import torch.multiprocessing as mp import torch.nn as nn import torch.optim as optim import torch.utils.data import argparse from model.unet import get_model from torch.distributions import Normal from utils.file_utils import * from utils.visualize import * from model.pvcnn_generation import PVCNN2Base import torch.distributed as dist from datasets.shapenet_data_pc import ShapeNet15kPointClouds ''' some utils ''' def rotation_matrix(axis, theta): """ Return the rotation matrix associated with counterclockwise rotation about the given axis by theta radians. """ axis = np.asarray(axis) axis = axis / np.sqrt(np.dot(axis, axis)) a = np.cos(theta / 2.0) b, c, d = -axis * np.sin(theta / 2.0) aa, bb, cc, dd = a * a, b * b, c * c, d * d bc, ad, ac, ab, bd, cd = b * c, a * d, a * c, a * b, b * d, c * d return np.array([[aa + bb - cc - dd, 2 * (bc + ad), 2 * (bd - ac)], [2 * (bc - ad), aa + cc - bb - dd, 2 * (cd + ab)], [2 * (bd + ac), 2 * (cd - ab), aa + dd - bb - cc]]) def rotate(vertices, faces): ''' vertices: [numpoints, 3] ''' M = rotation_matrix([0, 1, 0], np.pi / 2).transpose() N = rotation_matrix([1, 0, 0], -np.pi / 4).transpose() K = rotation_matrix([0, 0, 1], np.pi).transpose() v, f = vertices[:,[1,2,0]].dot(M).dot(N).dot(K), faces[:,[1,2,0]] return v, f def norm(v, f): v = (v - v.min())/(v.max() - v.min()) - 0.5 return v, f def getGradNorm(net): pNorm = torch.sqrt(sum(torch.sum(p ** 2) for p in net.parameters())) gradNorm = torch.sqrt(sum(torch.sum(p.grad ** 2) for p in net.parameters())) return pNorm, gradNorm def weights_init(m): """ xavier initialization """ classname = m.__class__.__name__ if classname.find('Conv') != -1 and m.weight is not None: torch.nn.init.xavier_normal_(m.weight) elif classname.find('BatchNorm') != -1: m.weight.data.normal_() m.bias.data.fill_(0) ''' models ''' def normal_kl(mean1, logvar1, mean2, logvar2): """ KL divergence between normal distributions parameterized by mean and log-variance. """ return 0.5 * (-1.0 + logvar2 - logvar1 + torch.exp(logvar1 - logvar2) + (mean1 - mean2)**2 * torch.exp(-logvar2)) def discretized_gaussian_log_likelihood(x, *, means, log_scales): # Assumes data is integers [0, 1] assert x.shape == means.shape == log_scales.shape px0 = Normal(torch.zeros_like(means), torch.ones_like(log_scales)) centered_x = x - means inv_stdv = torch.exp(-log_scales) plus_in = inv_stdv * (centered_x + 0.5) cdf_plus = px0.cdf(plus_in) min_in = inv_stdv * (centered_x - .5) cdf_min = px0.cdf(min_in) log_cdf_plus = torch.log(torch.max(cdf_plus, torch.ones_like(cdf_plus)*1e-12)) log_one_minus_cdf_min = torch.log(torch.max(1. - cdf_min, torch.ones_like(cdf_min)*1e-12)) cdf_delta = cdf_plus - cdf_min log_probs = torch.where( x < 0.001, log_cdf_plus, torch.where(x > 0.999, log_one_minus_cdf_min, torch.log(torch.max(cdf_delta, torch.ones_like(cdf_delta)*1e-12)))) assert log_probs.shape == x.shape return log_probs class GaussianDiffusion: def __init__(self,betas, loss_type, model_mean_type, model_var_type): self.loss_type = loss_type self.model_mean_type = model_mean_type self.model_var_type = model_var_type assert isinstance(betas, np.ndarray) self.np_betas = betas = betas.astype(np.float64) # computations here in float64 for accuracy assert (betas > 0).all() and (betas <= 1).all() timesteps, = betas.shape self.num_timesteps = int(timesteps) # initialize twice the actual length so we can keep running for eval # betas = np.concatenate([betas, np.full_like(betas[:int(0.2*len(betas))], betas[-1])]) alphas = 1. - betas alphas_cumprod = torch.from_numpy(np.cumprod(alphas, axis=0)).float() alphas_cumprod_prev = torch.from_numpy(np.append(1., alphas_cumprod[:-1])).float() self.betas = torch.from_numpy(betas).float() self.alphas_cumprod = alphas_cumprod.float() self.alphas_cumprod_prev = alphas_cumprod_prev.float() # calculations for diffusion q(x_t | x_{t-1}) and others self.sqrt_alphas_cumprod = torch.sqrt(alphas_cumprod).float() self.sqrt_one_minus_alphas_cumprod = torch.sqrt(1. - alphas_cumprod).float() self.log_one_minus_alphas_cumprod = torch.log(1. - alphas_cumprod).float() self.sqrt_recip_alphas_cumprod = torch.sqrt(1. / alphas_cumprod).float() self.sqrt_recipm1_alphas_cumprod = torch.sqrt(1. / alphas_cumprod - 1).float() betas = torch.from_numpy(betas).float() alphas = torch.from_numpy(alphas).float() # calculations for posterior q(x_{t-1} | x_t, x_0) posterior_variance = betas * (1. - alphas_cumprod_prev) / (1. - alphas_cumprod) # above: equal to 1. / (1. / (1. - alpha_cumprod_tm1) + alpha_t / beta_t) self.posterior_variance = posterior_variance # below: log calculation clipped because the posterior variance is 0 at the beginning of the diffusion chain self.posterior_log_variance_clipped = torch.log(torch.max(posterior_variance, 1e-20 * torch.ones_like(posterior_variance))) self.posterior_mean_coef1 = betas * torch.sqrt(alphas_cumprod_prev) / (1. - alphas_cumprod) self.posterior_mean_coef2 = (1. - alphas_cumprod_prev) * torch.sqrt(alphas) / (1. - alphas_cumprod) @staticmethod def _extract(a, t, x_shape): """ Extract some coefficients at specified timesteps, then reshape to [batch_size, 1, 1, 1, 1, ...] for broadcasting purposes. """ bs, = t.shape assert x_shape[0] == bs out = torch.gather(a, 0, t) assert out.shape == torch.Size([bs]) return torch.reshape(out, [bs] + ((len(x_shape) - 1) * [1])) def q_mean_variance(self, x_start, t): mean = self._extract(self.sqrt_alphas_cumprod.to(x_start.device), t, x_start.shape) * x_start variance = self._extract(1. - self.alphas_cumprod.to(x_start.device), t, x_start.shape) log_variance = self._extract(self.log_one_minus_alphas_cumprod.to(x_start.device), t, x_start.shape) return mean, variance, log_variance def q_sample(self, x_start, t, noise=None): """ Diffuse the data (t == 0 means diffused for 1 step) """ if noise is None: noise = torch.randn(x_start.shape, device=x_start.device) assert noise.shape == x_start.shape return ( self._extract(self.sqrt_alphas_cumprod.to(x_start.device), t, x_start.shape) * x_start + self._extract(self.sqrt_one_minus_alphas_cumprod.to(x_start.device), t, x_start.shape) * noise ) def q_posterior_mean_variance(self, x_start, x_t, t): """ Compute the mean and variance of the diffusion posterior q(x_{t-1} | x_t, x_0) """ assert x_start.shape == x_t.shape posterior_mean = ( self._extract(self.posterior_mean_coef1.to(x_start.device), t, x_t.shape) * x_start + self._extract(self.posterior_mean_coef2.to(x_start.device), t, x_t.shape) * x_t ) posterior_variance = self._extract(self.posterior_variance.to(x_start.device), t, x_t.shape) posterior_log_variance_clipped = self._extract(self.posterior_log_variance_clipped.to(x_start.device), t, x_t.shape) assert (posterior_mean.shape[0] == posterior_variance.shape[0] == posterior_log_variance_clipped.shape[0] == x_start.shape[0]) return posterior_mean, posterior_variance, posterior_log_variance_clipped def p_mean_variance(self, denoise_fn, data, t, clip_denoised: bool, return_pred_xstart: bool): model_output = denoise_fn(data, t) if self.model_var_type in ['fixedsmall', 'fixedlarge']: # below: only log_variance is used in the KL computations