From 957a2a46e7725184776c3c72860e8215164cc4ef Mon Sep 17 00:00:00 2001
From: Jordan Gong <jordan.gong@protonmail.com>
Date: Sat, 13 Aug 2022 23:38:43 +0800
Subject: Implement distributed data parallel via torch elastic launcher

---
 simclr/main.py | 67 +++++++++++++++++++++++++++++++++++-----------------------
 1 file changed, 41 insertions(+), 26 deletions(-)

(limited to 'simclr/main.py')

diff --git a/simclr/main.py b/simclr/main.py
index 69e2ab2..3456d41 100644
--- a/simclr/main.py
+++ b/simclr/main.py
@@ -1,11 +1,12 @@
 import argparse
 import os
-import sys
 from dataclasses import dataclass
 from pathlib import Path
 from typing import Iterable, Callable
 
+import sys
 import torch
+import torch.distributed as dist
 import yaml
 from torch.utils.data import Dataset
 from torchvision.datasets import CIFAR10, CIFAR100, ImageNet
@@ -17,8 +18,7 @@ sys.path.insert(0, path)
 from libs.criteria import InfoNCELoss
 from libs.datautils import color_distortion, Clip, RandomGaussianBlur, TwinTransform
 from libs.optimizers import LARS
-from libs.schedulers import LinearWarmupAndCosineAnneal, LinearLR
-from libs.utils import Trainer, BaseConfig
+from libs.utils import Trainer, BaseConfig, elastic_launch
 from libs.logging import BaseBatchLogRecord, Loggers
 from simclr.models import CIFARSimCLRResNet50, ImageNetSimCLRResNet50
 
@@ -254,11 +254,12 @@ class SimCLRTrainer(Trainer):
         self.optims = {n: LARS(o) if config.optim_config.optim == 'lars' else o
                        for n, o in self.optims.items()}
 
-    def train(self, num_iters: int, loss_fn: Callable, logger: Loggers, device: torch.device):
+    def train(self, num_iters: int, loss_fn: Callable, logger: Loggers, device: int):
         model = self.models['model']
         optim = self.optims['model_optim']
         sched = self.scheds['model_optim_sched']
         train_loader = iter(self.train_loader)
+
         model.train()
         for iter_ in range(self.restore_iter, num_iters):
             input_, _ = next(train_loader)
@@ -268,28 +269,37 @@ class SimCLRTrainer(Trainer):
             train_loss, train_accuracy = loss_fn(output)
             train_loss.backward()
             optim.step()
-            self.log(logger, self.BatchLogRecord(
-                iter_, num_iters, iter_, iter_, num_iters,
-                optim.param_groups[0]['lr'],
-                train_loss.item(), train_accuracy.item(),
-                eval_loss=None, eval_accuracy=None,
-            ))
-            if (iter_ + 1) % (num_iters // 100) == 0:
-                metrics = torch.Tensor(list(self.eval(loss_fn, device))).mean(0)
-                eval_loss = metrics[0].item()
-                eval_accuracy = metrics[1].item()
-                eval_log = self.BatchLogRecord(
+
+            if logger is not None:
+                self.log(logger, self.BatchLogRecord(
                     iter_, num_iters, iter_, iter_, num_iters,
-                    lr=None, train_loss=None, train_accuracy=None,
-                    eval_loss=eval_loss, eval_accuracy=eval_accuracy,
-                )
-                self.log(logger, eval_log)
-                self.save_checkpoint(eval_log)
+                    optim.param_groups[0]['lr'],
+                    train_loss.item(), train_accuracy.item(),
+                    eval_loss=None, eval_accuracy=None,
+                ))
+            dist.barrier()
+
+            if (iter_ + 1) % (num_iters // 100) == 0:
+                # TODO Gather results from other workers
+                metrics = torch.Tensor(list(self.eval(loss_fn, device)))
+                if logger is not None:
+                    metrics_mean = metrics.mean(0)
+                    eval_loss = metrics_mean[0].item()
+                    eval_accuracy = metrics_mean[1].item()
+                    eval_log = self.BatchLogRecord(
+                        iter_, num_iters, iter_, iter_, num_iters,
+                        lr=None, train_loss=None, train_accuracy=None,
+                        eval_loss=eval_loss, eval_accuracy=eval_accuracy,
+                    )
+                    self.log(logger, eval_log)
+                    self.save_checkpoint(eval_log)
                 model.train()
+            dist.barrier()
+
             if sched is not None:
                 sched.step()
 
-    def eval(self, loss_fn: Callable, device: torch.device):
+    def eval(self, loss_fn: Callable, device: int):
         model = self.models['model']
         model.eval()
         with torch.no_grad():
@@ -300,14 +310,13 @@ class SimCLRTrainer(Trainer):
                 yield loss.item(), accuracy.item()
 
 
-if __name__ == '__main__':
+def main(local_rank, global_rank):
     args = parse_args_and_config()
     config = SimCLRConfig.from_args(args)
-    device = torch.device('cuda' if torch.cuda.is_available() else 'cpu')
     trainer = SimCLRTrainer(
         seed=args.seed,
         checkpoint_dir=args.checkpoint_dir,
-        device=device,
+        device=local_rank,
         inf_mode=True,
         num_iters=args.num_iters,
         config=config,
@@ -315,5 +324,11 @@ if __name__ == '__main__':
         out_dim=args.out_dim,
     )
 
-    loggers = trainer.init_logger(args.log_dir)
-    trainer.train(args.num_iters, InfoNCELoss(args.temp), loggers, device)
+    loggers = None
+    if global_rank == 0:
+        loggers = trainer.init_logger(args.log_dir)
+    trainer.train(args.num_iters, InfoNCELoss(args.temp), loggers, local_rank)
+
+
+if __name__ == '__main__':
+    elastic_launch(main)
-- 
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