Skip DeepSpeed ZeRO Stage 3 model initialization when bnb (huggingface#34395)

* Skip DeepSpeed ZeRO Stage 3 model initialization when it is intended to be quantized.

* Propagate the quantization state using a context manager

* make fixup

Author: eljandoubi

src/transformers/modeling_utils.py

@@ -136,6 +136,7 @@
 
 
 _init_weights = True
+_is_quantized = False
 
 
 def is_fsdp_enabled():
@@ -213,6 +214,16 @@ def _skip_init(*args, **kwargs):
                 setattr(torch.nn.init, name, init_func)
 
 
+@contextmanager
+def set_quantized_state():
+    global _is_quantized
+    _is_quantized = True
+    try:
+        yield
+    finally:
+        _is_quantized = False
+
+
 def get_parameter_device(parameter: Union[nn.Module, "ModuleUtilsMixin"]):
     try:
         return next(parameter.parameters()).device
@@ -1531,7 +1542,7 @@ def _from_config(cls, config, **kwargs):
                 torch_dtype=torch_dtype,
             )
 
-        if is_deepspeed_zero3_enabled():
+        if is_deepspeed_zero3_enabled() and not _is_quantized:
             import deepspeed
 
             logger.info("Detected DeepSpeed ZeRO-3: activating zero.init() for this model")
@@ -4086,6 +4097,9 @@ def from_pretrained(
                 )
             init_contexts.append(init_empty_weights())
 
+        if is_deepspeed_zero3_enabled() and is_quantized:
+            init_contexts.append(set_quantized_state())
+
         config = copy.deepcopy(config)  # We do not want to modify the config inplace in from_pretrained.
         if not getattr(config, "_attn_implementation_autoset", False):
             config = cls._autoset_attn_implementation(