nsr/lsgm/sgm_DiffusionEngine.py

"""
https://github.com/CompVis/stable-diffusion/blob/21f890f9da3cfbeaba8e2ac3c425ee9e998d5229/ldm/models/diffusion/ddpm.py#L30
"""
import copy
import functools
import json
import os
from pathlib import Path
from pdb import set_trace as st
from typing import Any
from click import prompt
import einops
import blobfile as bf
import imageio
import numpy as np
import torch as th
import torch.distributed as dist
import torchvision
from PIL import Image
from torch.nn.parallel.distributed import DistributedDataParallel as DDP
from torch.optim import AdamW
from torch.utils.tensorboard.writer import SummaryWriter
from tqdm import tqdm

from guided_diffusion import dist_util, logger
from guided_diffusion.fp16_util import MixedPrecisionTrainer
from guided_diffusion.nn import update_ema
from guided_diffusion.resample import LossAwareSampler, UniformSampler
# from .train_util import TrainLoop3DRec
from guided_diffusion.train_util import (TrainLoop, calc_average_loss,
                                         find_ema_checkpoint,
                                         find_resume_checkpoint,
                                         get_blob_logdir, log_loss_dict,
                                         log_rec3d_loss_dict,
                                         parse_resume_step_from_filename)
from guided_diffusion.gaussian_diffusion import ModelMeanType

from ldm.modules.encoders.modules import FrozenClipImageEmbedder, TextEmbedder, FrozenCLIPTextEmbedder, FrozenOpenCLIPImagePredictionEmbedder, FrozenOpenCLIPImageEmbedder

import dnnlib
from dnnlib.util import requires_grad
from dnnlib.util import calculate_adaptive_weight

from ..train_util_diffusion import TrainLoop3DDiffusion
from ..cvD.nvsD_canoD import TrainLoop3DcvD_nvsD_canoD

from guided_diffusion.continuous_diffusion_utils import get_mixed_prediction, different_p_q_objectives, kl_per_group_vada, kl_balancer
# from .train_util_diffusion_lsgm_noD_joint import TrainLoop3DDiffusionLSGMJointnoD  # joint diffusion and rec class
# from .controlLDM import TrainLoop3DDiffusionLSGM_Control  # joint diffusion and rec class
from .train_util_diffusion_lsgm_noD_joint import TrainLoop3DDiffusionLSGMJointnoD  # joint diffusion and rec class

# ! add new schedulers from https://github.com/Stability-AI/generative-models

from .crossattn_cldm import TrainLoop3DDiffusionLSGM_crossattn

# import SD stuffs
from typing import Any, Dict, List, Optional, Tuple, Union
from contextlib import contextmanager
from omegaconf import ListConfig, OmegaConf
from sgm.modules import UNCONDITIONAL_CONFIG

from sgm.util import (default, disabled_train, get_obj_from_str,
                      instantiate_from_config, log_txt_as_img)

# from sgm.sampling_utils.demo.streamlit_helpers import init_sampling


class DiffusionEngineLSGM(TrainLoop3DDiffusionLSGM_crossattn):

    def __init__(
        self,
        *,
        rec_model,
        denoise_model,
        diffusion,
        sde_diffusion,
        control_model,
        control_key,
        only_mid_control,
        loss_class,
        data,
        eval_data,
        batch_size,
        microbatch,
        lr,
        ema_rate,
        log_interval,
        eval_interval,
        save_interval,
        resume_checkpoint,
        resume_cldm_checkpoint=None,
        use_fp16=False,
        fp16_scale_growth=0.001,
        schedule_sampler=None,
        weight_decay=0,
        lr_anneal_steps=0,
        iterations=10001,
        ignore_resume_opt=False,
        freeze_ae=False,
        denoised_ae=True,
        triplane_scaling_divider=10,
        use_amp=False,
        diffusion_input_size=224,
        normalize_clip_encoding=False,
        scale_clip_encoding=1,
        cfg_dropout_prob=0,
        cond_key='img_sr',
        use_eos_feature=False,
        compile=False,
        # denoiser_config,
        # conditioner_config: Union[None, Dict, ListConfig,
        #                           OmegaConf] = None,
        # sampler_config: Union[None, Dict, ListConfig, OmegaConf] = None,
        # loss_fn_config: Union[None, Dict, ListConfig, OmegaConf] = None,
        **kwargs):
        super().__init__(rec_model=rec_model,
                         denoise_model=denoise_model,
                         diffusion=diffusion,
                         sde_diffusion=sde_diffusion,
                         control_model=control_model,
                         control_key=control_key,
                         only_mid_control=only_mid_control,
                         loss_class=loss_class,
                         data=data,
                         eval_data=eval_data,
                         batch_size=batch_size,
                         microbatch=microbatch,
                         lr=lr,
                         ema_rate=ema_rate,
                         log_interval=log_interval,
                         eval_interval=eval_interval,
                         save_interval=save_interval,
                         resume_checkpoint=resume_checkpoint,
                         resume_cldm_checkpoint=resume_cldm_checkpoint,
                         use_fp16=use_fp16,
                         fp16_scale_growth=fp16_scale_growth,
                         schedule_sampler=schedule_sampler,
                         weight_decay=weight_decay,
                         lr_anneal_steps=lr_anneal_steps,
                         iterations=iterations,
                         ignore_resume_opt=ignore_resume_opt,
                         freeze_ae=freeze_ae,
                         denoised_ae=denoised_ae,
                         triplane_scaling_divider=triplane_scaling_divider,
                         use_amp=use_amp,
                         diffusion_input_size=diffusion_input_size,
                         normalize_clip_encoding=normalize_clip_encoding,
                         scale_clip_encoding=scale_clip_encoding,
                         cfg_dropout_prob=cfg_dropout_prob,
                         cond_key=cond_key,
                         use_eos_feature=use_eos_feature,
                         compile=compile,
                         **kwargs)

