221 lines
9.0 KiB
Python
221 lines
9.0 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright (c) Alibaba, Inc. and its affiliates.
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import copy
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import math
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import numbers
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import random
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import torch
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from scepter.modules.model.network.ldm import LatentDiffusion
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from scepter.modules.model.registry import MODELS, BACKBONES, LOSSES, TOKENIZERS, EMBEDDERS, DIFFUSIONS
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from scepter.modules.model.utils.basic_utils import disabled_train
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from scepter.modules.utils.config import dict_to_yaml
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from scepter.modules.utils.distribute import we
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from scepter.modules.model.utils.basic_utils import count_params
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@MODELS.register_class()
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class LatentDiffusionFlux(LatentDiffusion):
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para_dict = LatentDiffusion.para_dict
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def __init__(self, cfg, logger=None):
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super().__init__(cfg, logger=logger)
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self.guide_scale = cfg.get('GUIDE_SCALE', 3.5)
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def init_params(self):
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self.parameterization = self.cfg.get('PARAMETERIZATION', 'rf')
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assert self.parameterization in [
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'eps', 'x0', 'v', 'rf'
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], 'currently only supporting "eps" and "x0" and "v" and "rf"'
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diffusion_cfg = self.cfg.get("DIFFUSION", None)
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assert diffusion_cfg is not None
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if self.cfg.have("WORK_DIR"):
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diffusion_cfg.WORK_DIR = self.cfg.WORK_DIR
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self.diffusion = DIFFUSIONS.build(diffusion_cfg, logger=self.logger)
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self.pretrained_model = self.cfg.get('PRETRAINED_MODEL', None)
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self.ignore_keys = self.cfg.get('IGNORE_KEYS', [])
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self.model_config = self.cfg.DIFFUSION_MODEL
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self.first_stage_config = self.cfg.FIRST_STAGE_MODEL
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self.cond_stage_config = self.cfg.COND_STAGE_MODEL
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self.tokenizer_config = self.cfg.get('TOKENIZER', None)
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self.loss_config = self.cfg.get('LOSS', None)
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self.scale_factor = self.cfg.get('SCALE_FACTOR', 0.18215)
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self.size_factor = self.cfg.get('SIZE_FACTOR', 16)
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self.default_n_prompt = self.cfg.get('DEFAULT_N_PROMPT', '')
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self.default_n_prompt = '' if self.default_n_prompt is None else self.default_n_prompt
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self.p_zero = self.cfg.get('P_ZERO', 0.0)
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self.train_n_prompt = self.cfg.get('TRAIN_N_PROMPT', '')
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if self.default_n_prompt is None:
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self.default_n_prompt = ''
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if self.train_n_prompt is None:
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self.train_n_prompt = ''
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self.use_ema = self.cfg.get('USE_EMA', False)
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self.model_ema_config = self.cfg.get('DIFFUSION_MODEL_EMA', None)
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def construct_network(self):
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# embedding_context = torch.device("meta") if self.model_config.get("PRETRAINED_MODEL", None) else nullcontext()
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# with embedding_context:
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self.model = BACKBONES.build(self.model_config, logger=self.logger).to(torch.bfloat16)
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self.logger.info('all parameters:{}'.format(count_params(self.model)))
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if self.use_ema:
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if self.model_ema_config:
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self.model_ema = BACKBONES.build(self.model_ema_config,
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logger=self.logger)
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else:
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self.model_ema = copy.deepcopy(self.model)
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self.model_ema = self.model_ema.eval()
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for param in self.model_ema.parameters():
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param.requires_grad = False
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if self.loss_config:
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self.loss = LOSSES.build(self.loss_config, logger=self.logger)
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if self.tokenizer_config is not None:
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self.tokenizer = TOKENIZERS.build(self.tokenizer_config,
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logger=self.logger)
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if self.first_stage_config:
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self.first_stage_model = MODELS.build(self.first_stage_config,
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logger=self.logger)
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self.first_stage_model = self.first_stage_model.eval()
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self.first_stage_model.train = disabled_train
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for param in self.first_stage_model.parameters():
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param.requires_grad = False
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else:
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self.first_stage_model = None
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if self.tokenizer_config is not None:
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self.cond_stage_config.KWARGS = {
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'vocab_size': self.tokenizer.vocab_size
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}
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if self.cond_stage_config == '__is_unconditional__':
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print(
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f'Training {self.__class__.__name__} as an unconditional model.'
