Synchronize ranks for DDP
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Anthony Mercurio
GitHub
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4572617ff9
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7102d313ac
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@ -78,7 +78,7 @@ parser.add_argument('--shuffle', dest='shuffle', type=bool_t, default='True', he
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parser.add_argument('--hf_token', type=str, default=None, required=False, help='A HuggingFace token is needed to download private models for training.')
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parser.add_argument('--project_id', type=str, default='diffusers', help='Project ID for reporting to WandB')
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parser.add_argument('--fp16', dest='fp16', type=bool_t, default='False', help='Train in mixed precision')
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parser.add_argument('--image_log_steps', type=int, default=100, help='Number of steps to log images at.')
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parser.add_argument('--image_log_steps', type=int, default=500, help='Number of steps to log images at.')
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parser.add_argument('--image_log_amount', type=int, default=4, help='Number of images to log every image_log_steps')
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parser.add_argument('--image_log_inference_steps', type=int, default=50, help='Number of inference steps to use to log images.')
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parser.add_argument('--image_log_scheduler', type=str, default="PNDMScheduler", help='Number of inference steps to use to log images.')
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@ -691,6 +691,13 @@ def main():
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unet = unet.to(device, dtype=torch.float32)
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text_encoder = text_encoder.to(device, dtype=weight_dtype)
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unet = torch.nn.parallel.DistributedDataParallel(
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unet,
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device_ids=[rank],
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output_device=rank,
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gradient_as_bucket_view=True
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)
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if args.use_8bit_adam: # Bits and bytes is only supported on certain CUDA setups, so default to regular adam if it fails.
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try:
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import bitsandbytes as bnb
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@ -701,6 +708,7 @@ def main():
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else:
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optimizer_cls = torch.optim.AdamW
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"""
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optimizer = optimizer_cls(
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unet.parameters(),
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lr=args.lr,
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@ -708,13 +716,25 @@ def main():
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eps=args.adam_epsilon,
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weight_decay=args.adam_weight_decay,
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)
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"""
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noise_scheduler = DDPMScheduler(
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beta_start=0.00085,
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beta_end=0.012,
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beta_schedule='scaled_linear',
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num_train_timesteps=1000,
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clip_sample=False
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# Create distributed optimizer
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from torch.distributed.optim import ZeroRedundancyOptimizer
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optimizer = ZeroRedundancyOptimizer(
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unet.parameters(),
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optimizer_class=optimizer_cls,
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parameters_as_bucket_view=True,
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lr=args.lr,
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betas=(args.adam_beta1, args.adam_beta2),
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eps=args.adam_epsilon,
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weight_decay=args.adam_weight_decay,
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)
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noise_scheduler = DDPMScheduler.from_pretrained(
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args.model,
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subfolder='scheduler',
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use_auth_token=args.hf_token,
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)
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# load dataset
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@ -743,8 +763,6 @@ def main():
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print(f"Completed resize and migration to '{args.dataset}_cropped' please relaunch the trainer without the --resize argument and train on the migrated dataset.")
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exit(0)
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unet = torch.nn.parallel.DistributedDataParallel(unet, device_ids=[rank], output_device=rank, gradient_as_bucket_view=True)
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# create ema
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if args.use_ema:
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ema_unet = EMAModel(unet.parameters())
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@ -786,8 +804,6 @@ def main():
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if args.use_ema:
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ema_unet.restore(unet.parameters())
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# barrier
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torch.distributed.barrier()
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# train!
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try:
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@ -823,10 +839,6 @@ def main():
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else:
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encoder_hidden_states = encoder_hidden_states.last_hidden_state
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# Predict the noise residual and compute loss
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with torch.autocast('cuda', enabled=args.fp16):
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noise_pred = unet.module(noisy_latents, timesteps, encoder_hidden_states).sample
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if noise_scheduler.config.prediction_type == "epsilon":
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target = noise
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elif noise_scheduler.config.prediction_type == "v_prediction":
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@ -834,15 +846,20 @@ def main():
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else:
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raise ValueError(f"Unknown prediction type: {noise_scheduler.config.prediction_type}")
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loss = torch.nn.functional.mse_loss(noise_pred.float(), target.float(), reduction="mean")
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with unet.join():
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# Predict the noise residual and compute loss
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with torch.autocast('cuda', enabled=args.fp16):
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noise_pred = unet(noisy_latents, timesteps, encoder_hidden_states).sample
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# backprop and update
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scaler.scale(loss).backward()
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torch.nn.utils.clip_grad_norm_(unet.parameters(), 1.0)
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scaler.step(optimizer)
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scaler.update()
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lr_scheduler.step()
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optimizer.zero_grad()
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loss = torch.nn.functional.mse_loss(noise_pred.float(), target.float(), reduction="mean")
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# backprop and update
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scaler.scale(loss).backward()
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torch.nn.utils.clip_grad_norm_(unet.parameters(), 1.0)
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scaler.step(optimizer)
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scaler.update()
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lr_scheduler.step()
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optimizer.zero_grad()
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# Update EMA
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if args.use_ema:
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@ -875,11 +892,10 @@ def main():
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progress_bar.set_postfix(logs)
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run.log(logs, step=global_step)
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if global_step % args.save_steps == 0:
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if global_step % args.save_steps == 0 and global_step > 0:
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save_checkpoint(global_step)
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if args.enableinference:
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if global_step % args.image_log_steps == 0:
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if global_step % args.image_log_steps == 0 and global_step > 0:
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if rank == 0:
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# get prompt from random batch
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prompt = tokenizer.decode(batch['input_ids'][random.randint(0, len(batch['input_ids'])-1)].tolist())
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@ -935,7 +951,6 @@ def main():
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# cleanup so we don't run out of memory
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del pipeline
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gc.collect()
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torch.distributed.barrier()
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except Exception as e:
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print(f'Exception caught on rank {rank} at step {global_step}, saving checkpoint...\n{e}\n{traceback.format_exc()}')
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pass
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