        #  ! sgm diffusion pipeline
        ldm_configs = OmegaConf.load(
            'sgm/configs/txt2img-clipl-compat.yaml')['ldm_configs']

        self.loss_fn = (
            instantiate_from_config(ldm_configs.loss_fn_config)
            # if loss_fn_config is not None
            # else None
        )
        self.denoiser = instantiate_from_config(
            ldm_configs.denoiser_config).to(dist_util.dev())
        self.sampler = (instantiate_from_config(ldm_configs.sampler_config))

        self.conditioner = instantiate_from_config(
            default(ldm_configs.conditioner_config,
                    UNCONDITIONAL_CONFIG)).to(dist_util.dev())

    # ! already merged
    def prepare_ddpm(self, eps, mode='p'):
        raise NotImplementedError('already implemented in self.denoiser')

    # merged from noD.py

    # use sota denoiser, loss_fn etc.
    def ldm_train_step(self, batch, behaviour='cano', *args, **kwargs):
        """
        add sds grad to all ae predicted x_0 
        """

        # ! enable the gradient of both models
        requires_grad(self.ddpm_model, True)

        self.mp_trainer.zero_grad()  # !!!!

        if 'img' in batch:
            batch_size = batch['img'].shape[0]
        else:
            batch_size = len(batch['caption'])

        for i in range(0, batch_size, self.microbatch):

            micro = {
                k:
                v[i:i + self.microbatch].to(dist_util.dev()) if isinstance(
                    v, th.Tensor) else v
                for k, v in batch.items()
            }

            # =================================== ae part ===================================
            # with th.cuda.amp.autocast(dtype=th.bfloat16,
            with th.cuda.amp.autocast(dtype=self.dtype,
                                      enabled=self.mp_trainer.use_amp):

                loss = th.tensor(0.).to(dist_util.dev())

                if 'latent' in micro:
                    vae_out = {self.latent_name: micro['latent']}
                else:
                    vae_out = self.ddp_rec_model(
                        img=micro['img_to_encoder'],
                        c=micro['c'],
                        behaviour='encoder_vae',
                    )  # pred: (B, 3, 64, 64)

                eps = vae_out[self.latent_name] / self.triplane_scaling_divider
                # eps = vae_out.pop(self.latent_name)

                # if 'bg_plane' in vae_out:
                #     eps = th.cat((eps, vae_out['bg_plane']),
                #                  dim=1)  # include background, B 12+4 32 32

                # ! SD loss
                # cond = self.get_c_input(micro, bs=eps.shape[0])
                loss, loss_other_info = self.loss_fn(self.ddp_ddpm_model,
                                                     self.denoiser,
                                                     self.conditioner, eps,
                                                     micro)  # type: ignore
                loss = loss.mean()
                log_rec3d_loss_dict({})

                log_rec3d_loss_dict({
                    'eps_mean':
                    eps.mean(),
                    'eps_std':
                    eps.std([1, 2, 3]).mean(0),
                    'pred_x0_std':
                    loss_other_info['model_output'].std([1, 2, 3]).mean(0),
                    "p_loss":
                    loss,
                })

            self.mp_trainer.backward(loss)  # joint gradient descent

        # update ddpm accordingly
        self.mp_trainer.optimize(self.opt)

        if dist_util.get_rank() == 0 and self.step % 500 == 0:
            self.log_control_images(vae_out, micro, loss_other_info)

    @th.inference_mode()
    def log_control_images(self, vae_out, micro, ddpm_ret):

