrange(control, "b c h w -> b h w c") * 255).cpu().numpy().clip(0, 255).astype(np.uint8)
preds = [x_samples[i] for i in range(n_samples)]
stage1_preds = [control[i] for i in range(n_samples)]
return preds, stage1_preds
def parse_args() -> Namespace:
parser = ArgumentParser()
parser.add_argument("--ckpt", required=True, type=str)
parser.add_argument("--config", required=True, type=str)
parser.add_argument("--reload_swinir", action="store_true")
parser.add_argument("--swinir_ckpt", type=str, default="")
parser.add_argument("--input", type=str, required=True)
parser.add_argument("--sampler", type=str, default="ddpm", choices=["ddpm", "ddim"])
parser.add_argument("--steps", required=True, type=int)
parser.add_argument("--sr_scale", type=float, default=1)
parser.add_argument("--image_size", type=int, default=512)
parser.add_argument("--repeat_times", type=int, default=1)
parser.add_argument("--disable_preprocess_model", action="store_true")
parser.add_argument("--color_fix_type", type=str, default="wavelet", choices=["wavelet", "adain", "none"])
parser.add_argument("--resize_back", action="store_true")
parser.add_argument("--output", type=str, required=True)
parser.add_argument("--show_lq", action="store_true")
parser.add_argument("--skip_if_exist", action="store_true")
parser.add_argument("--seed", type=int, default=231)
return parser.parse_args()
def main() -> None:
args = parse_args()
pl.seed_everything(args.seed)
device = "cuda" if torch.cuda.is_available() else "cpu"
model: ControlLDM = instantiate_from_config(OmegaConf.load(args.config))
load_state_dict(model, torch.load(args.ckpt, map_location="cpu"), strict=True)
# reload preprocess model if specified
if args.reload_swinir:
if not hasattr(model, "preprocess_model"):
raise ValueError(f"model don't have a preprocess model.")
print(f"reload swinir model from {args.swinir_ckpt}")
load_state_dict(model.preprocess_model, torch.load(args.swinir_ckpt, map_location="cpu"), strict=True)
model.freeze()
model.to(device)
assert os.path.isdir(args.input)
print(f"sampling {args.steps} steps using ddpm sampler")
for file_path in list_image_files(args.input, follow_links=True):
lq = Image.open(file_path).convert("RGB")
if args.sr_scale != 1:
lq = lq.resize(
tuple(math.ceil(x * args.sr_scale) for x in lq.size),
Image.BICUBIC
)
lq_resized = auto_resize(lq, args.image_size)
x = pad(np.array(lq_resized), scale=64)
for i in range(args.repeat_times):
save_path = os.path.join(args.output, os.path.relpath(file_path, args.input))
parent_path, stem, _ = get_file_name_parts(save_path)
save_path = os.path.join(parent_path, f"{stem}_{i}.png")
if os.path.exists(save_path):
if args.skip_if_exist:
print(f"skip {save_path}")
continue
else:
raise RuntimeError(f"{save_path} already exist")
os.makedirs(parent_path, exist_ok=True)
try:
preds, stage1_preds = process(
model, [x], steps=args.steps, sampler=args.sampler,
strength=1,
color_fix_type=args.color_fix_type,
disable_preprocess_model=args.disable_preprocess_model
)
except RuntimeError as e:
# Avoid cuda_out_of_memory error.
print(f"{file_path}, error: {e}")
continue
pred, stage1_pred = preds[0], stage1_preds[0]
# remove padding
pred = pred[:lq_resized.height, :lq_resized.width, :]
stage1_pred = stage1_pred[:lq_resized.height, :lq_resized.width, :]
if args.show_lq:
if args.resize_back:
if lq_resized.size != lq.size:
pred = np.array(Image.fromarray(pred).resize(lq.size, Image.LANCZOS))
stage1_pred = np.array(Image.fromarray(stage1_pred).resize(lq.size, Image.LANCZOS))
lq = np.array(lq)
else:
lq = np.array(lq_resized)
images = [lq, pred] if args.disable_preprocess_model else [lq, stage1_pred, pred]
Image.fromarray(np.concatenate(images, axis=1)).save(save_path)
else:
if args.resize_back and lq_resized.size != lq.size:
Image.fromarray(pred).resize(lq.size, Image.LANCZOS).save(save_path)
else:
Image.fromarray(pred).save(save_path)
print(f"save to {save_path}")
if __name__ == "__main__":
main()