Azure checkpointing support

composer/loggers/remote_uploader_downloader.py

@@ -103,7 +103,7 @@ class RemoteUploaderDownloader(LoggerDestination):
             backend_kwargs={
                 'provider': 's3',
                 'container': 'my-bucket',
-                'provider_kwargs=': {
+                'provider_kwargs': {
                     'key': 'AKIA...',
                     'secret': '*********',
                     'region': 'ap-northeast-1',

composer/utils/checkpoint.py

@@ -641,7 +641,7 @@ def download_checkpoint(path: str,
                 raise FileNotFoundError(
                     (f'Checkpoint {_format_path_with_current_rank(path)} does not exist, '
                      f'but is required for sharded checkpointing on rank {dist.get_global_rank()}. '
-                     'Please ensure that the checkpoint exists and your load_path was specified as a format string'
+                     'Please ensure that the checkpoint exists and your load_path was specified as a format string '
                      'with the {rank} argument.')) from e
 
             if extracted_checkpoint_folder is not None:

composer/utils/file_helpers.py

@@ -21,8 +21,8 @@
 from composer.utils import dist
 from composer.utils.iter_helpers import iterate_with_callback
 from composer.utils.misc import partial_format
-from composer.utils.object_store import (GCSObjectStore, MLFlowObjectStore, ObjectStore, OCIObjectStore, S3ObjectStore,
-                                         UCObjectStore)
+from composer.utils.object_store import (GCSObjectStore, LibcloudObjectStore, MLFlowObjectStore, ObjectStore,
+                                         OCIObjectStore, S3ObjectStore, UCObjectStore)
 from composer.utils.object_store.mlflow_object_store import MLFLOW_DBFS_PATH_PREFIX
 
 if TYPE_CHECKING:
@@ -319,6 +319,7 @@ def parse_uri(uri: str) -> Tuple[str, str, str]:
         Tuple[str, str, str]: A tuple containing the backend (e.g. s3), bucket name, and path.
                               Backend name will be empty string if the input is a local path
     """
+    uri = uri.replace('AZURE_BLOBS', 'azure')  # urlparse does not support _ in scheme
     parse_result = urlparse(uri)
     backend, net_loc, path = parse_result.scheme, parse_result.netloc, parse_result.path
     bucket_name = net_loc if '@' not in net_loc else net_loc.split('@')[0]
@@ -354,6 +355,13 @@ def maybe_create_object_store_from_uri(uri: str) -> Optional[ObjectStore]:
         return GCSObjectStore(bucket=bucket_name)
     elif backend == 'oci':
         return OCIObjectStore(bucket=bucket_name)
+    elif backend == 'azure':
+        return LibcloudObjectStore(
+            provider='AZURE_BLOBS',
+            container=bucket_name,
+            key_environ='AZURE_ACCOUNT_NAME',
+            secret_environ='AZURE_ACCOUNT_ACCESS_KEY',
+        )
     elif backend == 'dbfs':
         if path.startswith(MLFLOW_DBFS_PATH_PREFIX):
             store = None
@@ -411,14 +419,21 @@ def maybe_create_remote_uploader_downloader_from_uri(
             return None
     if backend in ['s3', 'oci', 'gs']:
         return RemoteUploaderDownloader(bucket_uri=f'{backend}://{bucket_name}')
-
+    elif backend == 'azure':
+        return RemoteUploaderDownloader(
+            bucket_uri=f'libcloud://{bucket_name}',
+            backend_kwargs={
+                'provider': 'AZURE_BLOBS',
+                'container': bucket_name,
+                'key_environ': 'AZURE_ACCOUNT_NAME',
+                'secret_environ': 'AZURE_ACCOUNT_ACCESS_KEY',
+            },
+        )
     elif backend == 'dbfs':
         return RemoteUploaderDownloader(bucket_uri=uri, backend_kwargs={'path': path})
-
     elif backend == 'wandb':
         raise NotImplementedError(f'There is no implementation for WandB via URI. Please use '
                                   'WandBLogger with log_artifacts set to True')
-
     else:
         raise NotImplementedError(f'There is no implementation for the cloud backend {backend} via URI. Please use '
                                   'one of the supported RemoteUploaderDownloader object stores')