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img2img is now working; small refactoring of grid code in simplet2i.py

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This commit is contained in:
Lincoln Stein 2022-08-18 10:47:53 -04:00
parent c477525036
commit bf76c4f283
2 changed files with 170 additions and 29 deletions
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190
ldm/simplet2i.py
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@ -26,23 +26,22 @@ t2i.load_model()
# override the default values assigned during class initialization
# Will call load_model() if the model was not previously loaded.
# The method returns a list of images. Each row of the list is a sub-list of [filename,seed]
results = t2i.txt2img(prompt = <string> // required
outdir = <path> // the remaining option arguments override constructur value when present
iterations = <integer>
batch = <integer>
steps = <integer>
seed = <integer>
sampler = ['ddim','plms']
grid = <boolean>
width = <integer>
height = <integer>
cfg_scale = <float>
) -> boolean
results = t2i.txt2img(prompt = "an astronaut riding a horse"
outdir = "./outputs/txt2img-samples)
)
for row in results:
print(f'filename={row[0]}')
print(f'seed ={row[1]}')
# Same thing, but using an initial image.
results = t2i.img2img(prompt = "an astronaut riding a horse"
outdir = "./outputs/img2img-samples"
init_img = "./sketches/horse+rider.png")
for row in results:
print(f'filename={row[0]}')
print(f'seed ={row[1]}')
"""
import torch
@ -54,7 +53,7 @@ from omegaconf import OmegaConf
from PIL import Image
from tqdm import tqdm, trange
from itertools import islice
from einops import rearrange
from einops import rearrange, repeat
from torchvision.utils import make_grid
from pytorch_lightning import seed_everything
from torch import autocast
@ -87,6 +86,7 @@ class T2I:
latent_channels
downsampling_factor
precision
strength
"""
def __init__(self,
outdir="outputs/txt2img-samples",
@ -106,7 +106,8 @@ class T2I:
downsampling_factor=8,
ddim_eta=0.0, # deterministic
fixed_code=False,
precision='autocast'
precision='autocast',
strength=0.75 # default in scripts/img2img.py
):
self.outdir = outdir
self.batch = batch
@ -124,15 +125,17 @@ class T2I:
self.downsampling_factor = downsampling_factor
self.ddim_eta = ddim_eta
self.precision = precision
self.strength = strength
self.model = None # empty for now
self.sampler = None
if seed is None:
self.seed = self._new_seed()
else:
self.seed = seed
def txt2img(self,prompt,outdir=None,batch=None,iterations=None,
steps=None,seed=None,grid=None,individual=None,width=None,height=None,
cfg_scale=None,ddim_eta=None):
cfg_scale=None,ddim_eta=None,strength=None,init_img=None):
"""
Generate an image from the prompt, writing iteration images into the outdir
The output is a list of lists in the format: [[filename1,seed1], [filename2,seed2],...]
@ -146,6 +149,7 @@ class T2I:
ddim_eta = ddim_eta or self.ddim_eta
batch = batch or self.batch
iterations = iterations or self.iterations
strength = strength or self.strength # not actually used here, but preserved for code refactoring
model = self.load_model() # will instantiate the model or return it from cache
@ -218,24 +222,146 @@ class T2I:
seed = self._new_seed()
if grid:
n_rows = batch if batch>1 else int(math.sqrt(batch * iterations))
# 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()
filename = os.path.join(outdir, f"{base_count:05}.png")
Image.fromarray(grid.astype(np.uint8)).save(filename)
for s in seeds:
images.append([filename,s])
images = self._make_grid(samples=all_samples,
seeds=seeds,
batch_size=batch,
iterations=iterations,
outdir=outdir)
toc = time.time()
print(f'{batch * iterations} images generated in',"%4.2fs"% (toc-tic))
return images
# There is lots of shared code between this and txt2img and should be refactored.
def img2img(self,prompt,outdir=None,init_img=None,batch=None,iterations=None,
steps=None,seed=None,grid=None,individual=None,width=None,height=None,
cfg_scale=None,ddim_eta=None,strength=None):
"""
Generate an image from the prompt and the initial image, writing iteration images into the outdir
The output is a list of lists in the format: [[filename1,seed1], [filename2,seed2],...]
"""
outdir = outdir or self.outdir
steps = steps or self.steps
seed = seed or self.seed
cfg_scale = cfg_scale or self.cfg_scale
ddim_eta = ddim_eta or self.ddim_eta
batch = batch or self.batch
iterations = iterations or self.iterations
strength = strength or self.strength
if init_img is None:
print("no init_img provided!")
return []
model = self.load_model() # will instantiate the model or return it from cache
# grid and individual are mutually exclusive, with individual taking priority.
# not necessary, but needed for compatability with dream bot
if (grid is None):
grid = self.grid
if individual:
grid = False
data = [batch * [prompt]]
# PLMS sampler not supported yet, so ignore previous sampler
if self.sampler_name!='ddim':
print(f"sampler '{self.sampler_name}' is not yet supported. Using DDM sampler")
sampler = DDIMSampler(model)
else:
sampler = self.sampler
# make directories and establish names for the output files
os.makedirs(outdir, exist_ok=True)
base_count = len(os.listdir(outdir))-1
assert os.path.isfile(init_img)
init_image = self._load_img(init_img).to(self.device)
init_image = repeat(init_image, '1 ... -> b ...', b=batch)
init_latent = model.get_first_stage_encoding(model.encode_first_stage(init_image)) # move to latent space
sampler.make_schedule(ddim_num_steps=steps, ddim_eta=ddim_eta, verbose=False)
try:
assert 0. <= strength <= 1., 'can only work with strength in [0.0, 1.0]'
except AssertionError:
print(f"strength must be between 0.0 and 1.0, but received value {strength}")
return []
t_enc = int(strength * steps)
print(f"target t_enc is {t_enc} steps")
precision_scope = autocast if self.precision=="autocast" else nullcontext
images = list()
seeds = list()
tic = time.time()
with torch.no_grad():
with precision_scope("cuda"):
with model.ema_scope():
all_samples = list()
for n in trange(iterations, desc="Sampling"):
seed_everything(seed)
for prompts in tqdm(data, desc="data", dynamic_ncols=True):
uc = None
if cfg_scale != 1.0:
uc = model.get_learned_conditioning(batch * [""])
if isinstance(prompts, tuple):
prompts = list(prompts)
c = model.get_learned_conditioning(prompts)
# encode (scaled latent)
z_enc = sampler.stochastic_encode(init_latent, torch.tensor([t_enc]*batch).to(self.device))
# decode it
samples = sampler.decode(z_enc, c, t_enc, unconditional_guidance_scale=cfg_scale,
unconditional_conditioning=uc,)
x_samples = model.decode_first_stage(samples)
x_samples = torch.clamp((x_samples + 1.0) / 2.0, min=0.0, max=1.0)
if not grid:
for x_sample in x_samples:
x_sample = 255. * rearrange(x_sample.cpu().numpy(), 'c h w -> h w c')
filename = os.path.join(outdir, f"{base_count:05}.png")
Image.fromarray(x_sample.astype(np.uint8)).save(filename)
images.append([filename,seed])
base_count += 1
else:
all_samples.append(x_samples)
seeds.append(seed)
seed = self._new_seed()
if grid:
images = self._make_grid(samples=all_samples,
seeds=seeds,
batch_size=batch,
iterations=iterations,
outdir=outdir)
toc = time.time()
print(f'{batch * iterations} images generated in',"%4.2fs"% (toc-tic))
return images
def _make_grid(self,samples,seeds,batch_size,iterations,outdir):
images = list()
base_count = len(os.listdir(outdir))-1
n_rows = batch_size if batch_size>1 else int(math.sqrt(batch_size * iterations))
# save as grid
grid = torch.stack(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()
filename = os.path.join(outdir, f"{base_count:05}.png")
Image.fromarray(grid.astype(np.uint8)).save(filename)
for s in seeds:
images.append([filename,s])
return images
def _new_seed(self):
self.seed = random.randrange(0,np.iinfo(np.uint32).max)
@ -277,3 +403,13 @@ class T2I:
model.eval()
return model
def _load_img(self,path):
image = Image.open(path).convert("RGB")
w, h = image.size
print(f"loaded input image of size ({w}, {h}) from {path}")
w, h = map(lambda x: x - x % 32, (w, h)) # resize to integer multiple of 32
image = image.resize((w, h), resample=Image.Resampling.LANCZOS)
image = np.array(image).astype(np.float32) / 255.0
image = image[None].transpose(0, 3, 1, 2)
image = torch.from_numpy(image)
return 2.*image - 1.