model_variance, model_log_variance = { # for fixedlarge, we set the initial (log-)variance like so to get a better decoder log likelihood 'fixedlarge': (self.betas.to(data.device), torch.log(torch.cat([self.posterior_variance[1:2], self.betas[1:]])).to(data.device)), 'fixedsmall': (self.posterior_variance.to(data.device), self.posterior_log_variance_clipped.to(data.device)), }[self.model_var_type] model_variance = self._extract(model_variance, t, data.shape) * torch.ones_like(data) model_log_variance = self._extract(model_log_variance, t, data.shape) * torch.ones_like(data) else: raise NotImplementedError(self.model_var_type) if self.model_mean_type == 'eps': x_recon = self._predict_xstart_from_eps(data, t=t, eps=model_output) if clip_denoised: x_recon = torch.clamp(x_recon, -.5, .5) model_mean, _, _ = self.q_posterior_mean_variance(x_start=x_recon, x_t=data, t=t) else: raise NotImplementedError(self.loss_type) assert model_mean.shape == x_recon.shape == data.shape assert model_variance.shape == model_log_variance.shape == data.shape if return_pred_xstart: return model_mean, model_variance, model_log_variance, x_recon else: return model_mean, model_variance, model_log_variance def _predict_xstart_from_eps(self, x_t, t, eps): assert x_t.shape == eps.shape return ( self._extract(self.sqrt_recip_alphas_cumprod.to(x_t.device), t, x_t.shape) * x_t - self._extract(self.sqrt_recipm1_alphas_cumprod.to(x_t.device), t, x_t.shape) * eps ) ''' samples ''' def p_sample(self, denoise_fn, data, t, noise_fn, clip_denoised=False, return_pred_xstart=False): """ Sample from the model """ model_mean, _, model_log_variance, pred_xstart = self.p_mean_variance(denoise_fn, data=data, t=t, clip_denoised=clip_denoised, return_pred_xstart=True) noise = noise_fn(size=data.shape, dtype=data.dtype, device=data.device) assert noise.shape == data.shape # no noise when t == 0 nonzero_mask = torch.reshape(1 - (t == 0).float(), [data.shape[0]] + [1] * (len(data.shape) - 1)) sample = model_mean + nonzero_mask * torch.exp(0.5 * model_log_variance) * noise assert sample.shape == pred_xstart.shape return (sample, pred_xstart) if return_pred_xstart else sample def p_sample_loop(self, denoise_fn, shape, device, noise_fn=torch.randn, clip_denoised=True, keep_running=False): """ Generate samples keep_running: True if we run 2 x num_timesteps, False if we just run num_timesteps """ assert isinstance(shape, (tuple, list)) img_t = noise_fn(size=shape, dtype=torch.float, device=device) for t in reversed(range(0, self.num_timesteps if not keep_running else len(self.betas))): t_ = torch.empty(shape[0], dtype=torch.int64, device=device).fill_(t) img_t = self.p_sample(denoise_fn=denoise_fn, data=img_t,t=t_, noise_fn=noise_fn, clip_denoised=clip_denoised, return_pred_xstart=False) assert img_t.shape == shape return img_t def p_sample_loop_trajectory(self, denoise_fn, shape, device, freq, noise_fn=torch.randn,clip_denoised=True, keep_running=False): """ Generate samples, returning intermediate images Useful for visualizing how denoised images evolve over time Args: repeat_noise_steps (int): Number of denoising timesteps in which the same noise is used across the batch. If >= 0, the initial noise is the same for all batch elemements. """ assert isinstance(shape, (tuple, list)) total_steps = self.num_timesteps if not keep_running else len(self.betas) img_t = noise_fn(size=shape, dtype=torch.float, device=device) imgs = [img_t] for t in reversed(range(0,total_steps)): t_ = torch.empty(shape[0], dtype=torch.int64, device=device).fill_(t) img_t = self.p_sample(denoise_fn=denoise_fn, data=img_t, t=t_, noise_fn=noise_fn, clip_denoised=clip_denoised, return_pred_xstart=False) if t % freq == 0 or t == total_steps-1: imgs.append(img_t) assert imgs[-1].shape == shape return imgs '''losses''' def _vb_terms_bpd(self, denoise_fn, data_start, data_t, t, clip_denoised: bool, return_pred_xstart: bool): true_mean, _, true_log_variance_clipped = self.q_posterior_mean_variance(x_start=data_start, x_t=data_t, t=t) model_mean, _, model_log_variance, pred_xstart = self.p_mean_variance( denoise_fn, data=data_t, t=t, clip_denoised=clip_denoised, return_pred_xstart=True) kl = normal_kl(true_mean, true_log_variance_clipped, model_mean, model_log_variance) kl = kl.mean(dim=list(range(1, len(data_start.shape)))) / np.log(2.) return (kl, pred_xstart) if return_pred_xstart else kl def p_losses(self, denoise_fn, data_start, t, noise=None): """ Training loss calculation """ B, D, N = data_start.shape assert t.shape == torch.Size([B]) if noise is None: noise = torch.randn(data_start.shape, dtype=data_start.dtype, device=data_start.device) assert noise.shape == data_start.shape and noise.dtype == data_start.dtype data_t = self.q_sample(x_start=data_start, t=t, noise=noise) if self.loss_type == 'mse': # predict the noise instead of x_start. seems to be weighted naturally like SNR eps_recon = denoise_fn(data_t, t) assert data_t.shape == data_start.shape assert eps_recon.shape == torch.Size([B, D, N]) assert eps_recon.shape == data_start.shape losses = ((noise - eps_recon)**2).mean(dim=list(range(1, len(data_start.shape)))) elif self.loss_type == 'kl': losses = self._vb_terms_bpd( denoise_fn=denoise_fn, data_start=data_start, data_t=data_t, t=t, clip_denoised=False, return_pred_xstart=False) else: raise NotImplementedError(self.loss_type) assert losses.shape == torch.Size([B]) return losses '''debug''' def _prior_bpd(self, x_start): with torch.no_grad(): B, T = x_start.shape[0], self.num_timesteps t_ = torch.empty(B, dtype=torch.int64, device=x_start.device).fill_(T-1) qt_mean, _, qt_log_variance = self.q_mean_variance(x_start, t=t_) kl_prior = normal_kl(mean1=qt_mean, logvar1=qt_log_variance, mean2=torch.tensor([0.]).to(qt_mean), logvar2=torch.tensor([0.]).to(qt_log_variance)) assert kl_prior.shape == x_start.shape return kl_prior.mean(dim=list(range(1, len(kl_prior.shape)))) / np.log(2.) def calc_bpd_loop(self, denoise_fn, x_start, clip_denoised=True): with torch.no_grad(): B, T = x_start.shape[0], self.num_timesteps vals_bt_, mse_bt_= torch.zeros([B, T], device=x_start.device), torch.zeros([B, T], device=x_start.device) for t in reversed(range(T)): t_b = torch.empty(B, dtype=torch.int64, device=x_start.device).fill_(t) # Calculate VLB term at the current timestep new_vals_b, pred_xstart = self._vb_terms_bpd( denoise_fn, data_start=x_start, data_t=self.q_sample(x_start=x_start, t=t_b), t=t_b, clip_denoised=clip_denoised, return_pred_xstart=True) # MSE for progressive prediction loss assert pred_xstart.shape == x_start.shape new_mse_b = ((pred_xstart-x_start)**2).mean(dim=list(range(1, len(x_start.shape)))) assert new_vals_b.shape == new_mse_b.shape == torch.Size([B]) # Insert the calculated term into the tensor of all terms mask_bt = t_b[:, None]==torch.arange(T, device=t_b.device)[None, :].float() vals_bt_ = vals_bt_ * (~mask_bt) + new_vals_b[:, None] * mask_bt mse_bt_ = mse_bt_ * (~mask_bt) + new_mse_b[:, None] * mask_bt assert mask_bt.shape == vals_bt_.shape == vals_bt_.shape == torch.Size([B, T]) prior_bpd_b = self._prior_bpd(x_start) total_bpd_b = vals_bt_.sum(dim=1) + prior_bpd_b assert vals_bt_.shape == mse_bt_.shape == torch.Size([B, T]) and \ total_bpd_b.shape == prior_bpd_b.shape == torch.Size([B]) return total_bpd_b.mean(), vals_bt_.mean(), prior_bpd_b.mean(), mse_bt_.mean() class PVCNN2(PVCNN2Base): sa_blocks = [ ((32, 2, 32), (1024, 0.1, 32, (32, 64))), ((64, 3, 16), (256, 0.2, 32, (64, 128))), ((128, 3, 8), (64, 0.4, 32, (128, 256))), (None, (16, 0.8, 32, (256, 256, 512))), ] fp_blocks = [ ((256, 256), (256, 3, 8)), ((256, 256), (256, 3, 8)), ((256, 128), (128, 2, 16)), ((128, 128, 64), (64, 2, 32)), ] def __init__(self, num_classes, embed_dim, use_att,dropout, extra_feature_channels=3, width_multiplier=1, voxel_resolution_multiplier=1): super().__init__( num_classes=num_classes, embed_dim=embed_dim, use_att=use_att, dropout=dropout, extra_feature_channels=extra_feature_channels, width_multiplier=width_multiplier, voxel_resolution_multiplier=voxel_resolution_multiplier ) class Model(nn.Module): def __init__(self, args, betas, loss_type: str, model_mean_type: str, model_var_type:str): super(Model, self).__init__() self.diffusion = GaussianDiffusion(betas, loss_type, model_mean_type, model_var_type) self.model = PVCNN2(num_classes=args.nc, embed_dim=args.embed_dim, use_att=args.attention, dropout=args.dropout, extra_feature_channels=0) def prior_kl(self, x0): return self.diffusion._prior_bpd(x0) def all_kl(self, x0, clip_denoised=True): total_bpd_b, vals_bt, prior_bpd_b, mse_bt = self.diffusion.calc_bpd_loop(self._denoise, x0, clip_denoised) return { 'total_bpd_b': total_bpd_b, 'terms_bpd': vals_bt, 'prior_bpd_b': prior_bpd_b, 'mse_bt':mse_bt } def _denoise(self, data, t): B, D,N= data.shape assert data.dtype == torch.float assert t.shape == torch.Size([B]) and t.dtype == torch.int64 out = self.model(data, t) assert out.shape == torch.Size([B, D, N]) return out def get_loss_iter(self, data, noises=None): B, D, N = data.shape t = torch.randint(0, self.diffusion.num_timesteps, size=(B,), device=data.device) if noises is not None: noises[t!=0] = torch.randn((t!=0).sum(), *noises.shape[1:]).to(noises) losses = self.diffusion.p_losses( denoise_fn=self._denoise, data_start=data, t=t, noise=noises) assert losses.shape == t.shape == torch.Size([B]) return losses def gen_samples(self, shape, device, noise_fn=torch.randn, clip_denoised=True, keep_running=False): return self.diffusion.p_sample_loop(self._denoise, shape=shape, device=device, noise_fn=noise_fn, clip_denoised=clip_denoised, keep_running=keep_running) def gen_sample_traj(self, shape, device, freq, noise_fn=torch.randn, clip_denoised=True,keep_running=False): return self.diffusion.p_sample_loop_trajectory(self._denoise, shape=shape, device=device, noise_fn=noise_fn, freq=freq, clip_denoised=clip_denoised, keep_running=keep_running) def train(self): self.model.train() def eval(self): self.model.eval() def multi_gpu_wrapper(self, f): self.model = f(self.model) def get_betas(schedule_type, b_start, b_end, time_num): if schedule_type == 'linear': betas = np.linspace(b_start, b_end, time_num) elif schedule_type == 'warm0.1': betas = b_end * np.ones(time_num, dtype=np.float64) warmup_time = int(time_num * 0.1) betas[:warmup_time] = np.linspace(b_start, b_end, warmup_time, dtype=np.float64) elif schedule_type == 'warm0.2': betas = b_end * np.ones(time_num, dtype=np.float64) warmup_time = int(time_num * 0.2) betas[:warmup_time] = np.linspace(b_start, b_end, warmup_time, dtype=np.float64) elif schedule_type == 'warm0.5': betas = b_end * np.ones(time_num, dtype=np.float64) warmup_time = int(time_num * 0.5) betas[:warmup_time] = np.linspace(b_start, b_end, warmup_time, dtype=np.float64) else: raise NotImplementedError(schedule_type) return betas def get_dataset(dataroot, npoints,category): tr_dataset = ShapeNet15kPointClouds(root_dir=dataroot, categories=[category], split='train', tr_sample_size=npoints, te_sample_size=npoints, scale=1., normalize_per_shape=False, normalize_std_per_axis=False, random_subsample=True) te_dataset = ShapeNet15kPointClouds(root_dir=dataroot, categories=[category], split='val', tr_sample_size=npoints, te_sample_size=npoints, scale=1., normalize_per_shape=False, normalize_std_per_axis=False, all_points_mean=tr_dataset.all_points_mean, all_points_std=tr_dataset.all_points_std, ) return tr_dataset, te_dataset def get_dataloader(opt, train_dataset, test_dataset=None): if opt.distribution_type == 'multi': train_sampler = torch.utils.data.distributed.DistributedSampler( train_dataset, num_replicas=opt.world_size, rank=opt.rank ) if test_dataset is not None: test_sampler = torch.utils.data.distributed.DistributedSampler( test_dataset, num_replicas=opt.world_size, rank=opt.rank ) else: test_sampler = None else: train_sampler = None test_sampler = None train_dataloader = torch.utils.data.DataLoader(train_dataset, batch_size=opt.bs,sampler=train_sampler, shuffle=train_sampler is None, num_workers=int(opt.workers), drop_last=True) if test_dataset is not None: test_dataloader = torch.utils.data.DataLoader(train_dataset, batch_size=opt.bs,sampler=test_sampler, shuffle=False, num_workers=int(opt.workers), drop_last=False) else: test_dataloader = None return train_dataloader, test_dataloader, train_sampler, test_sampler def train(gpu, opt, output_dir, noises_init): set_seed(opt) logger = setup_logging(output_dir) if opt.distribution_type == 'multi': should_diag = gpu==0 else: should_diag = True if should_diag: outf_syn, = setup_output_subdirs(output_dir, 'syn') if opt.distribution_type == 'multi': if opt.dist_url == "env://" and opt.rank == -1: opt.rank = int(os.environ["RANK"]) base_rank = opt.rank * opt.ngpus_per_node opt.rank = base_rank + gpu dist.init_process_group(backend=opt.dist_backend, init_method=opt.dist_url, world_size=opt.world_size, rank=opt.rank) opt.bs = int(opt.bs / opt.ngpus_per_node) opt.workers = 0 opt.saveIter = int(opt.saveIter / opt.ngpus_per_node) opt.diagIter = int(opt.diagIter / opt.ngpus_per_node) opt.vizIter = int(opt.vizIter / opt.ngpus_per_node) ''' data ''' train_dataset, _ = get_dataset(opt.dataroot, opt.npoints, opt.category) dataloader, _, train_sampler, _ = get_dataloader(opt, train_dataset, None) ''' create networks ''' betas = get_betas(opt.schedule_type, opt.beta_start, opt.beta_end, opt.time_num) model = Model(opt, betas, opt.loss_type, opt.model_mean_type, opt.model_var_type) if opt.distribution_type == 'multi': # Multiple processes, single GPU per process def _transform_(m): return nn.parallel.DistributedDataParallel( m, device_ids=[gpu], output_device=gpu) torch.cuda.set_device(gpu) model.cuda(gpu) model.multi_gpu_wrapper(_transform_) elif opt.distribution_type == 'single': def _transform_(m): return nn.parallel.DataParallel(m) model = model.cuda() model.multi_gpu_wrapper(_transform_) elif gpu is not None: torch.cuda.set_device(gpu) model = model.cuda(gpu) else: raise ValueError('distribution_type = multi | single | None') if should_diag: logger.info(opt) optimizer= optim.Adam(model.parameters(), lr=opt.lr, weight_decay=opt.decay, betas=(opt.beta1, 0.999)) lr_scheduler = optim.lr_scheduler.ExponentialLR(optimizer, opt.lr_gamma) if