Torchao weights only compability

src/transformers/quantizers/quantizer_torchao.py

@@ -73,6 +73,50 @@ def validate_environment(self, *args, **kwargs):
                     )
                 else:
                     self.offload = True
+        if self.pre_quantized:
+            safe_globals = []
+            if self.quantization_config.quant_type == "int4_weight_only":
+                from torchao.dtypes.affine_quantized_tensor import (
+                    AffineQuantizedTensor,
+                    TensorCoreTiledAQTLayout,
+                    TensorCoreTiledLayoutType,
+                    ZeroPointDomain,
+                )
+
+                safe_globals += [
+                    AffineQuantizedTensor,
+                    TensorCoreTiledAQTLayout,
+                    TensorCoreTiledLayoutType,
+                    ZeroPointDomain,
+                ]
+            elif self.quantization_config.quant_type == "int8_weight_only":
+                from torchao.dtypes.affine_quantized_tensor import (
+                    AffineQuantizedTensor,
+                    PlainAQTLayout,
+                    PlainLayoutType,
+                    ZeroPointDomain,
+                )
+
+                safe_globals += [PlainAQTLayout, AffineQuantizedTensor, PlainLayoutType, ZeroPointDomain]
+            elif self.quantization_config.quant_type == "int8_dynamic_activation_int8_weight":
+                from torchao.dtypes.affine_quantized_tensor import (
+                    AffineQuantizedTensor,
+                    PlainAQTLayout,
+                    PlainLayoutType,
+                    ZeroPointDomain,
+                )
+                from torchao.quantization.linear_activation_quantized_tensor import LinearActivationQuantizedTensor
+                from torchao.quantization.quant_api import _int8_symm_per_token_reduced_range_quant
+
+                safe_globals += [
+                    LinearActivationQuantizedTensor,
+                    AffineQuantizedTensor,
+                    PlainAQTLayout,
+                    PlainLayoutType,
+                    ZeroPointDomain,
+                    _int8_symm_per_token_reduced_range_quant,
+                ]
+            torch.serialization.add_safe_globals(safe_globals)
 
     def update_torch_dtype(self, torch_dtype):
         if self.quantization_config.quant_type == "int4_weight_only":
@@ -85,6 +129,10 @@ def update_torch_dtype(self, torch_dtype):
                     "Setting torch_dtype to torch.bfloat16 for int4_weight_only quantization since only bfloat16 is supported right now. Please set torch_dtype=torch.bfloat16 to remove this warning."
                 )
                 torch_dtype = torch.bfloat16
+        if self.quantization_config.quant_type == "int8_dynamic_activation_int8_weight":
+            if torch_dtype is None:
+                # we need to set the torch_dtype, otherwise we have dtype mismatch when performing the quantized linear op
+                torch_dtype = torch.float32
         return torch_dtype
 
     def adjust_target_dtype(self, target_dtype: "torch.dtype") -> "torch.dtype":
@@ -172,6 +220,12 @@ def is_serializable(self, safe_serialization=None):
         )
         if not _is_torchao_serializable:
             logger.warning("torchao quantized model is only serializable after huggingface_hub >= 0.25.0 ")
+        if self.offload and self.quantization_config.modules_to_not_convert is None:
+            logger.warning(
+                "The model contains offloaded modules and these modules are not quantized. We don't recommend saving the model as we won't be able to reload them."
+                "If you want to specify modules to not quantize, please specify modules_to_not_convert in the quantization_config."
+            )
+            return False
         return _is_torchao_serializable
 
     @property

tests/quantization/torchao_integration/test_torchao.py

@@ -14,6 +14,7 @@
 # limitations under the License.
 
 import gc
+import tempfile
 import unittest
 
 from transformers import AutoModelForCausalLM, AutoTokenizer, TorchAoConfig
@@ -209,5 +210,60 @@ def test_int4wo_offload(self):
         self.assertEqual(tokenizer.decode(output[0], skip_special_tokens=True), EXPECTED_OUTPUT)
 
 
+@require_torch_gpu
+@require_torchao
+class TorchAoSerializationTest(unittest.TestCase):
+    input_text = "What are we having for dinner?"
+    max_new_tokens = 10
+    EXPECTED_OUTPUT = "What are we having for dinner?\n- 1. What is the temperature outside"
+    model_name = "TinyLlama/TinyLlama-1.1B-Chat-v1.0"
+    quant_config = TorchAoConfig("int4_weight_only", group_size=32)
+
+    # called only once for all test in this class
+    @classmethod
+    def setUpClass(cls):
+        cls.quantized_model = AutoModelForCausalLM.from_pretrained(
+            cls.model_name,
+            torch_dtype=torch.bfloat16,
+            device_map="cuda:0",
+            quantization_config=cls.quant_config,
+        )
+        cls.tokenizer = AutoTokenizer.from_pretrained(cls.model_name)
+
+    def tearDown(self):
+        gc.collect()
+        torch.cuda.empty_cache()
+        gc.collect()
+
+    def test_original_model_expected_output(self):
+        input_ids = self.tokenizer(self.input_text, return_tensors="pt").to(torch_device)
+        output = self.quantized_model.generate(**input_ids, max_new_tokens=self.max_new_tokens)
+
+        self.assertEqual(self.tokenizer.decode(output[0], skip_special_tokens=True), self.EXPECTED_OUTPUT)
+
+    def test_serialization_weight_only(self):
+        with tempfile.TemporaryDirectory() as tmpdirname:
+            self.quantized_model.save_pretrained(tmpdirname, safe_serialization=False)
+            loaded_quantized_model = AutoModelForCausalLM.from_pretrained(
+                self.model_name, torch_dtype=torch.bfloat16, device_map="cuda:0"
+            )
+            input_ids = self.tokenizer(self.input_text, return_tensors="pt").to(torch_device)
+
+            output = loaded_quantized_model.generate(**input_ids, max_new_tokens=self.max_new_tokens)
+            # TODO: investigate why we don't have the same output as the original model
+            EXPECTED_OUTPUT = "What are we having for dinner?\n\nJessica: (smiling)"
+            self.assertEqual(self.tokenizer.decode(output[0], skip_special_tokens=True), EXPECTED_OUTPUT)
+
+
+class TorchAoSerializationW8A8Test(TorchAoSerializationTest):
+    quant_config = TorchAoConfig("int8_dynamic_activation_int8_weight")
+    EXPECTED_OUTPUT = "What are we having for dinner?\n\nJessica: (smiling)"
+
+
+class TorchAoSerializationW8Test(TorchAoSerializationTest):
+    quant_config = TorchAoConfig("int8_weight_only")
+    EXPECTED_OUTPUT = "What are we having for dinner?\n\nJessica: (smiling)"
+
+
 if __name__ == "__main__":
     unittest.main()