        # eps_t_p, t_p, logsnr_p = (p_sample_batch[k] for k in (
        #     'eps_t_p',
        #     't_p',
        #     'logsnr_p',
        # ))
        # pred_eps_p = ddpm_ret['pred_eps_p']

        if 'posterior' in vae_out:
            vae_out.pop('posterior')  # for calculating kl loss
        # vae_out_for_pred = {
        #     k: v[0:1].to(dist_util.dev()) if isinstance(v, th.Tensor) else v
        #     for k, v in vae_out.items()
        # }
        vae_out_for_pred = {self.latent_name: vae_out[self.latent_name][0:1].to(self.dtype)}

        with th.cuda.amp.autocast(dtype=self.dtype,
                                    enabled=self.mp_trainer.use_amp):
            pred = self.ddp_rec_model(latent=vae_out_for_pred,
                                    c=micro['c'][0:1],
                                    behaviour=self.render_latent_behaviour)

        assert isinstance(pred, dict)

        pred_img = pred['image_raw']
        if 'img' in micro:
            gt_img = micro['img']
        else:
            gt_img = th.zeros_like(pred['image_raw'])

        if 'depth' in micro:
            gt_depth = micro['depth']
            if gt_depth.ndim == 3:
                gt_depth = gt_depth.unsqueeze(1)
            gt_depth = (gt_depth - gt_depth.min()) / (gt_depth.max() -
                                                      gt_depth.min())
        else:
            gt_depth = th.zeros_like(gt_img[:, 0:1, ...])

        if 'image_depth' in pred:
            pred_depth = pred['image_depth']
            pred_depth = (pred_depth - pred_depth.min()) / (pred_depth.max() -
                                                            pred_depth.min())
        else:
            pred_depth = th.zeros_like(gt_depth)

        gt_img = self.pool_128(gt_img)
        gt_depth = self.pool_128(gt_depth)
        # cond = self.get_c_input(micro)
        # hint = th.cat(cond['c_concat'], 1)

        gt_vis = th.cat(
            [
                gt_img,
                gt_img,
                gt_img,
                # self.pool_128(hint),
                # gt_img,
                gt_depth.repeat_interleave(3, dim=1)
            ],
            dim=-1)[0:1]  # TODO, fail to load depth. range [0, 1]

        # eps_t_p_3D = eps_t_p.reshape(batch_size, eps_t_p.shape[1]//3, 3, -1) # B C 3 L

        noised_latent, sigmas, x_start = [
            ddpm_ret[k] for k in ['noised_input', 'sigmas', 'model_output']
        ]

        noised_latent = {
            'latent_normalized_2Ddiffusion':
            noised_latent[0:1].to(self.dtype) * self.triplane_scaling_divider,
        }

        denoised_latent = {
            'latent_normalized_2Ddiffusion':
            x_start[0:1].to(self.dtype) * self.triplane_scaling_divider,
        }
         
        with th.cuda.amp.autocast(dtype=self.dtype,
                                    enabled=self.mp_trainer.use_amp):
            noised_ae_pred = self.ddp_rec_model(
                img=None,
                c=micro['c'][0:1],
                latent=noised_latent,
                behaviour=self.render_latent_behaviour)

            # pred_x0 = self.sde_diffusion._predict_x0_from_eps(
            # eps_t_p, pred_eps_p, logsnr_p)  # for VAE loss, denosied latent

            # pred_xstart_3D
            denoised_ae_pred = self.ddp_rec_model(
                img=None,
                c=micro['c'][0:1],
                latent=denoised_latent,
                # latent=pred_x0[0:1] * self.
                # triplane_scaling_divider,  # TODO, how to define the scale automatically?
                behaviour=self.render_latent_behaviour)

        pred_vis = th.cat(
            [
                self.pool_128(img) for img in (
                    pred_img[0:1],
                    noised_ae_pred['image_raw'][0:1],
                    denoised_ae_pred['image_raw'][0:1],  # controlnet result
                    pred_depth[0:1].repeat_interleave(3, dim=1))
            ],
            dim=-1)  # B, 3, H, W

        if 'img' in micro:
            vis = th.cat([gt_vis, pred_vis],
                         dim=-2)[0].permute(1, 2,
                                            0).cpu()  # ! pred in range[-1, 1]
        else:
            vis = pred_vis[0].permute(1, 2, 0).cpu()

        # vis_grid = torchvision.utils.make_grid(vis) # HWC
        vis = vis.numpy() * 127.5 + 127.5
        vis = vis.clip(0, 255).astype(np.uint8)
        img_save_path = f'{logger.get_dir()}/{self.step+self.resume_step}denoised_{sigmas[0].item():3}.jpg'
        Image.fromarray(vis).save(img_save_path)