opt.model != '': ckpt = torch.load(opt.model) model.load_state_dict(ckpt['model_state']) optimizer.load_state_dict(ckpt['optimizer_state']) if opt.model != '': start_epoch = torch.load(opt.model)['epoch'] + 1 else: start_epoch = 0 def new_x_chain(x, num_chain): return torch.randn(num_chain, *x.shape[1:], device=x.device) for epoch in range(start_epoch, opt.niter): if opt.distribution_type == 'multi': train_sampler.set_epoch(epoch) lr_scheduler.step(epoch) for i, data in enumerate(dataloader): x = data['train_points'].transpose(1,2) noises_batch = noises_init[data['idx']].transpose(1,2) ''' train diffusion ''' if opt.distribution_type == 'multi' or (opt.distribution_type is None and gpu is not None): x = x.cuda(gpu) noises_batch = noises_batch.cuda(gpu) elif opt.distribution_type == 'single': x = x.cuda() noises_batch = noises_batch.cuda() loss = model.get_loss_iter(x, noises_batch).mean() optimizer.zero_grad() loss.backward() netpNorm, netgradNorm = getGradNorm(model) if opt.grad_clip is not None: torch.nn.utils.clip_grad_norm_(model.parameters(), opt.grad_clip) optimizer.step() if i % opt.print_freq == 0 and should_diag: logger.info('[{:>3d}/{:>3d}][{:>3d}/{:>3d}] loss: {:>10.4f}, ' 'netpNorm: {:>10.2f}, netgradNorm: {:>10.2f} ' .format( epoch, opt.niter, i, len(dataloader),loss.item(), netpNorm, netgradNorm, )) if (epoch + 1) % opt.diagIter == 0 and should_diag: logger.info('Diagnosis:') x_range = [x.min().item(), x.max().item()] kl_stats = model.all_kl(x) logger.info(' [{:>3d}/{:>3d}] ' 'x_range: [{:>10.4f}, {:>10.4f}], ' 'total_bpd_b: {:>10.4f}, ' 'terms_bpd: {:>10.4f}, ' 'prior_bpd_b: {:>10.4f} ' 'mse_bt: {:>10.4f} ' .format( epoch, opt.niter, *x_range, kl_stats['total_bpd_b'].item(), kl_stats['terms_bpd'].item(), kl_stats['prior_bpd_b'].item(), kl_stats['mse_bt'].item() )) if (epoch + 1) % opt.vizIter == 0 and should_diag: logger.info('Generation: eval') model.eval() with torch.no_grad(): x_gen_eval = model.gen_samples(new_x_chain(x, 25).shape, x.device, clip_denoised=False) x_gen_list = model.gen_sample_traj(new_x_chain(x, 1).shape, x.device, freq=40, clip_denoised=False) x_gen_all = torch.cat(x_gen_list, dim=0) gen_stats = [x_gen_eval.mean(), x_gen_eval.std()] gen_eval_range = [x_gen_eval.min().item(), x_gen_eval.max().item()] logger.info(' [{:>3d}/{:>3d}] ' 'eval_gen_range: [{:>10.4f}, {:>10.4f}] ' 'eval_gen_stats: [mean={:>10.4f}, std={:>10.4f}] ' .format( epoch, opt.niter, *gen_eval_range, *gen_stats, )) visualize_pointcloud_batch('%s/epoch_%03d_samples_eval.png' % (outf_syn, epoch), x_gen_eval.transpose(1, 2), None, None, None) visualize_pointcloud_batch('%s/epoch_%03d_samples_eval_all.png' % (outf_syn, epoch), x_gen_all.transpose(1, 2), None, None, None) visualize_pointcloud_batch('%s/epoch_%03d_x.png' % (outf_syn, epoch), x.transpose(1, 2), None, None, None) logger.info('Generation: train') model.train() if (epoch + 1) % opt.saveIter == 0: if should_diag: save_dict = { 'epoch': epoch, 'model_state': model.state_dict(), 'optimizer_state': optimizer.state_dict() } torch.save(save_dict, '%s/epoch_%d.pth' % (output_dir, epoch)) if opt.distribution_type == 'multi': dist.barrier() map_location = {'cuda:%d' % 0: 'cuda:%d' % gpu} model.load_state_dict( torch.load('%s/epoch_%d.pth' % (output_dir, epoch), map_location=map_location)['model_state']) dist.destroy_process_group() def main(): opt = parse_args() if opt.category == 'airplane': opt.beta_start = 1e-5 opt.beta_end = 0.008 opt.schedule_type = 'warm0.1' exp_id = os.path.splitext(os.path.basename(__file__))[0] dir_id = os.path.dirname(__file__) output_dir = get_output_dir(dir_id, exp_id) copy_source(__file__, output_dir) ''' workaround ''' train_dataset, _ = get_dataset(opt.dataroot, opt.npoints, opt.category) noises_init = torch.randn(len(train_dataset), opt.npoints, opt.nc) if opt.dist_url == "env://" and opt.world_size == -1: opt.world_size = int(os.environ["WORLD_SIZE"]) if opt.distribution_type == 'multi': opt.ngpus_per_node = torch.cuda.device_count() opt.world_size = opt.ngpus_per_node * opt.world_size mp.spawn(train, nprocs=opt.ngpus_per_node, args=(opt, output_dir, noises_init)) else: train(opt.gpu, opt, output_dir, noises_init) def parse_args(): parser = argparse.ArgumentParser() parser.add_argument('--dataroot', default='/viscam/u/alexzhou907/01DATA/shapenet/ShapeNetCore.v2.PC15k', help='input batch size') parser.add_argument('--category', default='chair') parser.add_argument('--bs', type=int, default=48, help='input batch size') parser.add_argument('--workers', type=int, default=16, help='workers') parser.add_argument('--niter', type=int, default=10000, help='number of epochs to train for') parser.add_argument('--nc', default=3) parser.add_argument('--npoints', default=2048) '''model''' parser.add_argument('--beta_start', default=0.0001) parser.add_argument('--beta_end', default=0.02) parser.add_argument('--schedule_type', default='linear') parser.add_argument('--time_num', default=1000) #params parser.add_argument('--attention', default=True) parser.add_argument('--dropout', default=0.1) parser.add_argument('--embed_dim', type=int, default=64) parser.add_argument('--loss_type', default='mse') parser.add_argument('--model_mean_type', default='eps') parser.add_argument('--model_var_type', default='fixedsmall') parser.add_argument('--lr', type=float, default=2e-4, help='learning rate for E, default=0.0002') parser.add_argument('--beta1', type=float, default=0.5, help='beta1 for adam. default=0.5') parser.add_argument('--decay', type=float, default=0, help='weight decay for EBM') parser.add_argument('--grad_clip', type=float, default=None, help='weight decay for EBM') parser.add_argument('--lr_gamma', type=float, default=0.998, help='lr decay for EBM') parser.add_argument('--model', default='', help="path to model (to continue training)") '''distributed''' parser.add_argument('--world_size', default=1, type=int, help='Number of distributed nodes.') parser.add_argument('--dist_url', default='tcp://127.0.0.1:9991', type=str, help='url used to set up distributed training') parser.add_argument('--dist_backend', default='nccl', type=str, help='distributed backend') parser.add_argument('--distribution_type', default='single', choices=['multi', 'single', None], help='Use multi-processing distributed training to launch ' 'N processes per node, which has N GPUs. This is the ' 'fastest way to use PyTorch for either single node or ' 'multi node data parallel training') parser.add_argument('--rank', default=0, type=int, help='node rank for distributed training') parser.add_argument('--gpu', default=None, type=int, help='GPU id to use. None means using all available GPUs.') '''eval''' parser.add_argument('--saveIter', default=100, help='unit: epoch') parser.add_argument('--diagIter', default=50, help='unit: epoch') parser.add_argument('--vizIter', default=50, help='unit: epoch') parser.add_argument('--print_freq', default=50, help='unit: iter') parser.add_argument('--manualSeed', default=42, type=int, help='random seed') opt = parser.parse_args() return opt if __name__ == '__main__': main()