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)
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self.cond_stage_model = None
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else:
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model = EMBEDDERS.build(self.cond_stage_config, logger=self.logger)
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self.cond_stage_model = model.eval().requires_grad_(False)
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self.cond_stage_model.train = disabled_train
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def noise_sample(self, num_samples, h, w, seed, dtype = torch.bfloat16):
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noise = torch.randn(
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num_samples,
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16,
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# allow for packing
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2 * math.ceil(h / 16),
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2 * math.ceil(w / 16),
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device=we.device_id,
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dtype=dtype,
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generator=torch.Generator(device=we.device_id).manual_seed(seed),
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)
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return noise
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def forward_train(self, image=None, noise=None, prompt=None, **kwargs):
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x_start = self.encode_first_stage(image, **kwargs)
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if prompt and self.cond_stage_model:
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ctx = getattr(self.cond_stage_model, 'encode')(prompt)
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else:
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assert False
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if 'index' in kwargs:
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kwargs.pop('index')
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guide_scale = self.guide_scale
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if guide_scale is not None:
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guide_scale = torch.full((x_start.shape[0],), guide_scale, device=x_start.device, dtype=x_start.dtype)
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else:
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guide_scale = None
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loss = self.diffusion.loss(x_0=x_start,
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model=self.model,
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model_kwargs={"cond": ctx, "guidance": guide_scale},
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noise=noise,
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**kwargs)
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loss = loss.mean()
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ret = {'loss': loss, 'probe_data': {'prompt': prompt}}
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return ret
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@torch.no_grad()
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def forward_test(self,
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image=None,
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prompt=None,
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sampler='flow_eluer',
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sample_steps=20,
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seed=2023,
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guide_scale=4.5,
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guide_rescale=0.0,
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show_process=False,
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**kwargs):
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seed = seed if seed >= 0 else random.randint(0, 2**32 - 1)
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if isinstance(prompt, str):
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prompt = [prompt]
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assert isinstance(prompt, list)
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num_samples = len(prompt)
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if prompt and self.cond_stage_model:
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ctx = getattr(self.cond_stage_model, 'encode')(prompt)
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else:
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assert False
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if 'index' in kwargs:
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kwargs.pop('index')
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image_size = None
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if 'meta' in kwargs:
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meta = kwargs.pop('meta')
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if 'image_size' in meta:
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h = int(meta['image_size'][0][0])
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w = int(meta['image_size'][1][0])
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image_size = [h, w]
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if 'image_size' in kwargs:
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image_size = kwargs.pop('image_size')
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if isinstance(image_size, numbers.Number):
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image_size = [image_size, image_size]
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if image_size is None:
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image_size = [1024, 1024]
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height, width = image_size
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noise = self.noise_sample(
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num_samples,
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height,
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width,
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seed
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)
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guide_scale = guide_scale or self.guide_scale
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if guide_scale is not None:
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guide_scale = torch.full((noise.shape[0],), guide_scale, device=noise.device, dtype=noise.dtype)
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else:
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guide_scale = None
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# UNet use input n_prompt
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samples = self.diffusion.sample(
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noise=noise,
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sampler=sampler,
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model=self.model,
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model_kwargs= {"cond": ctx, "guidance": guide_scale},
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steps=sample_steps,
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show_progress=True,
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guide_scale = guide_scale,
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return_intermediate=None,
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**kwargs).float()
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with torch.autocast(device_type="cuda", dtype=torch.bfloat16):
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x_samples = self.decode_first_stage(samples).float()
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x_samples = torch.clamp((x_samples + 1.0) / 2.0, min=0.0, max=1.0)
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outputs = list()
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for i, (p, img) in enumerate(zip(prompt, x_samples)):
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one_tup = {'prompt': str(p), 'n_prompt': '', 'image': img}
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outputs.append(one_tup)
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return outputs
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@staticmethod
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def get_config_template():
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return dict_to_yaml('MODEL',
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__class__.__name__,
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LatentDiffusionFlux.para_dict,
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set_name=True)
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@torch.no_grad()
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def encode_first_stage(self, x, **kwargs):
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z = self.first_stage_model.encode(x)
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if isinstance(z, (tuple, list)):
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z = z[0]
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return z
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@torch.no_grad()
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def decode_first_stage(self, z):
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return self.first_stage_model.decode(z)
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