fix bug and add test

llmfoundry/callbacks/hf_checkpointer.py

@@ -8,9 +8,10 @@
 import tempfile
 from pathlib import Path
 from typing import Optional, Union
+import math
 
 import torch
-from composer.core import Callback, Event, State, Time
+from composer.core import Callback, Event, State, Time, TimeUnit
 from composer.core.state import fsdp_state_dict_type_context
 from composer.loggers import Logger, MLFlowLogger
 from composer.loggers.remote_uploader_downloader import RemoteUploaderDownloader
@@ -83,6 +84,13 @@ def __init__(
 
         self.huggingface_folder_name_fstr = os.path.join(
             'huggingface', huggingface_folder_name)
+
+        if isinstance(save_interval, str):
+            save_interval = Time.from_timestring(save_interval)
+        if isinstance(save_interval, int):
+            save_interval = Time(save_interval, TimeUnit.EPOCH)
+
+        self.save_interval = save_interval
         self.check_interval = create_interval_scheduler(
             save_interval, include_end_of_training=True)
         self.upload_to_object_store = (self.backend != '')
@@ -225,7 +233,13 @@ def _save_checkpoint(self, state: State, logger: Logger):
                         )
 
                 elapsed_duration = state.get_elapsed_duration()
-                if self.mlflow_registered_model_name is not None and elapsed_duration is not None and elapsed_duration >= 1.0:
+
+                # If the save interval is specified as 1dur, and the max duration is in epoch units
+                # we need a special case to identify we are on the last batch and should write the mlflow checkpoint
+                is_last_batch = False
+                if self.save_interval.unit == TimeUnit.DURATION and self.save_interval.value == 1 and state.max_duration.unit == TimeUnit.EPOCH:
+                    is_last_batch = int(state.timestamp.batch) % math.ceil(state.max_duration.value * state.dataloader_len) == 0
+                if self.mlflow_registered_model_name is not None and ((elapsed_duration is not None and elapsed_duration >= 1.0) or is_last_batch):
                     components = {'model': new_model_instance}
                     if original_tokenizer is not None:
                         components['tokenizer'] = original_tokenizer

tests/test_hf_conversion_script.py

@@ -251,25 +251,29 @@ def test_callback_inits_with_defaults():
 @pytest.mark.parametrize('model', ['mpt', 'neo', 'llama2'])
 @pytest.mark.parametrize('fsdp_state_dict_type', ['full', 'sharded', None])
 @pytest.mark.parametrize('log_to_mlflow', [True, False])
+@pytest.mark.parametrize('hf_save_interval,save_interval,max_duration,expected_hf_checkpoints,expected_normal_checkpoints', [('3ba', '2ba', '7ba', 3, 4), ('1dur', '2ba', '1ep', 1, 4)])
 def test_huggingface_conversion_callback(model: str, tmp_path: pathlib.Path,
                                          fsdp_state_dict_type: Optional[str],
-                                         log_to_mlflow: bool):
+                                         log_to_mlflow: bool,
+                                         hf_save_interval: str,
+                                         save_interval: str,
+                                         max_duration: str,
+                                         expected_hf_checkpoints: int,
+                                         expected_normal_checkpoints: int):
     delete_transformers_cache()
 
     dist.initialize_dist(get_device('gpu'))
 
     max_seq_len = 16
-    save_interval_batches = 2
-    huggingface_save_interval_batches = 3
     device_batch_size = 1
     dataset_size = 14
-    max_duration_batches = 7
     precision_str = 'bfloat16'
     precision = torch.bfloat16
+    batches_per_epoch = math.ceil(dataset_size / (device_batch_size*2))
 
     checkpointer_callback = HuggingFaceCheckpointer(
         save_folder=os.path.join(tmp_path, 'checkpoints'),
-        save_interval=f'{huggingface_save_interval_batches}ba',
+        save_interval=hf_save_interval,
         precision=precision_str,
         mlflow_registered_model_name='dummy-registered-name'
         if log_to_mlflow else None,
@@ -405,8 +409,8 @@ def test_huggingface_conversion_callback(model: str, tmp_path: pathlib.Path,
         fsdp_config=fsdp_config if fsdp_state_dict_type is not None else None,
         train_dataloader=train_dataloader,
         save_folder=os.path.join(tmp_path, 'checkpoints'),
-        save_interval=f'{save_interval_batches}ba',
-        max_duration=f'{max_duration_batches}ba',
+        save_interval=save_interval,
+        max_duration=max_duration,
         callbacks=[checkpointer_callback],
         loggers=[mlflow_logger_mock] if log_to_mlflow else [],
         optimizers=optimizer,
@@ -442,15 +446,13 @@ def test_huggingface_conversion_callback(model: str, tmp_path: pathlib.Path,
                 name for name in os.listdir(
                     os.path.join(tmp_path, 'checkpoints', 'huggingface'))
             ]
-            assert len(normal_checkpoints) == math.ceil(max_duration_batches /
-                                                        save_interval_batches)
-            assert len(huggingface_checkpoints) == math.ceil(
-                max_duration_batches / huggingface_save_interval_batches)
+            assert len(normal_checkpoints) == expected_normal_checkpoints
+            assert len(huggingface_checkpoints) == expected_hf_checkpoints
 
             # Load the last huggingface checkpoint
             loaded_model = transformers.AutoModelForCausalLM.from_pretrained(
                 os.path.join(tmp_path, 'checkpoints', 'huggingface',
-                             f'ba{max_duration_batches}'),
+                             f'ba{batches_per_epoch}'),
                 trust_remote_code=True,
             )
 
@@ -471,7 +473,7 @@ def test_huggingface_conversion_callback(model: str, tmp_path: pathlib.Path,
 
             loaded_tokenizer = transformers.AutoTokenizer.from_pretrained(
                 os.path.join(tmp_path, 'checkpoints', 'huggingface',
-                             f'ba{max_duration_batches}'),
+                             f'ba{batches_per_epoch}'),
                 trust_remote_code=True,
             )