Merge pull request #755 from mlcommons/juhan/ddp_fix2

Allow DDP checkpointing

Author: priyakasimbeg

algorithmic_efficiency/checkpoint_utils.py

@@ -119,7 +119,9 @@ def maybe_restore_checkpoint(framework: str,
 
   else:
     checkpoint_state = latest_ckpt
-    if isinstance(model_params, torch.nn.DataParallel):
+    if isinstance(
+        model_params,
+        (torch.nn.DataParallel, torch.nn.parallel.DistributedDataParallel)):
       model_params = model_params.module
     model_params.load_state_dict(checkpoint_state['model_params'])
     checkpoint_state['model_params'] = model_params
@@ -196,7 +198,9 @@ def save_checkpoint(framework: str,
     opt_state = jax.device_get(jax_utils.unreplicate(opt_state))
     model_state = jax.device_get(jax_utils.unreplicate(model_state))
   else:
-    if isinstance(model_params, torch.nn.DataParallel):
+    if isinstance(
+        model_params,
+        (torch.nn.DataParallel, torch.nn.parallel.DistributedDataParallel)):
       model_params = model_params.module
     model_params = model_params.state_dict()
     optimizer_state_dict = {}

algorithmic_efficiency/logger_utils.py

@@ -16,6 +16,7 @@
 import GPUtil
 import pandas as pd
 import psutil
+import torch.distributed as dist
 
 from algorithmic_efficiency import spec
 from algorithmic_efficiency.pytorch_utils import pytorch_setup
@@ -43,9 +44,6 @@ def get_log_dir(
     resume_last_run: bool,
     overwrite: bool,
 ) -> Optional[str]:
-  if RANK != 0:
-    return
-
   # Construct path to experiment workload directory.
   experiment_dir = os.path.expanduser(experiment_dir)
   workload_dir_name = f'{workload}_{framework}'
@@ -61,18 +59,25 @@ def get_log_dir(
       logging.info(
           f'Removing existing experiment directory {experiment_path} because '
           '--overwrite was set.')
-      shutil.rmtree(experiment_path)
+      if RANK == 0:
+        shutil.rmtree(experiment_path)
     elif resume_last_run:
       logging.info(
           f'Resuming from experiment directory {experiment_path} because '
           '--resume_last_run was set.')
     else:
-      resume = input(
-          'Found existing experiment dir with the same name: {}. Do you wish '
-          'to resume training from this dir? [y/N]:'.format(experiment_path))
-      if resume.lower() != 'y':
-        sys.exit()
-
+      if RANK == 0:
+        resume = input(
+            'Found existing experiment dir with the same name: {}. Do you wish '
+            'to resume training from this dir? [y/N]:'.format(experiment_path))
+        if resume.lower() != 'y':
+          sys.exit()
+
+  if USE_PYTORCH_DDP:
+    try:
+      dist.barrier()
+    except RuntimeError:
+      sys.exit()
   logging.info(f'Creating experiment directory at {experiment_path}.')
   makedir(experiment_path)
   return experiment_path

submission_runner.py

@@ -316,10 +316,12 @@ def train_once(
     flag_file_name = os.path.join(log_dir, f'flags_{preemption_count}.json')
     logging.info(f'Saving flags to {flag_file_name}.')
     logger_utils.write_json(flag_file_name, flags.FLAGS.flag_values_dict())
-    metrics_logger = logger_utils.set_up_loggers(log_dir,
-                                                 flags.FLAGS,
-                                                 hyperparameters)
-    workload.attach_metrics_logger(metrics_logger)
+    metrics_logger = None
+    if RANK == 0:
+      metrics_logger = logger_utils.set_up_loggers(log_dir,
+                                                   flags.FLAGS,
+                                                   hyperparameters)
+      workload.attach_metrics_logger(metrics_logger)
 
   global_start_time = get_time()
   train_state['last_step_end_time'] = global_start_time
@@ -429,7 +431,7 @@ def train_once(
 
           logging_start_time = get_time()
 
-          if log_dir is not None:
+          if log_dir is not None and RANK == 0:
             metrics_logger.append_scalar_metrics(
                 latest_eval_result,
                 global_step=global_step,
@@ -467,7 +469,7 @@ def train_once(
 
   metrics = {'eval_results': eval_results, 'global_step': global_step}
 
-  if log_dir is not None:
+  if log_dir is not None and RANK == 0:
     metrics_logger.append_scalar_metrics(
         {'score': train_state['accumulated_submission_time']},
         global_step=global_step,