feat: add support for tensor parallel flow using accelerate

Signed-off-by: Mehant Kammakomati <[email protected]>

Author: kmehant

src/transformers/trainer.py

@@ -233,6 +233,7 @@
         AutocastKwargs,
         DistributedDataParallelKwargs,
         DistributedType,
+        TorchTensorParallelPlugin,
         load_fsdp_model,
         load_fsdp_optimizer,
         save_fsdp_model,
@@ -5076,6 +5077,11 @@ def create_accelerator_and_postprocess(self):
             args["dataloader_config"] = dataloader_config
         else:
             args.update(accelerator_config)
+        # tp is initialized at Accelerator init phase so
+        # args should be prepared here
+        if self.args.tp_size > 1:
+            self.is_tp_enabled = True
+            args["torch_tp_plugin"] = TorchTensorParallelPlugin(tp_size=self.args.tp_size)
 
         # create accelerator object
         self.accelerator = Accelerator(**args)
@@ -5090,7 +5096,7 @@ def create_accelerator_and_postprocess(self):
         # deepspeed and accelerate flags covering both trainer args and accelerate launcher
         self.is_deepspeed_enabled = getattr(self.accelerator.state, "deepspeed_plugin", None) is not None
         self.is_fsdp_enabled = getattr(self.accelerator.state, "fsdp_plugin", None) is not None
-
+        self.is_tp_enabled = getattr(self.accelerator.state, "tp_plugin", None) is not None
         # post accelerator creation setup
         if self.is_fsdp_enabled:
             fsdp_plugin = self.accelerator.state.fsdp_plugin

src/transformers/training_args.py

@@ -566,7 +566,9 @@ class TrainingArguments:
                     Will use gradient checkpointing over each nested XLA FSDP wrapped layer. This setting can only be
                     used when the xla flag is set to true, and an auto wrapping policy is specified through
                     fsdp_min_num_params or fsdp_transformer_layer_cls_to_wrap.
-
+        tp_size (`int`, *optional*):
+            Use tp_size to enable pytorch 2.0 tensor parallelism. Set a value greater than 1 to activate TP. The same is
+            used to prepare device mesh internally.
         deepspeed (`str` or `dict`, *optional*):
             Use [Deepspeed](https://github.com/microsoft/deepspeed). This is an experimental feature and its API may
             evolve in the future. The value is either the location of DeepSpeed json config file (e.g.,
@@ -1240,6 +1242,16 @@ class TrainingArguments:
             )
         },
     )
+    tp_size: Optional[int] = field(
+        default=0,
+        metadata={
+            "help": (
+                "Use tp_size to enable pytorch 2.0 tensor parallelism."
+                "Set a value greater than 1 to activate TP."
+                "The same is used to prepare device mesh internally."
+            )
+        },
+    )
     fsdp_transformer_layer_cls_to_wrap: Optional[str] = field(
         default=None,
         metadata={
@@ -1957,6 +1969,8 @@ def __post_init__(self):
             if self.fsdp_config["xla_fsdp_grad_ckpt"]:
                 warnings.warn("`--xla_fsdp_grad_ckpt` is useful only when `--xla` is set to true.")
 
+        if self.tp_size > 1:
+            os.environ["ACCELERATE_USE_TP"] = "true"
         # accelerate integration for FSDP
         if len(self.fsdp) > 0 and not self.fsdp_config["xla"]:
             os.environ["ACCELERATE_USE_FSDP"] = "true"