        # if self.cond_key == 'caption':
        #     with open(f'{logger.get_dir()}/{self.step+self.resume_step}caption_{t_p[0].item():3}.txt', 'w') as f:
        #         f.write(micro['caption'][0])

        print('log denoised vis to: ', img_save_path)

        th.cuda.empty_cache()

    @th.no_grad()
    def sample(
        self,
        cond: Dict,
        uc: Union[Dict, None] = None,
        batch_size: int = 16,
        shape: Union[None, Tuple, List] = None,
        idx_to_render=None, 
        **kwargs,
    ):
        randn = th.randn(batch_size, *shape).to(self.dtype).to(dist_util.dev())

        if idx_to_render is not None:
            randn = randn[idx_to_render]

        with th.cuda.amp.autocast(dtype=self.dtype,
                                    enabled=self.mp_trainer.use_amp):

            denoiser = lambda input, sigma, c: self.denoiser(
                self.model, input, sigma, c, **kwargs)
            samples = self.sampler(denoiser, randn, cond, uc=uc)

        return samples

    @th.inference_mode()
    def eval_cldm(
        self,
        prompt="",
        use_ddim=False,
        unconditional_guidance_scale=1.0,
        save_img=False,
        use_train_trajectory=False,
        camera=None,
        num_samples=1,
        num_instances=1,
        export_mesh=False, # TODO
        idx_to_render=None,
    ):
        # ! slightly modified for new API. combined with
        # /cpfs01/shared/V2V/V2V_hdd/yslan/Repo/generative-models/sgm/models/diffusion.py:249 log_images()
        # TODO, support batch_size > 1

        self.ddpm_model.eval()

        args = dnnlib.EasyDict(
            dict(
                batch_size=1,
                image_size=self.diffusion_input_size,
                denoise_in_channels=self.rec_model.decoder.triplane_decoder.
                out_chans,  # type: ignore
                clip_denoised=False,
                class_cond=False,
                use_ddim=use_ddim))

        model_kwargs = {}

        uc = None
        log = dict()

        ucg_keys = [self.cond_key]

        batch_c = {self.cond_key: prompt}

        c, uc = self.conditioner.get_unconditional_conditioning(
            batch_c,
            force_uc_zero_embeddings=ucg_keys
            if len(self.conditioner.embedders) > 0 else [],
        )

        sampling_kwargs = {'idx_to_render': idx_to_render}

        # N = 32
        th.manual_seed(41) # fix randn seed for all prompt
        N = num_samples
        z_shape = (
            num_samples,
            self.ddpm_model.in_channels if not self.ddpm_model.roll_out else
            3 * self.ddpm_model.in_channels,  # type: ignore
            self.diffusion_input_size,
            self.diffusion_input_size)


        for k in c:
            if isinstance(c[k], th.Tensor):
                # c[k], uc[k] = map(lambda y: y[k][:N].to(dist_util.dev()),
                #                   (c, uc))
                assert c[k].shape[0] == 1
                if idx_to_render is not None:
                    c[k], uc[k] = map(lambda y: y[k].repeat_interleave(idx_to_render.shape[0], 0).to(self.dtype).to(dist_util.dev()),
                                    (c, uc)) # support bs>1 sampling given a condition
                else: 
                    c[k], uc[k] = map(lambda y: y[k].repeat_interleave(N, 0).to(self.dtype).to(dist_util.dev()),
                                    (c, uc)) # support bs>1 sampling given a condition

        samples = self.sample(c,
                              shape=z_shape[1:],
                              uc=uc,
                              batch_size=N,
                              **sampling_kwargs)
        # st() # do rendering first

        # ! get c

        if self.cond_key == 'caption':
            if camera is not None:
                batch = {'c': camera.clone()}
            prefix = prompt
        else:
            prefix = ''
            if use_train_trajectory:
                batch = next(iter(self.data))
            else:
                try:
                    batch = next(self.eval_data)
                except Exception as e:
                    self.eval_data = iter(self.eval_data)
                    batch = next(self.eval_data)

            if camera is not None:
                batch['c'] = camera.clone()

        # rendering
        for i in range(samples.shape[0]):
            th.cuda.empty_cache()

            # ! render sampled latent

            with th.cuda.amp.autocast(dtype=self.dtype,
                                        enabled=self.mp_trainer.use_amp):

                self.render_video_given_triplane(
                    samples[i:i+1].to(self.dtype),
                    self.rec_model,  # compatible with join_model
                    name_prefix=
                    f'{self.step + self.resume_step}{prefix}_{i}',
                    save_img=save_img,
                    render_reference=batch,
                    export_mesh=export_mesh, 
                    render_all=True)

        self.ddpm_model.train()