AdamW is now supported by default (#9624)

docs/source/main_classes/trainer.rst

@@ -655,7 +655,6 @@ enables FP16, uses AdamW optimizer and WarmupLR scheduler:
            "weight_decay": 3e-7
          }
        },
-       "zero_allow_untested_optimizer": true,
 
        "scheduler": {
          "type": "WarmupLR",
@@ -766,8 +765,8 @@ Optimizer
 =======================================================================================================================
 
 
-DeepSpeed's main optimizers are Adam, OneBitAdam, and Lamb. These have been thoroughly tested with ZeRO and are thus
-recommended to be used. It, however, can import other optimizers from ``torch``. The full documentation is `here
+DeepSpeed's main optimizers are Adam, AdamW, OneBitAdam, and Lamb. These have been thoroughly tested with ZeRO and are
+thus recommended to be used. It, however, can import other optimizers from ``torch``. The full documentation is `here
 <https://www.deepspeed.ai/docs/config-json/#optimizer-parameters>`__.
 
 If you don't configure the ``optimizer`` entry in the configuration file, the :class:`~transformers.Trainer` will
@@ -779,7 +778,6 @@ Here is an example of the pre-configured ``optimizer`` entry for AdamW:
 .. code-block:: json
 
     {
-       "zero_allow_untested_optimizer": true,
        "optimizer": {
            "type": "AdamW",
            "params": {
@@ -791,8 +789,8 @@ Here is an example of the pre-configured ``optimizer`` entry for AdamW:
          }
     }
 
-Since AdamW isn't on the list of tested with DeepSpeed/ZeRO optimizers, we have to add
-``zero_allow_untested_optimizer`` flag.
+If you want to use another optimizer which is not listed above, you will have to add ``"zero_allow_untested_optimizer":
+true`` to the top level configuration.
 
 If you want to use one of the officially supported optimizers, configure them explicitly in the configuration file, and
 make sure to adjust the values. e.g. if use Adam you will want ``weight_decay`` around ``0.01``.

examples/tests/deepspeed/ds_config.json

@@ -19,8 +19,6 @@
         "cpu_offload": true
     },
 
-    "zero_allow_untested_optimizer": true,
-
     "optimizer": {
         "type": "AdamW",
         "params": {

src/transformers/integrations.py

@@ -26,6 +26,7 @@ from types import SimpleNamespace
 
 from .trainer_utils import SchedulerType
 from .utils import logging
+from .utils.versions import require_version
 
 
 logger = logging.get_logger(__name__)
@@ -281,6 +282,8 @@ def init_deepspeed(trainer, num_training_steps):
     """
     import deepspeed
 
+    require_version("deepspeed>0.3.10")
+
     args = trainer.args
     ds_config_file = args.deepspeed
     model = trainer.model
@@ -323,9 +326,8 @@ def init_deepspeed(trainer, num_training_steps):
             f"Keeping the `optimizer` config from {ds_config_file} intact, ignoring any optimizer-specific cl args"
         )
     else:  # override only if the ds config doesn't already have this section
-        # ds supports Adam, OneBitAdam, and Lamb optimizers and can import other optimizers from torch.
-        # But trainer uses AdamW by default.
-        # To use other optimizers so using a different scheduler requires voiding warranty with: `zero_allow_untested_optimizer`
+        # ds supports Adam, AdamW, OneBitAdam, and Lamb optimizers and can import other optimizers from torch.
+        # To use other optimizers requires voiding warranty with: `"zero_allow_untested_optimizer": true"`
 
         optimizer_configs = {
             "AdamW": {
@@ -337,7 +339,6 @@ def init_deepspeed(trainer, num_training_steps):
         }
         optimizer = "AdamW"
 
-        config["zero_allow_untested_optimizer"] = True
         config["optimizer"] = {
             "type": optimizer,
             "params": optimizer_configs[optimizer],