9
scripts/dream.py
View File

@ -92,7 +92,10 @@ def main_loop(t2i,parser,log):
print("Try again with a prompt!")
continue
results = t2i.txt2img(**vars(opt))
if opt.init_img is None:
results = t2i.txt2img(**vars(opt))
else:
results = t2i.img2img(**vars(opt))
print("Outputs:")
write_log_message(opt,switches,results,log)
@ -161,9 +164,11 @@ def create_cmd_parser():
parser.add_argument('-b','--batch',type=int,default=1,help="number of images to produce per sampling (currently broken)")
parser.add_argument('-W','--width',type=int,help="image width, multiple of 64")
parser.add_argument('-H','--height',type=int,help="image height, multiple of 64")
parser.add_argument('-C','--cfg_scale',type=float,help="prompt configuration scale (7.5)")
parser.add_argument('-C','--cfg_scale',default=7.5,type=float,help="prompt configuration scale")
parser.add_argument('-g','--grid',action='store_true',help="generate a grid")
parser.add_argument('-i','--individual',action='store_true',help="generate individual files (default)")
parser.add_argument('-I','--init_img',type=str,help="path to input image (supersedes width and height)")
parser.add_argument('-f','--strength',default=0.75,type=float,help="strength for noising/unnoising. 0.0 preserves image exactly, 1.0 replaces it completely")
return parser
def load_history():